ELECTRONIC SCIENCE
ELECTRONIC SCIENCE SYLLABUS
(The syllabus may change from time to time. Please check with the relevant Public Service Commission websites for any changes in the syllabus)
Paper II & Paper III (Part A & Part B) Syllabus
Unit – I: Electronic Transport in semiconductor, PN Junction, Diode equation and diode equivalent circuit. Breakdown in diodes, Zener diodes, Tunnel diode, Semiconductor diodes, characteristics and equivalent circuits of BJT, JFET, MOSFET, IC fabrication-crystal growth, epitaxy, oxidation, lithography, doping, etching, isolation methods, metalization, bonding, Thin film active and passive devices.
Unit-II: Superposition, Thevenin, Norton and Maximum Power Transfer Theorems, Network elements, Network graphs, Nodal and Mesh analysis, Zero and Poles, Bode Plots, Laplace, Fourier and Z – transforms. Time and frequency domain responses. Image impedance and passive filters. Two – port Network Parameters. Transfer functions, Signal representation. State variable method of circuit analysis, AC circuit analysis, Transient analysis.
Unit – III: Rectifiers, Voltage regulated ICs and regulated power supply, Biasing of Bipolar junction transistors and JFET. Single stage amplifiers, Multistage amplifiers, Feedback in amplifiers, oscillators, function generators, multivibrators, Operational Amplifiers (OP AMP) – characteristics and Applications, Computational Applications, Integrator, Differentiator, Wave shaping circuits, F to V and V to F converters. Active filters, Schmitt trigger, Phase locked loop.
Unit – IV: Logic families, flip – flops, Gates, Boolean algebra and minimization techniques, Multivibrators and clock circuits, Counters-Ring, Ripple. Synchronous, Asynchronous, Up and down shift registers, multiplexers and demultiplexers, Arithmetic circuits, Memories, A/D and D/A converters.
Unit – V: Architecture of 8085 and 8086 Microprocessors, Addressing modes, 8085 instruction set, 8085 interrupts, Programming, Memory and I/O interfacing, Interfacing 8155, 8255, 8279, 8253, 8257, 8259, 8251 with 8085 Microprocessors, Serial communication protocols, Introduction of Microcontrollers ( 8 bi t) – 8031 / 8051 and 8048.
Unit – VI: Introduction of High – level Programming Language, Introduction of data in C. Operators and its precedence, Various data types in C, Storage classes in C, Decision-making and forming loop in program, Handling character, Arrays in C, Structure and union, User defined function, Pointers in C, Advanced pointer. Pointer to structures, pointer to functions, Dynamic data structure, file handling in C, Command line argument, Graphics-video modes, video adapters, Drawing various objects on screen, Interfacing to external hardware via serial/parallel port using C, Applying C to electronic circuit problems. Introduction to object-oriented Programming and C++.
Introduction of FORTRAN language, programming discipline, statements to write a program, intrinsic functions, integer-type data, type statement, IF statement, Data validation, Format-directed input and output. Subscripted variables and DO loops. Array, Fortran Subprogram.
Unit – VII: Maxwell’s equations, Time varying fields, Wave equation and its solution, Rectangular waveguide, Propagation of wave in ionosphere, Poynting vector, Antenna parameters, Half-wave antenna, Transmission lines, Characteristic of Impedance matching, Smith chart, Microwave components-T, Magic – T, Tuner. Circulator isolator, Direction couplers, Sources-Reflex Klystron, Principle of operation of Magnetron, Solid State Microwave devices; Basic Theory of Gunn, GaAs FET, Crystal Defector and PIN diode for detection of microwaves.
Unit – VIII: Basic principles of amplitude, frequency and phase modulation, Demodulation, Intermediate frequency and principle of superheterodyne receiver, Spectral analysis and signal transmission through linear systems, Random signals and noise, Noise temperature and noise figure. Basic concepts of information theory, Digital modulation and Demodulation; PM, PCM, ASK, FSK, PSK, Time-division Multiplexing, Frequency-Division Multiplexing, Data Communications-Circuits, Codes and Modems. Basic concepts of signal processing and digital filters.
Unit – IX (a): Characteristics of solid state power devices – SCR, Triac, UJT, Triggering circuits, converters, choppers, inverters, converters. AC-regulators, speed control of a.c. and d.c. motors.
Stepper and synchronous motors; Three phase controlled rectifier; Switch mode power supply; Uninterrupted power supply.
Unit – IX (b): Optical sources – LED, Spontaneous emission, Stimulated emission, Semiconductor Diode LASER, Photodeteetors – p – n photodiode. PIN photodiode, Phototransistors, Optocouplers, Solar cells, Display devices, Optical Fibres-Light propagation in fibre, Types of fibre, Characteristic parameters, Modes, Fibre splicing, Fibre optic communication system-coupling to and from the fibre, Modulation, Multiplexing and coding, Repeaters, Bandwidth and Rise time budgets.
Unit – X (a): Transduces – Resistance, Inductance Capacitance, Peizoelectric, Thermoelectric, Hall effect, Photoelectric, Techogenerators, Measurement of displacement, velocity, acceleration, force, torque, strain, speed and sound temperature, pressure, flow, humidity, thickness, pH, position.
Measuring Equipment-Measurement of R, L and C, Bridge and Potentiometers, voltage, current, power, energy, frequency / time, phase, DVMs, DMMs, CRO, Digital storage oscilloscope, Logic probes, Logic State Analyser, Spectrum Analyzer, Recorder, Noise and Interference in instrumentation, Instrumentation amplifiers, Radio Telemetry.
Analytical Instruments – Biomedical instruments – ECG, blood pressure measurements, spectrophotometers, Electron Microscope, X-ray diffractometer.
Unit – X (b): Open – loop and close-loop control system. Error amplifier, on – off controller, Proportional (P), Proportional-Integral (PI), Proportional – Derivative (PD), PID controllers, Dynamic Behaviour of control systems-servomechanism characteristics parameters of control systems-Accuracy, Sensitivity, Disturbances, Transient response, Stability, Rputh-Hurwitz criterion, Bode plots, Nyquist criterion, Controlling speed. Temperature and position using analog / digital control circuits.
Paper II & Paper III (Part A & Part B) Syllabus
Unit – I: Electronic Transport in semiconductor, PN Junction, Diode equation and diode equivalent circuit. Breakdown in diodes, Zener diodes, Tunnel diode, Semiconductor diodes, characteristics and equivalent circuits of BJT, JFET, MOSFET, IC fabrication-crystal growth, epitaxy, oxidation, lithography, doping, etching, isolation methods, metalization, bonding, Thin film active and passive devices.
Unit-II: Superposition, Thevenin, Norton and Maximum Power Transfer Theorems, Network elements, Network graphs, Nodal and Mesh analysis, Zero and Poles, Bode Plots, Laplace, Fourier and Z – transforms. Time and frequency domain responses. Image impedance and passive filters. Two – port Network Parameters. Transfer functions, Signal representation. State variable method of circuit analysis, AC circuit analysis, Transient analysis.
Unit – III: Rectifiers, Voltage regulated ICs and regulated power supply, Biasing of Bipolar junction transistors and JFET. Single stage amplifiers, Multistage amplifiers, Feedback in amplifiers, oscillators, function generators, multivibrators, Operational Amplifiers (OP AMP) – characteristics and Applications, Computational Applications, Integrator, Differentiator, Wave shaping circuits, F to V and V to F converters. Active filters, Schmitt trigger, Phase locked loop.
Unit – IV: Logic families, flip – flops, Gates, Boolean algebra and minimization techniques, Multivibrators and clock circuits, Counters-Ring, Ripple. Synchronous, Asynchronous, Up and down shift registers, multiplexers and demultiplexers, Arithmetic circuits, Memories, A/D and D/A converters.
Unit – V: Architecture of 8085 and 8086 Microprocessors, Addressing modes, 8085 instruction set, 8085 interrupts, Programming, Memory and I/O interfacing, Interfacing 8155, 8255, 8279, 8253, 8257, 8259, 8251 with 8085 Microprocessors, Serial communication protocols, Introduction of Microcontrollers ( 8 bi t) – 8031 / 8051 and 8048.
Unit – VI: Introduction of High – level Programming Language, Introduction of data in C. Operators and its precedence, Various data types in C, Storage classes in C, Decision-making and forming loop in program, Handling character, Arrays in C, Structure and union, User defined function, Pointers in C, Advanced pointer. Pointer to structures, pointer to functions, Dynamic data structure, file handling in C, Command line argument, Graphics-video modes, video adapters, Drawing various objects on screen, Interfacing to external hardware via serial/parallel port using C, Applying C to electronic circuit problems. Introduction to object-oriented Programming and C++.
Introduction of FORTRAN language, programming discipline, statements to write a program, intrinsic functions, integer-type data, type statement, IF statement, Data validation, Format-directed input and output. Subscripted variables and DO loops. Array, Fortran Subprogram.
Unit – VII: Maxwell’s equations, Time varying fields, Wave equation and its solution, Rectangular waveguide, Propagation of wave in ionosphere, Poynting vector, Antenna parameters, Half-wave antenna, Transmission lines, Characteristic of Impedance matching, Smith chart, Microwave components-T, Magic – T, Tuner. Circulator isolator, Direction couplers, Sources-Reflex Klystron, Principle of operation of Magnetron, Solid State Microwave devices; Basic Theory of Gunn, GaAs FET, Crystal Defector and PIN diode for detection of microwaves.
Unit – VIII: Basic principles of amplitude, frequency and phase modulation, Demodulation, Intermediate frequency and principle of superheterodyne receiver, Spectral analysis and signal transmission through linear systems, Random signals and noise, Noise temperature and noise figure. Basic concepts of information theory, Digital modulation and Demodulation; PM, PCM, ASK, FSK, PSK, Time-division Multiplexing, Frequency-Division Multiplexing, Data Communications-Circuits, Codes and Modems. Basic concepts of signal processing and digital filters.
Unit – IX (a): Characteristics of solid state power devices – SCR, Triac, UJT, Triggering circuits, converters, choppers, inverters, converters. AC-regulators, speed control of a.c. and d.c. motors.
Stepper and synchronous motors; Three phase controlled rectifier; Switch mode power supply; Uninterrupted power supply.
Unit – IX (b): Optical sources – LED, Spontaneous emission, Stimulated emission, Semiconductor Diode LASER, Photodeteetors – p – n photodiode. PIN photodiode, Phototransistors, Optocouplers, Solar cells, Display devices, Optical Fibres-Light propagation in fibre, Types of fibre, Characteristic parameters, Modes, Fibre splicing, Fibre optic communication system-coupling to and from the fibre, Modulation, Multiplexing and coding, Repeaters, Bandwidth and Rise time budgets.
Unit – X (a): Transduces – Resistance, Inductance Capacitance, Peizoelectric, Thermoelectric, Hall effect, Photoelectric, Techogenerators, Measurement of displacement, velocity, acceleration, force, torque, strain, speed and sound temperature, pressure, flow, humidity, thickness, pH, position.
Measuring Equipment-Measurement of R, L and C, Bridge and Potentiometers, voltage, current, power, energy, frequency / time, phase, DVMs, DMMs, CRO, Digital storage oscilloscope, Logic probes, Logic State Analyser, Spectrum Analyzer, Recorder, Noise and Interference in instrumentation, Instrumentation amplifiers, Radio Telemetry.
Analytical Instruments – Biomedical instruments – ECG, blood pressure measurements, spectrophotometers, Electron Microscope, X-ray diffractometer.
Unit – X (b): Open – loop and close-loop control system. Error amplifier, on – off controller, Proportional (P), Proportional-Integral (PI), Proportional – Derivative (PD), PID controllers, Dynamic Behaviour of control systems-servomechanism characteristics parameters of control systems-Accuracy, Sensitivity, Disturbances, Transient response, Stability, Rputh-Hurwitz criterion, Bode plots, Nyquist criterion, Controlling speed. Temperature and position using analog / digital control circuits.
ELECTRONIC SCIENCE MCQs
1. For a JFET IDSS = 8 mA and peak voltage Vp = –8V, what will be the drain current for gate to source voltage of –2V?
(A) 4.5 mA
(B) 8 mA
(C) 16 mA
(D) 12 mA
Ans: A
2. A tree in a network has a
(A) Closed path
(B) No closed path
(C) No nodes
(D) No branches
Ans: B
3. Microprocessor 8086 allows floating point arithmetic calculations in
(A) Maximum mode
(B) Minimum mode
(C) Both maximum and minimum modes
(D) Neither in maximum nor in minimum mode
Ans: A
4. C Language is a _________
(A) High level language
(B) Low level language
(C) Machine level language
(D) Middle level language
Ans: D
5. A 20 kW carrier is sinusoidally modulated by two carriers corresponding to modulation index of 30% and 40% respectively. The total radiated power is
(A) 25 kW
(B) 22.5 kW
(C) 45.0 kW
(D) 35.0 kW
Ans: B
6. ASCII code has 128 characters, which are binary coded. If a computer generates 10۸6 characters per second, then minimum band width required to transmit this signal will be
(A) 1.4 mbps
(B) 14 mbps
(C) 7 mbps
(D) 0.7 mbps
Ans: C
7. When the current through SCR is greater than holding current, then the voltage across the SCR is
(A) 1.4 V
(B) 0 V
(C) Supply voltage
(D) Half the load voltage
Ans: A
8. Dispersion shifted wave length is
(A) 800 nm
(B) 1550 nm
(C) 1310 nm
(D) 1200 nm
Ans: B
9. The most suitable instrument for the measurement of voltage is
(A) DVM
(B) Analog voltmeter
(C) CRO
(D) DMM
Ans: C
10. In a ‘C’ language expression, if the following expressions appear, which will be evaluated first?
(A) x + y
(B) x . y
(C) (x + y)
(D) x/y
Ans: C
11. Which of the following chip is used in 8085 microprocessor 3-chip configuration?
(A) IC 8255
(B) IC 8155
(C) IC 8251
(D) IC 8257
Ans: B
12. Which is a three-terminal negative voltage regulator IC?
(A) 78 XX
(B) IC 723
(C) LM 317
(D) 79 XX
Ans: D
13. Three identical stages have overall upper 3 dB frequency of 2 KHz and lower 3 dB frequency of 20 Hz. What is the value of fH of each stage?
(A) 13 KHz
(B) 26 KHz
(C) 39 KHz
(D) 52 KHz
Ans: C
The following items consist of two statements, one labelled the “Assertion (A)” and the other labelled the “Reason (R)”. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer accordingly.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
14. Assertion (A): Tunnel diode provides oscillations in the microwave region.
Reason (R): The equivalent RC model of tunnel diode gives frequency in the microwave region.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
15. Assertion (A): The roots of the denominator of a network function decide its stability.
Reason (R): The poles on realax is determine the damping factor of the system.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
16. Assertion (A): The fast changing inputs do not depend upon slew rate property of an OPAMP.
Reason (R): Schmitt trigger does not work on the slew rate property of an OPAMP.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
17. Assertion (A): A parallel comparator ADC requires in – built no. of comparators = 2N -1.
Reason (R): The speed of parallel comparator is limited by the speed of comparator.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
18. Assertion (A): Microcontrollers are preferred in Real time applications.
Reason (R): The on chip I/O integration has no bearing on the speed of microcontroller.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
19. Assertion (A): In ‘FORTRAN’ pointers are provided.
Reason (R): Pointers help to work with actual physical addresses.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
20. Assertion (A): Divergence theorem is applicable for both static and time varying fields.
Reason (R): It is used to find enclosed charge from the knowledge of either – D or – E.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
21. Assertion (A): The back e.m.f. of a d.c. motor depends upon series winding and armature resistance.
Reason (R): When there is no load, the back emf is minimum.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
22. Assertion (A): By using wavelength division, multiplexing the capacity of an optical fibre can be enhanced.
Reason (R): The separation between two adjacent channels in WDM is of the order of 50nm.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
23. Assertion (A): The sign of all terms in the first row of Routh’s array are checked, for stability considerations.
Reason (R): The number of sign changes equals the no. of roots on the right hand side of s-plane.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
24. Consider the following four transistors
1. CE mode
2. CC mode
3. MOSFET
4. FET
The correct order in which, the input impedance increases is
(A) 1, 2, 4, 3
(B) 1, 2, 3, 4
(C) 1, 3, 2, 4
(D) 4, 3, 2, 1
Ans: A
25. The correct order in which the power dissipation in transistor in power amplifiers decreases:
1. Class A
2. Class C
3. Class B
4. Class AB
The correct order is
(A) 1, 3, 2 and 4
(B) 1, 3, 4 and 2
(C) 1, 2, 3, 4
(D) 4, 3, 2, 1
Ans: B
26. The following are the interrupts of 8085 microprocessor:
1. INTR
2. TRAP
3. RST 7.5
4. RST 5.5
The correct order in which these interrupts will be executed, if arrive simultaneously:
(A) 1, 2, 3, 4
(B) 2, 3, 1, 4
(C) 2, 3, 4, 1
(D) 4, 1, 2, 3
Ans: C
27. The following are the oscillators:
1. Crystal
2. Weinbridge
3. Colpitt’s
4. Tunnel diode oscillator
The correct sequence of decreasing order of the frequency of oscillation will be:
(A) 4, 1, 3, 2
(B) 4, 1, 2, 3
(C) 4, 3, 2, 1
(D) 4, 2, 3, 1
Ans: A
28. Following are the controllers:
1. On-off
2. PID
3. PI
The correct order of the decrease in error output is
(A) 1, 2, 3
(B) 1, 3, 2
(C) 3, 2, 1
(D) 3, 1, 2
Ans: B
29. If the branch in any network has a current source then the analysis is carried out by _______ analysis method.
(A) Mesh
(B) Node
(C) Super mesh
(D) Super node
Ans: C
30. The transfer function of RC low-pass filter network
(A) RCs/1 + RCs
(B) 1/1 + RCs
(C) RC/1 + RCs
(D) S/1 + RCs
Ans: B
31. Biasing is done in class A mode to
(A) Save power
(B) Improve stability
(C) Reduce number of sources
(D) Both (B) and (C)
Ans: D
32. In analog computation, we use
(A) Both integrator and differentiator
(B) Only integrator
(C) Only differentiator
(D) Both in pair
Ans: B
33. The largest decimal number that can be stored in a MOD-64 counter is
(A) 64
(B) 15
(C) 16
(D) 63
Ans: D
34. What is the Register address which matches with the address of the stack?
(A) 03H
(B) 07H
(C) 013H
(D) 13H
Ans: B
35. In 8259, to avoid causing an interrupt due to an accidental noise pulse, the following action is done:
(A) All unused interrupt lines are shorted together.
(B) All unused interrupt lines are connected to Vcc.
(C) All unused interrupt lines are connected to ground.
(D) All unused interrupt lines kept open.
Ans: C
36. Which of the ports in 8255, in which part of the port pins can be used as input lines and part of the port pines can be used as output lines?
(A) PA
(B) PB
(C) PC
(D) PD
Ans: C
37. Which loop structure would execute its statements at least once even if the test condition fails for the first time itself?
(A) For
(B) if-else
(C) Do-while
(D) While
Ans: C
38. The expression evaluates to false in
int l = 3, J =7;
double f = 5.5, g = 4.5;
charch = ‘T’;
(A) (l < = 5) && (ch = = ‘T’)
(B) (l< 8) 11 (ch = = ‘L’)
(C) (f > = 6) 11 (l . j) < 15
(D) (f + g) = = 10.011 i < 2
Ans: C
39. Word NEHA is to be entered in an array. Which array declaration is proper?
(A) Char name [4] = {‘N’, ‘E’, ‘H’, ‘A’};
(B) Char name [5] = {‘N’, ‘E’, ‘H’, ‘A’ ‘\O’};
(C) Char name [4] = “NEHA”;
(D) Char name [4] = ‘NEHA’;
Ans: B
40. An air filled rectangular waveguide has dimensions 6 cm X 4 cm. The cut off frequency for TE10 is
(A) 2.5 GHz
(B) 25 MHz
(C) 20.5 GHz
(D) 5 GHz
Ans: A
41. An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern
(A) Is more directive
(B) is less directive
(C) is same that of transmitting antenna
(D) Exhibits no directivity at all.
Ans: C
42. The modulation index of an AM wave in changed from 0 to 1. The transmitted power is
(A) Unchanged
(B) Halved
(C) Doubled
(D) Increased by 50 percent
Ans: B
43. In a low level AM system, amplifiers following the modulated stage must be
(A) Linear devices
(B) Harmonic devices
(C) Class C amplifier
(D) Non-linear devices
Ans: B
44. Indicate the false statement. The square of the thermal noise voltage generated by a resistor is proportional to
(A) Its temperature
(B) Its resistance
(C) Boltzmann constant
(D) The bandwidth over which it is measured
Ans: A
45. Arrange the following configurations of BJT in the increasing order of their input impedance.
I. CE
II. CB
III. CC
IV. Darlington pair
(A) III, II, IV, I
(B) I, II, III, IV
(C) IV, III, II, I
(D) II, I, III, IV
Ans: D
46. The correct order in which data is most reliably transmitted
(i) Current loop
(ii) V to F conversion
(iii) Voltage transmission
(iv) Digital data communication
(A) (iii), (i), (ii), (iv)
(B) (ii), (iv), (i), (iii)
(C) (i), (iv), (iii), (ii)
(D) (iv), (iii), (ii), (i)
Ans: A
47. Consider the Analogue to Digital convertion given below:
I. Successive approximation ADC
II. Dual-slope ADC
III. Counter method ADC
IV. Simultaneous ADC
The correct sequence of the ascending order in terms of speed of the above ADC’s is:
(A) I, II, III, IV
(B) II, I, III, IV
(C) IV, II, I, III
(D) III, II, I, IV
Ans: B
48. The following operations are done during the execution of an instruction:
(i) Decode
(ii) Fetch
(iii) Signal transfer
(iv) Execute
(A) (i), (ii), (iii), (iv)
(B) (ii), (i), (iv), (iii)
(C) (iii), (i), (ii), (iv)
(D) (ii), (i), (iii), (iv)
Ans: B
49. The correct sequence of hierarchy of operators is _____. From highest to lowest.
(i) – or +
(ii) ( )
(iii) / or *
(iv) * *
(A) (i), (iii), (iv)
(B) (ii), (iv), (iii)
(C) (ii), (iii), (i)
(D) (iv), (ii), (i)
Ans: B
50. Match List – I with List – II.
List – I List – II
a. Monostablemultivibrator 1. No-stable state
b. Astablemultivibrator 2. One-stable state
c. Free-running multivibrator 3. Two-stable state
d. Bistablemultivibrator 4. Alternate high and low output
Codes:
a b c d
(A) 2 3 1 4
(B) 3 2 4 1
(C) 1 3 4 2
(D) 2 1 4 3
Ans: D
(A) 4.5 mA
(B) 8 mA
(C) 16 mA
(D) 12 mA
Ans: A
2. A tree in a network has a
(A) Closed path
(B) No closed path
(C) No nodes
(D) No branches
Ans: B
3. Microprocessor 8086 allows floating point arithmetic calculations in
(A) Maximum mode
(B) Minimum mode
(C) Both maximum and minimum modes
(D) Neither in maximum nor in minimum mode
Ans: A
4. C Language is a _________
(A) High level language
(B) Low level language
(C) Machine level language
(D) Middle level language
Ans: D
5. A 20 kW carrier is sinusoidally modulated by two carriers corresponding to modulation index of 30% and 40% respectively. The total radiated power is
(A) 25 kW
(B) 22.5 kW
(C) 45.0 kW
(D) 35.0 kW
Ans: B
6. ASCII code has 128 characters, which are binary coded. If a computer generates 10۸6 characters per second, then minimum band width required to transmit this signal will be
(A) 1.4 mbps
(B) 14 mbps
(C) 7 mbps
(D) 0.7 mbps
Ans: C
7. When the current through SCR is greater than holding current, then the voltage across the SCR is
(A) 1.4 V
(B) 0 V
(C) Supply voltage
(D) Half the load voltage
Ans: A
8. Dispersion shifted wave length is
(A) 800 nm
(B) 1550 nm
(C) 1310 nm
(D) 1200 nm
Ans: B
9. The most suitable instrument for the measurement of voltage is
(A) DVM
(B) Analog voltmeter
(C) CRO
(D) DMM
Ans: C
10. In a ‘C’ language expression, if the following expressions appear, which will be evaluated first?
(A) x + y
(B) x . y
(C) (x + y)
(D) x/y
Ans: C
11. Which of the following chip is used in 8085 microprocessor 3-chip configuration?
(A) IC 8255
(B) IC 8155
(C) IC 8251
(D) IC 8257
Ans: B
12. Which is a three-terminal negative voltage regulator IC?
(A) 78 XX
(B) IC 723
(C) LM 317
(D) 79 XX
Ans: D
13. Three identical stages have overall upper 3 dB frequency of 2 KHz and lower 3 dB frequency of 20 Hz. What is the value of fH of each stage?
(A) 13 KHz
(B) 26 KHz
(C) 39 KHz
(D) 52 KHz
Ans: C
The following items consist of two statements, one labelled the “Assertion (A)” and the other labelled the “Reason (R)”. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer accordingly.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
14. Assertion (A): Tunnel diode provides oscillations in the microwave region.
Reason (R): The equivalent RC model of tunnel diode gives frequency in the microwave region.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
15. Assertion (A): The roots of the denominator of a network function decide its stability.
Reason (R): The poles on realax is determine the damping factor of the system.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
16. Assertion (A): The fast changing inputs do not depend upon slew rate property of an OPAMP.
Reason (R): Schmitt trigger does not work on the slew rate property of an OPAMP.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
17. Assertion (A): A parallel comparator ADC requires in – built no. of comparators = 2N -1.
Reason (R): The speed of parallel comparator is limited by the speed of comparator.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
18. Assertion (A): Microcontrollers are preferred in Real time applications.
Reason (R): The on chip I/O integration has no bearing on the speed of microcontroller.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
19. Assertion (A): In ‘FORTRAN’ pointers are provided.
Reason (R): Pointers help to work with actual physical addresses.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
20. Assertion (A): Divergence theorem is applicable for both static and time varying fields.
Reason (R): It is used to find enclosed charge from the knowledge of either – D or – E.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: A
21. Assertion (A): The back e.m.f. of a d.c. motor depends upon series winding and armature resistance.
Reason (R): When there is no load, the back emf is minimum.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
22. Assertion (A): By using wavelength division, multiplexing the capacity of an optical fibre can be enhanced.
Reason (R): The separation between two adjacent channels in WDM is of the order of 50nm.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: C
23. Assertion (A): The sign of all terms in the first row of Routh’s array are checked, for stability considerations.
Reason (R): The number of sign changes equals the no. of roots on the right hand side of s-plane.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true, but (R) is not correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
Ans: D
24. Consider the following four transistors
1. CE mode
2. CC mode
3. MOSFET
4. FET
The correct order in which, the input impedance increases is
(A) 1, 2, 4, 3
(B) 1, 2, 3, 4
(C) 1, 3, 2, 4
(D) 4, 3, 2, 1
Ans: A
25. The correct order in which the power dissipation in transistor in power amplifiers decreases:
1. Class A
2. Class C
3. Class B
4. Class AB
The correct order is
(A) 1, 3, 2 and 4
(B) 1, 3, 4 and 2
(C) 1, 2, 3, 4
(D) 4, 3, 2, 1
Ans: B
26. The following are the interrupts of 8085 microprocessor:
1. INTR
2. TRAP
3. RST 7.5
4. RST 5.5
The correct order in which these interrupts will be executed, if arrive simultaneously:
(A) 1, 2, 3, 4
(B) 2, 3, 1, 4
(C) 2, 3, 4, 1
(D) 4, 1, 2, 3
Ans: C
27. The following are the oscillators:
1. Crystal
2. Weinbridge
3. Colpitt’s
4. Tunnel diode oscillator
The correct sequence of decreasing order of the frequency of oscillation will be:
(A) 4, 1, 3, 2
(B) 4, 1, 2, 3
(C) 4, 3, 2, 1
(D) 4, 2, 3, 1
Ans: A
28. Following are the controllers:
1. On-off
2. PID
3. PI
The correct order of the decrease in error output is
(A) 1, 2, 3
(B) 1, 3, 2
(C) 3, 2, 1
(D) 3, 1, 2
Ans: B
29. If the branch in any network has a current source then the analysis is carried out by _______ analysis method.
(A) Mesh
(B) Node
(C) Super mesh
(D) Super node
Ans: C
30. The transfer function of RC low-pass filter network
(A) RCs/1 + RCs
(B) 1/1 + RCs
(C) RC/1 + RCs
(D) S/1 + RCs
Ans: B
31. Biasing is done in class A mode to
(A) Save power
(B) Improve stability
(C) Reduce number of sources
(D) Both (B) and (C)
Ans: D
32. In analog computation, we use
(A) Both integrator and differentiator
(B) Only integrator
(C) Only differentiator
(D) Both in pair
Ans: B
33. The largest decimal number that can be stored in a MOD-64 counter is
(A) 64
(B) 15
(C) 16
(D) 63
Ans: D
34. What is the Register address which matches with the address of the stack?
(A) 03H
(B) 07H
(C) 013H
(D) 13H
Ans: B
35. In 8259, to avoid causing an interrupt due to an accidental noise pulse, the following action is done:
(A) All unused interrupt lines are shorted together.
(B) All unused interrupt lines are connected to Vcc.
(C) All unused interrupt lines are connected to ground.
(D) All unused interrupt lines kept open.
Ans: C
36. Which of the ports in 8255, in which part of the port pins can be used as input lines and part of the port pines can be used as output lines?
(A) PA
(B) PB
(C) PC
(D) PD
Ans: C
37. Which loop structure would execute its statements at least once even if the test condition fails for the first time itself?
(A) For
(B) if-else
(C) Do-while
(D) While
Ans: C
38. The expression evaluates to false in
int l = 3, J =7;
double f = 5.5, g = 4.5;
charch = ‘T’;
(A) (l < = 5) && (ch = = ‘T’)
(B) (l< 8) 11 (ch = = ‘L’)
(C) (f > = 6) 11 (l . j) < 15
(D) (f + g) = = 10.011 i < 2
Ans: C
39. Word NEHA is to be entered in an array. Which array declaration is proper?
(A) Char name [4] = {‘N’, ‘E’, ‘H’, ‘A’};
(B) Char name [5] = {‘N’, ‘E’, ‘H’, ‘A’ ‘\O’};
(C) Char name [4] = “NEHA”;
(D) Char name [4] = ‘NEHA’;
Ans: B
40. An air filled rectangular waveguide has dimensions 6 cm X 4 cm. The cut off frequency for TE10 is
(A) 2.5 GHz
(B) 25 MHz
(C) 20.5 GHz
(D) 5 GHz
Ans: A
41. An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern
(A) Is more directive
(B) is less directive
(C) is same that of transmitting antenna
(D) Exhibits no directivity at all.
Ans: C
42. The modulation index of an AM wave in changed from 0 to 1. The transmitted power is
(A) Unchanged
(B) Halved
(C) Doubled
(D) Increased by 50 percent
Ans: B
43. In a low level AM system, amplifiers following the modulated stage must be
(A) Linear devices
(B) Harmonic devices
(C) Class C amplifier
(D) Non-linear devices
Ans: B
44. Indicate the false statement. The square of the thermal noise voltage generated by a resistor is proportional to
(A) Its temperature
(B) Its resistance
(C) Boltzmann constant
(D) The bandwidth over which it is measured
Ans: A
45. Arrange the following configurations of BJT in the increasing order of their input impedance.
I. CE
II. CB
III. CC
IV. Darlington pair
(A) III, II, IV, I
(B) I, II, III, IV
(C) IV, III, II, I
(D) II, I, III, IV
Ans: D
46. The correct order in which data is most reliably transmitted
(i) Current loop
(ii) V to F conversion
(iii) Voltage transmission
(iv) Digital data communication
(A) (iii), (i), (ii), (iv)
(B) (ii), (iv), (i), (iii)
(C) (i), (iv), (iii), (ii)
(D) (iv), (iii), (ii), (i)
Ans: A
47. Consider the Analogue to Digital convertion given below:
I. Successive approximation ADC
II. Dual-slope ADC
III. Counter method ADC
IV. Simultaneous ADC
The correct sequence of the ascending order in terms of speed of the above ADC’s is:
(A) I, II, III, IV
(B) II, I, III, IV
(C) IV, II, I, III
(D) III, II, I, IV
Ans: B
48. The following operations are done during the execution of an instruction:
(i) Decode
(ii) Fetch
(iii) Signal transfer
(iv) Execute
(A) (i), (ii), (iii), (iv)
(B) (ii), (i), (iv), (iii)
(C) (iii), (i), (ii), (iv)
(D) (ii), (i), (iii), (iv)
Ans: B
49. The correct sequence of hierarchy of operators is _____. From highest to lowest.
(i) – or +
(ii) ( )
(iii) / or *
(iv) * *
(A) (i), (iii), (iv)
(B) (ii), (iv), (iii)
(C) (ii), (iii), (i)
(D) (iv), (ii), (i)
Ans: B
50. Match List – I with List – II.
List – I List – II
a. Monostablemultivibrator 1. No-stable state
b. Astablemultivibrator 2. One-stable state
c. Free-running multivibrator 3. Two-stable state
d. Bistablemultivibrator 4. Alternate high and low output
Codes:
a b c d
(A) 2 3 1 4
(B) 3 2 4 1
(C) 1 3 4 2
(D) 2 1 4 3
Ans: D
Read the passage below and answer the questions 51 to 55, that follows based on your understanding of the passage:
Many instruments require dc power of their operation. This power is available from a portable cell; however, the power output is low besides other problems. AC power is continuously and easily available, so it is convenient to use it. However, ac power must be converted into dc power.
The devices such as half-wave, full wave and bridge rectifiers convert bi-directional voltage to uni-directional voltage. However, the output has large ripple contents. Filters are used to reduce the ripple significantly. Various filters circuits and L, C, LC and CLC. The power supply with rectifier and filter is still unregulated.
The output of such power supplies varies with variations in a.c. mains voltage, load current and temperature. In order to maintain the output at constant level, voltage or current regulation is necessary. This is obtained by using series or shunt feedback. In addition to regulation, the power supply also requires protection e.g. overload, over current or short circuit protection. Pre- regulation is also carried out to improve the stability.
Regulators can be designed by using discrete components. However, IC regulators are also available. These regulators have facilities like:
(i) Voltage / current boosting
(ii) Thermal shut-down
(iii) Floating point to facilitate higher output voltage
(iv) Switching regulator to reduce the power dissipation.
51. The minimum supply voltage to operate IC 7815 is
(A) 15 V
(B) 17 V
(C) 25 V
(D) 40 V
Ans: C
52. In low voltage, low current model, IC 723 gives output voltage in the range of
(A) 2 to 7 V
(B) 5 to 10 V
(C) 0 to 10 V
(D) 0 to 7 V
Ans: A
53. For a d.c. output of 30 V, from a full wave rectifier, the PIV rating of the diode should be minimum
(A) 50 V
(B) 75 V
(C) 100 V
(D) 200 V
Ans: C
54. The critical inductance in mains power supply ensures that the current through ‘L’ never becomes zero. For this, critical value of inductance is
(A)RL/310
(B)RL/450
(C)RL/620
(D)RL/942
Ans: D
55. In series pass voltage regulator using zener diode, the function of zener diode is a.
(A) Voltage regulator
(B) Voltage comparator
(C) Breakdown diode
(D) Temperature compensator
Ans: B
Read the passage below and answer the questions 56 to 60:
The World’s first microprocessor, 4004, was introduced by Intel in 1968. It was a 4 bit processor, but later it has introduced a new processor almost every year, like 8080, 8085, 8086, 8031 and 8051. Only 8086 processor handles 16 bit data and a micro-computer was developed based on this processor. Intel also introduced 80186, 80286, 80386, and 80486 and made possible to get mini computers and personal computers.
Other companies like Texas instruments, Motorola, Zilog and Analogue devices have specialized in signal processing processors, communication oriented processors, better architectural processor, and discrete signal processing devices.
All the advancements mentioned above are made possible because of continuous up gradation of VLSI technology. Some of the features like cache, pipelining and branch prediction have contributed for improving performance parameters, like execution speed, large memory, fast data transfers and reduction in number of instructions. A transformation has been seen from CISC to RISC.
Identification of application and its potential for marketing provides the opportunity to companies to produce ASICs sometimes. Digital Signal Processors are employed for processing streamed data of either voice or video data.
56. Expansion of ASIC is:
(A) Applied Science Integrated Circuit.
(B) Application Specific Integrated Circuit.
(C) Application Specific Internal Circuit.
(D) Application of Science and Integrated Circuit.
Ans: B
57. 8 bit date lines are not employed by the following processor:
(A) 8080
(B) 8085
(C) 8086
(D) 8051
Ans: C
58. Which one is not enhanced feature in spite of VLSI advances?
(A) Pipelining
(B) Branch prediction
(C) Power consumption
(D) Cache
Ans: C
59. Which of the following is not signalling processing?
(A) Date filtering
(B) Convolution
(C) Noise addition
(D) Date storing
Ans: D
60. Expansion of RISC:
(A) Reduced Integrated Systems Circuit
(B) Reduced Instructions Set Computer
(C) Reduction Integrated System Computer
(D) Reduced Instructions System Circuit
Ans: B
Many instruments require dc power of their operation. This power is available from a portable cell; however, the power output is low besides other problems. AC power is continuously and easily available, so it is convenient to use it. However, ac power must be converted into dc power.
The devices such as half-wave, full wave and bridge rectifiers convert bi-directional voltage to uni-directional voltage. However, the output has large ripple contents. Filters are used to reduce the ripple significantly. Various filters circuits and L, C, LC and CLC. The power supply with rectifier and filter is still unregulated.
The output of such power supplies varies with variations in a.c. mains voltage, load current and temperature. In order to maintain the output at constant level, voltage or current regulation is necessary. This is obtained by using series or shunt feedback. In addition to regulation, the power supply also requires protection e.g. overload, over current or short circuit protection. Pre- regulation is also carried out to improve the stability.
Regulators can be designed by using discrete components. However, IC regulators are also available. These regulators have facilities like:
(i) Voltage / current boosting
(ii) Thermal shut-down
(iii) Floating point to facilitate higher output voltage
(iv) Switching regulator to reduce the power dissipation.
51. The minimum supply voltage to operate IC 7815 is
(A) 15 V
(B) 17 V
(C) 25 V
(D) 40 V
Ans: C
52. In low voltage, low current model, IC 723 gives output voltage in the range of
(A) 2 to 7 V
(B) 5 to 10 V
(C) 0 to 10 V
(D) 0 to 7 V
Ans: A
53. For a d.c. output of 30 V, from a full wave rectifier, the PIV rating of the diode should be minimum
(A) 50 V
(B) 75 V
(C) 100 V
(D) 200 V
Ans: C
54. The critical inductance in mains power supply ensures that the current through ‘L’ never becomes zero. For this, critical value of inductance is
(A)RL/310
(B)RL/450
(C)RL/620
(D)RL/942
Ans: D
55. In series pass voltage regulator using zener diode, the function of zener diode is a.
(A) Voltage regulator
(B) Voltage comparator
(C) Breakdown diode
(D) Temperature compensator
Ans: B
Read the passage below and answer the questions 56 to 60:
The World’s first microprocessor, 4004, was introduced by Intel in 1968. It was a 4 bit processor, but later it has introduced a new processor almost every year, like 8080, 8085, 8086, 8031 and 8051. Only 8086 processor handles 16 bit data and a micro-computer was developed based on this processor. Intel also introduced 80186, 80286, 80386, and 80486 and made possible to get mini computers and personal computers.
Other companies like Texas instruments, Motorola, Zilog and Analogue devices have specialized in signal processing processors, communication oriented processors, better architectural processor, and discrete signal processing devices.
All the advancements mentioned above are made possible because of continuous up gradation of VLSI technology. Some of the features like cache, pipelining and branch prediction have contributed for improving performance parameters, like execution speed, large memory, fast data transfers and reduction in number of instructions. A transformation has been seen from CISC to RISC.
Identification of application and its potential for marketing provides the opportunity to companies to produce ASICs sometimes. Digital Signal Processors are employed for processing streamed data of either voice or video data.
56. Expansion of ASIC is:
(A) Applied Science Integrated Circuit.
(B) Application Specific Integrated Circuit.
(C) Application Specific Internal Circuit.
(D) Application of Science and Integrated Circuit.
Ans: B
57. 8 bit date lines are not employed by the following processor:
(A) 8080
(B) 8085
(C) 8086
(D) 8051
Ans: C
58. Which one is not enhanced feature in spite of VLSI advances?
(A) Pipelining
(B) Branch prediction
(C) Power consumption
(D) Cache
Ans: C
59. Which of the following is not signalling processing?
(A) Date filtering
(B) Convolution
(C) Noise addition
(D) Date storing
Ans: D
60. Expansion of RISC:
(A) Reduced Integrated Systems Circuit
(B) Reduced Instructions Set Computer
(C) Reduction Integrated System Computer
(D) Reduced Instructions System Circuit
Ans: B
61. The output of a dc motor depends mainly on
(A) Speed and torque
(B) Speed and back emf
(C) Speed and applied voltage
(D) Speed and load resistance
Ans: A
62. A system is said to be stable if and only if
(A) All poles lie on the right half of S. plane.
(B) All poles lie in the left half of the S-plane.
(C) All poles and zeros lie on the right half of S-planes.
(D) Some poles lie on the half of the S-plane and some lie on the right half of the S-plane.
Ans: B
63. Which of the following is/are valid statement(s)?
I. AJFET has one built-in diode.
II. AJFET has two built-in diode.
III. The pinch off voltage of a JFET has same magnitude as that of gate voltage.
IV. A JFET is a voltage controlled device.
(A) I, III, IV
(B) II, III,IV
(C) II, III
(D) II, IV
Ans: B
64. Which one of the following is an adjustable IC voltage regulator?
(A) IC 7824
(B) IC 7912
(C) LM 338
(D) IC 7808
Ans: C
65. The attenuation of single mode fibers is 0.2 dB/km, at a transmission length of 100 kms. The output signal strength is reduced to
(A) 10% of transmitted power
(B) 1% of transmitter power
(C) 5% of the transmitted power
(D) 20% of the transmitted power
Ans: B
66. Which of the following circuit come under the class of combinational logic circuits?
I. Full Adder
II. Full Subtractor
III. Counter
IV. Multiplexer
(A) I and II are correct.
(B) I, II, IV are correct.
(C) II, III, IV are correct.
(D) I, III and IV are correct.
Ans: B
67. For using 8253 in counter mode from a initial value.
I. The control world for selection of counter is done.
II. The initial value will be kept in the counter before the selection of counter.
III. Selection of BCD mode is done.
IV. The initial value will be loaded to counter after the selection of counter.
(A) I, III and IV are to be fulfilled.
(B) I, II and III are to be fulfilled.
(C) II, III and IV are to be fulfilled.
(D) II, I and IV are to be fulfilled.
Ans: A
68. Which of the following statements will post increment the variable by 1?
I. a = a + 1;
II. a + = 1;
III. a + +;
IV. a = + 1;
(A) Options I, II, III are correct.
(B) Options II, III, IV are correct.
(C) Options I, II are correct.
(D) Options III, IV are correct.
Ans: A
69. In optical fiber communications
I. Inter modal dispersion can be avoided by using SMF.
II. Inter modal dispersion can be avoided by using MMF.
III. Third transmission window wavelength is used to avoid Rayleigh scattering losses.
IV. 800-900 nm window is used to avoid Rayleigh’s scattering losses.
(A) Options II and III are correct.
(B) Options II and IV are correct.
(C) Options I and III are correct.
(D) Options IV and I are correct.
Ans: C
70. Indicate the false statement.
(i) HF mixers are generally noiser than HF amplifier.
(ii) Impulse noise voltage is independent of bandwidth.
(iii) In thermal noise, the noise power generated by a resistor is proportional to the bandwidth.
(iv) Industrial noise is not an impulse type.
(A) (i) and (ii) are correct.
(B) (ii) and (iii) are correct.
(C) (iii) and (iv) are correct.
(D) (i) and (iii) are correct.
Ans: D
71. During the process of milk boiling, the heater is to be put off before the bubble gets over spilled. The following controls are put in operation while switching off the heater. They are
I. Only proportional
II. Only integral
III. Proportional and derivative controls are followed.
IV. Only derivative
(A) I as well as II are followed.
(B) I as well as IV are followed.
(C) Only III is followed.
(D) I, II and IV are followed.
Ans: B
The following items consist of two statements, one labelled the ‘Assertion (A)’ and the other labelled the ‘Reason (R)’. You are to examine these two statements and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
72. Assertion (A): An intrinsic semiconductor is doped lightly with p-type impurity. Its conductivity decreases till a certain doping level is reached.
Reason (R): The mobility of both holes and electrons decreases.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
73. Assertion (A): Number of mesh current equations in a network depends upon the number of branches B and nodes N in a network.
Reason (R): Number of mesh current equations is B + N – 1.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
74. Assertion (A): Offsets in op-amp are introduced due to mismatch at differential input stage. The offsets change with time and temperature.
Reason (R): The offsets must be removed as they introduce noise in a.c. signals.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
75. Assertion (A): Dual slope A/D converter is the most preferred A/D conversion technique employed in most digital multimeters.
Reason (R): Dual slope A/D converter provides high accuracy and also suppresses the HUM effect on the input signal.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
76. Assertion (A): The default address for starting the execution of the program, is from 0000H. This is valid for Intel processors.
Reason (R): The starting address of RAM is from 0000H.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
77. Assertion (A): The break; statement is used to exit from if statement.
Reason (R): In while (1) loop break; statement is put at the end of a loop.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
78. Assertion (A): Magic Tee is a 4- junction hybrid Tee and displays power dividing properties in E and H plane and has advantage of being fully matched.
Reason (R): It has a hybrid junction about an imaginary plane bisecting two arms.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
79. Assertion (A): In the super heterodyne receiver, the signal voltage is combined with local oscillator voltage and normally converted into a signal of a lower fixed frequency.
Reason (R): The intermediate frequency of receiving system may be neither low or high, but in a certain range between the two.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
80. Assertion (A): PIN diodes are used as photo detectors. This is achieved by doping lightly doped in material in between p and n junctions.
Reason (R): These are used because higher frequency infra-red penetrate more deeply in the semiconductor material.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
81. Assertion (A): Due to two metals with different coefficient of expansion, when the junction is formed, the junction produces a voltage corresponding to temperature.
Reason (R): The metals which are used for making thermocouples are non-homogeneous.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
82. Following are the mediums of communication:
(i) Sea water
(ii) Sky waves
(iii) Space waves
(iv) Glass fibers
The correct sequence of operating frequencies in increasing order is:
(A) (iv), (iii), (ii), (i)
(B) (i), (ii), (iii), (iv)
(C) (ii), (iii), (iv), (i)
(D) (iv), (ii), (iii), (i)
Ans: B
83. Following are the steps for A to D conversion of the signal:
(i) Quantization
(ii) Sampling
(iii) Filtering
(iv) Encoding
The correct sequence of A to D conversion is
(A) (i), (ii), (iii), (iv)
(B) (ii), (i), (iv), (iii)
(C) (iv), (iii), (ii), (i)
(D) (iii), (ii), (i), (iv)
Ans: D
84. Following are the detectors used in optical communication:
(i) Photo diode
(ii) Photo-transistor
(iii) Avalanche photodiode
(iv) Pin diode
Correct sequence of gain in decreasing order is given by
(A) (iii), (iv), (ii), (i)
(B) (iv), (iii), (ii), (i)
(C) (i), (ii), (iii), (iv)
(D) (iv), (ii), (iii), (i)
Ans: A
85. The correct sequence to be followed to build data acquisition system is by arranging the steps as follows:
(i) Transducer
(ii) Software development
(iii) Range of parameter
(iv) Signal conditioning
(A) (i), (ii), (iii), (iv)
(B) (iv), (iii), (ii), (i)
(C) (iii), (i), (iv), (ii)
(D) (ii), (iii), (iv), (i)
Ans: C
86. Match List – I with List – II and select the correct answer using codes given below:
List – I List – II
a. Cut set 1. KVL
b. RC-differentiator 2. Branch voltage
c. Dual of KCL 3. Frequency response
d. Bode plots 4. High pass filter
Codes:
a b c d
(A) 2 4 1 3
(B) 3 2 4 1
(C) 4 3 1 2
(D) 1 2 4 3
Ans: A
87. Match List – I with List – II and select the correct answer using codes given below:
List – I List – II
a. Duty cycle 1. Variable voltage regulator
b. AGC 2. Astable multivibrator
c. LM317 3. Voltage regulator
d. Crow-bar protection 4. FET
Codes:
a b c d
(A) 1 2 3 4
(B) 3 4 1 2
(C) 4 3 2 1
(D) 2 4 1 3
Ans: D
88. Match List – I with List – II and select the correct answer by using the codes given below the lists:
List – I List – II
a. Multiplexer 1. Sequential memory
b. De-multiplexer 2. Converts decimal number to binary
c. Shift-register 3. Data Selection
d. Encoder 4. Routes out many data input with single data output
Codes:
a b c d
(A) 3 4 1 2
(B) 4 3 1 2
(C) 3 4 2 1
(D) 1 2 3 4
Ans: B
89. Match the following lists with correct ones:
List – I List – II
a. QUE 1. Z flag not affected
b. DX 2. Slow memory
c. DCX D 3. Reg B
d. MUL/DIV 4. Variable port addressing
Codes:
a b c d
(A) 4 2 3 1
(B) 2 4 3 1
(C) 4 2 1 3
(D) 2 4 1 3
Ans: D
90. Match List – I with List – II and select the correct answer using codes given below:
List – I List – II
a. if-then 1. Hex-data
b. % x 2. Garbage to calling function
c. gets( ) 3. On-off controller
d. return; 4. Multi word string
Codes:
a b c d
(A) 3 1 4 2
(B) 2 3 4 1
(C) 1 2 3 4
(D) 4 3 2 1
Ans: A
91. Match the following:
List – A List – B
a. Modem 1. Noise immunity better
b. FSK 2. Error correction
c. Codes 3. Frequency shift keying
d. PCM 4. Signal translator
Codes:
a b c d
(A) 4 3 2 1
(B) 3 2 1 4
(C) 2 1 3 4
(D) 1 4 2 3
Ans: A
92. Match List – I with List – II and select the correct answer using the codes given below:
List – I List – II
a. Choppers 1. pn pn devices
b. SCR 2. V number
c. SMF 3. Speed control of d.c. motors
d. LASER 4. Quantum well
Codes:
a b c d
(A) 3 2 4 1
(B) 3 1 2 4
(C) 4 2 1 3
(D) 4 3 2 1
Ans: B
(A) Speed and torque
(B) Speed and back emf
(C) Speed and applied voltage
(D) Speed and load resistance
Ans: A
62. A system is said to be stable if and only if
(A) All poles lie on the right half of S. plane.
(B) All poles lie in the left half of the S-plane.
(C) All poles and zeros lie on the right half of S-planes.
(D) Some poles lie on the half of the S-plane and some lie on the right half of the S-plane.
Ans: B
63. Which of the following is/are valid statement(s)?
I. AJFET has one built-in diode.
II. AJFET has two built-in diode.
III. The pinch off voltage of a JFET has same magnitude as that of gate voltage.
IV. A JFET is a voltage controlled device.
(A) I, III, IV
(B) II, III,IV
(C) II, III
(D) II, IV
Ans: B
64. Which one of the following is an adjustable IC voltage regulator?
(A) IC 7824
(B) IC 7912
(C) LM 338
(D) IC 7808
Ans: C
65. The attenuation of single mode fibers is 0.2 dB/km, at a transmission length of 100 kms. The output signal strength is reduced to
(A) 10% of transmitted power
(B) 1% of transmitter power
(C) 5% of the transmitted power
(D) 20% of the transmitted power
Ans: B
66. Which of the following circuit come under the class of combinational logic circuits?
I. Full Adder
II. Full Subtractor
III. Counter
IV. Multiplexer
(A) I and II are correct.
(B) I, II, IV are correct.
(C) II, III, IV are correct.
(D) I, III and IV are correct.
Ans: B
67. For using 8253 in counter mode from a initial value.
I. The control world for selection of counter is done.
II. The initial value will be kept in the counter before the selection of counter.
III. Selection of BCD mode is done.
IV. The initial value will be loaded to counter after the selection of counter.
(A) I, III and IV are to be fulfilled.
(B) I, II and III are to be fulfilled.
(C) II, III and IV are to be fulfilled.
(D) II, I and IV are to be fulfilled.
Ans: A
68. Which of the following statements will post increment the variable by 1?
I. a = a + 1;
II. a + = 1;
III. a + +;
IV. a = + 1;
(A) Options I, II, III are correct.
(B) Options II, III, IV are correct.
(C) Options I, II are correct.
(D) Options III, IV are correct.
Ans: A
69. In optical fiber communications
I. Inter modal dispersion can be avoided by using SMF.
II. Inter modal dispersion can be avoided by using MMF.
III. Third transmission window wavelength is used to avoid Rayleigh scattering losses.
IV. 800-900 nm window is used to avoid Rayleigh’s scattering losses.
(A) Options II and III are correct.
(B) Options II and IV are correct.
(C) Options I and III are correct.
(D) Options IV and I are correct.
Ans: C
70. Indicate the false statement.
(i) HF mixers are generally noiser than HF amplifier.
(ii) Impulse noise voltage is independent of bandwidth.
(iii) In thermal noise, the noise power generated by a resistor is proportional to the bandwidth.
(iv) Industrial noise is not an impulse type.
(A) (i) and (ii) are correct.
(B) (ii) and (iii) are correct.
(C) (iii) and (iv) are correct.
(D) (i) and (iii) are correct.
Ans: D
71. During the process of milk boiling, the heater is to be put off before the bubble gets over spilled. The following controls are put in operation while switching off the heater. They are
I. Only proportional
II. Only integral
III. Proportional and derivative controls are followed.
IV. Only derivative
(A) I as well as II are followed.
(B) I as well as IV are followed.
(C) Only III is followed.
(D) I, II and IV are followed.
Ans: B
The following items consist of two statements, one labelled the ‘Assertion (A)’ and the other labelled the ‘Reason (R)’. You are to examine these two statements and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the Reason is a correct explanation of the Assertion. Select your answers to these items using the codes given below and mark your answer sheet accordingly.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
72. Assertion (A): An intrinsic semiconductor is doped lightly with p-type impurity. Its conductivity decreases till a certain doping level is reached.
Reason (R): The mobility of both holes and electrons decreases.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
73. Assertion (A): Number of mesh current equations in a network depends upon the number of branches B and nodes N in a network.
Reason (R): Number of mesh current equations is B + N – 1.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
74. Assertion (A): Offsets in op-amp are introduced due to mismatch at differential input stage. The offsets change with time and temperature.
Reason (R): The offsets must be removed as they introduce noise in a.c. signals.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
75. Assertion (A): Dual slope A/D converter is the most preferred A/D conversion technique employed in most digital multimeters.
Reason (R): Dual slope A/D converter provides high accuracy and also suppresses the HUM effect on the input signal.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
76. Assertion (A): The default address for starting the execution of the program, is from 0000H. This is valid for Intel processors.
Reason (R): The starting address of RAM is from 0000H.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
77. Assertion (A): The break; statement is used to exit from if statement.
Reason (R): In while (1) loop break; statement is put at the end of a loop.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
78. Assertion (A): Magic Tee is a 4- junction hybrid Tee and displays power dividing properties in E and H plane and has advantage of being fully matched.
Reason (R): It has a hybrid junction about an imaginary plane bisecting two arms.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
79. Assertion (A): In the super heterodyne receiver, the signal voltage is combined with local oscillator voltage and normally converted into a signal of a lower fixed frequency.
Reason (R): The intermediate frequency of receiving system may be neither low or high, but in a certain range between the two.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: A
80. Assertion (A): PIN diodes are used as photo detectors. This is achieved by doping lightly doped in material in between p and n junctions.
Reason (R): These are used because higher frequency infra-red penetrate more deeply in the semiconductor material.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: C
81. Assertion (A): Due to two metals with different coefficient of expansion, when the junction is formed, the junction produces a voltage corresponding to temperature.
Reason (R): The metals which are used for making thermocouples are non-homogeneous.
Codes:
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true and (R) is false.
(D) (A) is false and (R) is true.
Ans: B
82. Following are the mediums of communication:
(i) Sea water
(ii) Sky waves
(iii) Space waves
(iv) Glass fibers
The correct sequence of operating frequencies in increasing order is:
(A) (iv), (iii), (ii), (i)
(B) (i), (ii), (iii), (iv)
(C) (ii), (iii), (iv), (i)
(D) (iv), (ii), (iii), (i)
Ans: B
83. Following are the steps for A to D conversion of the signal:
(i) Quantization
(ii) Sampling
(iii) Filtering
(iv) Encoding
The correct sequence of A to D conversion is
(A) (i), (ii), (iii), (iv)
(B) (ii), (i), (iv), (iii)
(C) (iv), (iii), (ii), (i)
(D) (iii), (ii), (i), (iv)
Ans: D
84. Following are the detectors used in optical communication:
(i) Photo diode
(ii) Photo-transistor
(iii) Avalanche photodiode
(iv) Pin diode
Correct sequence of gain in decreasing order is given by
(A) (iii), (iv), (ii), (i)
(B) (iv), (iii), (ii), (i)
(C) (i), (ii), (iii), (iv)
(D) (iv), (ii), (iii), (i)
Ans: A
85. The correct sequence to be followed to build data acquisition system is by arranging the steps as follows:
(i) Transducer
(ii) Software development
(iii) Range of parameter
(iv) Signal conditioning
(A) (i), (ii), (iii), (iv)
(B) (iv), (iii), (ii), (i)
(C) (iii), (i), (iv), (ii)
(D) (ii), (iii), (iv), (i)
Ans: C
86. Match List – I with List – II and select the correct answer using codes given below:
List – I List – II
a. Cut set 1. KVL
b. RC-differentiator 2. Branch voltage
c. Dual of KCL 3. Frequency response
d. Bode plots 4. High pass filter
Codes:
a b c d
(A) 2 4 1 3
(B) 3 2 4 1
(C) 4 3 1 2
(D) 1 2 4 3
Ans: A
87. Match List – I with List – II and select the correct answer using codes given below:
List – I List – II
a. Duty cycle 1. Variable voltage regulator
b. AGC 2. Astable multivibrator
c. LM317 3. Voltage regulator
d. Crow-bar protection 4. FET
Codes:
a b c d
(A) 1 2 3 4
(B) 3 4 1 2
(C) 4 3 2 1
(D) 2 4 1 3
Ans: D
88. Match List – I with List – II and select the correct answer by using the codes given below the lists:
List – I List – II
a. Multiplexer 1. Sequential memory
b. De-multiplexer 2. Converts decimal number to binary
c. Shift-register 3. Data Selection
d. Encoder 4. Routes out many data input with single data output
Codes:
a b c d
(A) 3 4 1 2
(B) 4 3 1 2
(C) 3 4 2 1
(D) 1 2 3 4
Ans: B
89. Match the following lists with correct ones:
List – I List – II
a. QUE 1. Z flag not affected
b. DX 2. Slow memory
c. DCX D 3. Reg B
d. MUL/DIV 4. Variable port addressing
Codes:
a b c d
(A) 4 2 3 1
(B) 2 4 3 1
(C) 4 2 1 3
(D) 2 4 1 3
Ans: D
90. Match List – I with List – II and select the correct answer using codes given below:
List – I List – II
a. if-then 1. Hex-data
b. % x 2. Garbage to calling function
c. gets( ) 3. On-off controller
d. return; 4. Multi word string
Codes:
a b c d
(A) 3 1 4 2
(B) 2 3 4 1
(C) 1 2 3 4
(D) 4 3 2 1
Ans: A
91. Match the following:
List – A List – B
a. Modem 1. Noise immunity better
b. FSK 2. Error correction
c. Codes 3. Frequency shift keying
d. PCM 4. Signal translator
Codes:
a b c d
(A) 4 3 2 1
(B) 3 2 1 4
(C) 2 1 3 4
(D) 1 4 2 3
Ans: A
92. Match List – I with List – II and select the correct answer using the codes given below:
List – I List – II
a. Choppers 1. pn pn devices
b. SCR 2. V number
c. SMF 3. Speed control of d.c. motors
d. LASER 4. Quantum well
Codes:
a b c d
(A) 3 2 4 1
(B) 3 1 2 4
(C) 4 2 1 3
(D) 4 3 2 1
Ans: B
93. The interrupts in 8085 processor are
I. RST 6.5
II. RST 5.5
III. TRAP
IV. RST 0
Keep the sequence from least priority to highest priority.
(A) III, I, II, IV
(B) IV, I, II, III
(C) IV, II, I, III
(D) III, IV, II, I
Ans: C
94. The correct sequence to write a loop statement is formed
I. body
II. main( )
III. test condition
IV. initialization
(A) I, IV, II, III
(B) IV, III, I, II
(C) III, II, IV, I
(D) II, IV, III, I
Ans: D
95. The following frequency bands are used in microwaves:
I. Ku band
II. Ka band
III. L band
IV. C band
The correct sequence in decreasing frequency is by:
(A) II, III, IV, I
(B) I, II, III, IV
(C) II, I, III, IV
(D) II, I, IV, III
Ans: D
96. Consider the following communication systems:
I. Microwave communication system
II. Optical communication system
III. AM Broadcast system
IV. FM Broadcast system
The correct sequence of these systems from the point of view of increasing order of bandwidth is
(A) II, I, IV, III
(B) I, II, III, IV
(C) III, IV, II, I
(D) IV, III, I, II
Ans: A
97. The following are the fibers used in optical communication systems:
I. Plastic fibers
II. Plastic clad glass fibers
III. Glass fibers operating at 1330 nm
IV. Glass fibers operating at 1550 nm
The correct sequence of attenuation of the above fibers in increasing order are:
(A) I, II, III, IV
(B) IV, III, II, I
(C) II, I, IV, III
(D) IV, II, I, III
Ans: B
98. Arrange the steps given below in correct order:
I. Network function
II. Change of sign
III. Stability
IV. Routh array
The order in which the stability is evaluated using Routh criterion:
(A) I, III, II, IV
(B) I, IV, II, III
(C) IV, I, III, II
(D) III, II, I, IV
Ans: B
99. Match the given list of devices with their respective application :
List-I List-II
(a) Diode (i) Rectification
(b) Tunnel diode (ii) Microwave switching
(c) Zener diode (iii) Oscillator
(d) PIN diode (iv) Voltage regulator
Codes :
(a) (b) (c) (d)
(A) (i) (iii) (iv) (ii)
(B) (i) (iv) (iii) (ii)
(C) (i) (ii) (iii) (iv)
(D) (i) (iv) (ii) (iii)
Ans: A
100. Match List – I with List – II and select the correct answer using codes given below:
List-I List-II
(a) Voltage source in a branch (i) Polar capacitor
(b) Hysteresis (ii) Super node
(c) Non-bilateral (iii) h-parameters
(d) Transistor small signal model (iv) Avoid false triggering
Codes:
(a) (b) (c) (d)
(A) (i) (iv) (iii) (ii)
(B) (iii) (i) (ii) (iv)
(C) (ii) (iv) (i) (iii)
(D) (iv) (ii) (iii) (i)
Ans: C
I. RST 6.5
II. RST 5.5
III. TRAP
IV. RST 0
Keep the sequence from least priority to highest priority.
(A) III, I, II, IV
(B) IV, I, II, III
(C) IV, II, I, III
(D) III, IV, II, I
Ans: C
94. The correct sequence to write a loop statement is formed
I. body
II. main( )
III. test condition
IV. initialization
(A) I, IV, II, III
(B) IV, III, I, II
(C) III, II, IV, I
(D) II, IV, III, I
Ans: D
95. The following frequency bands are used in microwaves:
I. Ku band
II. Ka band
III. L band
IV. C band
The correct sequence in decreasing frequency is by:
(A) II, III, IV, I
(B) I, II, III, IV
(C) II, I, III, IV
(D) II, I, IV, III
Ans: D
96. Consider the following communication systems:
I. Microwave communication system
II. Optical communication system
III. AM Broadcast system
IV. FM Broadcast system
The correct sequence of these systems from the point of view of increasing order of bandwidth is
(A) II, I, IV, III
(B) I, II, III, IV
(C) III, IV, II, I
(D) IV, III, I, II
Ans: A
97. The following are the fibers used in optical communication systems:
I. Plastic fibers
II. Plastic clad glass fibers
III. Glass fibers operating at 1330 nm
IV. Glass fibers operating at 1550 nm
The correct sequence of attenuation of the above fibers in increasing order are:
(A) I, II, III, IV
(B) IV, III, II, I
(C) II, I, IV, III
(D) IV, II, I, III
Ans: B
98. Arrange the steps given below in correct order:
I. Network function
II. Change of sign
III. Stability
IV. Routh array
The order in which the stability is evaluated using Routh criterion:
(A) I, III, II, IV
(B) I, IV, II, III
(C) IV, I, III, II
(D) III, II, I, IV
Ans: B
99. Match the given list of devices with their respective application :
List-I List-II
(a) Diode (i) Rectification
(b) Tunnel diode (ii) Microwave switching
(c) Zener diode (iii) Oscillator
(d) PIN diode (iv) Voltage regulator
Codes :
(a) (b) (c) (d)
(A) (i) (iii) (iv) (ii)
(B) (i) (iv) (iii) (ii)
(C) (i) (ii) (iii) (iv)
(D) (i) (iv) (ii) (iii)
Ans: A
100. Match List – I with List – II and select the correct answer using codes given below:
List-I List-II
(a) Voltage source in a branch (i) Polar capacitor
(b) Hysteresis (ii) Super node
(c) Non-bilateral (iii) h-parameters
(d) Transistor small signal model (iv) Avoid false triggering
Codes:
(a) (b) (c) (d)
(A) (i) (iv) (iii) (ii)
(B) (iii) (i) (ii) (iv)
(C) (ii) (iv) (i) (iii)
(D) (iv) (ii) (iii) (i)
Ans: C
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