ELECTRONICS ENGINEERING- PAGE 3
ELECTRONICS ENGINEERING- PAGE 3 MCQs
1:-The software used for high performance numerical computation and visualization
A:-MASM
B:-MATLAB
C:-MENDELEY
D:-TASM
Ans: B
2:-VHSIC Hardware Description Language is commonly called
A:-VHDL
B:-Verilog HDL
C:-VHSHDL
D:-None of these
Ans: A
3:-In D'Arsonval Movement the torque exerted on the pivoted coil is proportional to the applied
A:-Voltage
B:-Current
C:-Power
D:-Amplitude
Ans: B
4:-LVDT is used to measure
A:-Temperature
B:-Humidity
C:-Displacement
D:-Magnetic Flux
Ans: C
5:-All pass filters are used for
A:-Phase correction
B:-Noise reduction
C:-Attenuation
D:-Amplification
Ans: A
6:-A network designed to attenuate certain frequencies and allow other to pass without attenuation is called
A:-Filter
B:-Attenuator
C:-Low noise amplifier
D:-Pre-Amplifier
Ans: A
A:-MASM
B:-MATLAB
C:-MENDELEY
D:-TASM
Ans: B
2:-VHSIC Hardware Description Language is commonly called
A:-VHDL
B:-Verilog HDL
C:-VHSHDL
D:-None of these
Ans: A
3:-In D'Arsonval Movement the torque exerted on the pivoted coil is proportional to the applied
A:-Voltage
B:-Current
C:-Power
D:-Amplitude
Ans: B
4:-LVDT is used to measure
A:-Temperature
B:-Humidity
C:-Displacement
D:-Magnetic Flux
Ans: C
5:-All pass filters are used for
A:-Phase correction
B:-Noise reduction
C:-Attenuation
D:-Amplification
Ans: A
6:-A network designed to attenuate certain frequencies and allow other to pass without attenuation is called
A:-Filter
B:-Attenuator
C:-Low noise amplifier
D:-Pre-Amplifier
Ans: A
7. Which code is used in constructing k-maps?
A) Hamming code B) 2 out of 5 code C) BCD code D) Gray code
Ans: D
8) The current mode logic (CML) is same as
A) LSI B) CMOS C) TTL D) ECL
Ans: D
9) What is the 2's complement of 01101?
A) 10010 B) 10011 C) 1100 D) 1001
Ans: B
10) Which one of the following logic circuit has the highest speed as compared to the currently available logic circuits?
A) Resistance-transistor logic B) Emitter-coupled logic
C) Integrated-injection logic D) Diode-transistor logic
Ans: B
11) The output of a JK flip-flop with asynchronous preset and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditions by applying
A) J = 0, K = 0 and using a clock
B) J = 1, K = 0 and using the clock
C) Asynchronous preset input
D) J = 1, K = 1 and using the clock
Ans: D
12) The contents of EPROM can be erased by exposing it to
A) Ultraviolet rays B) Infrared rays
C) Burst of microwaves D) Intense heat radiations
Ans: A
13) What is the value of susceptibility in case of vacuum?
A) 1
B) 0.5
C) ∞
D) 0
Ans: D
14) A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient?
A) 0.69
B) 1.69
C) 6.9
D) 16.9
Ans: A
15) Which of the following is a non-recursive system?
A) Y (n-1) + 2 Y (n-2)
B) Y (n-3)
C) Y (n) + 2 Y (n+2)
D) 5Y (n-3)
Ans: C
16) What is the steady state error of type-0 system for ramp input?
A) ∞
B) A/K
C) A/(1+K)
D) 0
Ans: A
17) What is the time response of a system whose poles lie on the right hand side of s-plane?
A) Exponentially increasing
B) Exponentially decreasing
C) Sinusoidal oscillations
D) Step response
Ans: A
18) What will happen to the gain margin if the gain of the open loop system is doubled?
A) Doubled
B) Becomes half
C) Is not affected
D) Becomes one-fourth
Ans: B
19) The effect of negative feedback on distortion and bandwidth is
A) Both distortion and bandwidth get decreased
B) Both distortion and bandwidth get increased
C) Distortion is reduced and bandwidth is increased
D) Distortion is increased and bandwidth is decreased
Ans: C
20) Which one of the following is another name for common-collector amplifier?
A) Source follower
B) Collector follower
C) Base follower
D) Emitter follower
Ans: D
21) Which of the following circuits converts any arbitrary waveform into square waveform?
A) Hartley oscillator B) Schmitt trigger
C) Differentiator D) RC phase shift oscillator
Ans: B
22) When does the Body bias effect occur in an n-channel MOSFET?
A) When the Source voltage is less the Bulk voltage
B) When the Source voltage is equal to or greater the Bulk voltage
C) When the Drain voltage is equal to the Bulk voltage
D) When the Gate voltage is equal to the Bulk Voltage
Ans: B
23) What is a Schmitt trigger?
A) A trigger circuit B) A comparator with Hysteresis
C) A comparator without Hysteresis D) Amplifier
Ans: B
24) What is the efficiency of Class-B amplifier?
A) 68.50%
B) 78.50%
C) 88.50%
D) 98.50%
Ans: B
25) A diode in which the change in reverse bias voltage varies the capacitance is called as
A) Varactor diode B) Switching diode
C) Tunnel diode D) Zener-diode
Ans: A
26) The magnetic susceptibility of paramagnetic material is:
A) Less than zero
B) Less than one but positive
C) Greater than one
D) Equal to zero
Ans: B
27) The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V?
A) 100 MHz B) 1 MHz
C) 10 MHz D) 1 kHz
Ans: B
28) In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal
B) Zero
C) Half the number of atoms in the crystal
D) Half the number of free electrons in the crystal
Ans: B
29) If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be
A) 0.98 B) 0.41
C) 59 D) 55
Ans: A
30) A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source?
A) 5.45 Ω
B) 6 Ω
C) 7.2 Ω
D) 6.38 Ω
Ans: A
31) An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is
A) 8.62 V B) 12 V
C) 19.17 V D) 27.11 V
Ans: D
32) Which of the following is NOT a non-linear resistor?
A) Varistor B) Precision resistor
C) NTC thermistor D) PTC thermistor
Ans: B
33) A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain?
A) Ac = 0.125 B) Ac = 0.33
C) Ac = 3 D) Ac = 28
Ans: D
34) The number of terminals present in IGBT is
A) 2
B) 3
C) 4
D) 5
Ans: B
35) How is the GTO turned off?
A) By using a commutation circuit
B) By applying reverse gate pulse
C) By using a latch-up circuit
D) By reverse anode current pulse
Ans: B
36) An inductor is connected in series with SCR to protect it from
A) Excessive high voltage
B) Excessive high dv/dt
C) Excessive high di/dt
D) Excessive large forward current
Ans: C
37) Which of the following thyristors can be used for high frequency of operation?
A) TRIAC B) DIAC
C) SCR D) GTO
Ans: D
38) A resistor in which the resistance changes exponentially with change in temperature is called as
A) Potentiometer B) Phototransistor
C) Varactor D) Thermistor
Ans: D
39) A certain power MOSFET has a maximum junction temperature specification of 1500 deg C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of 600 C/W. If the ambient temperature is 300 deg C, then the maximum allowable power dissipation in the device will be
A) 1.52 W B) 1.72 W
C) 1.92W D) 2.00 W
Ans: D
40) What is the Laplace transform of step signal of 5 units magnitude?
A) 5s
B) 5/s
C) s/5
D) 1/s
Ans: B
41) What is the Fourier transform of a Gaussian time pulse?
A) Uniform B) Gaussian
C) Impulses D) Pulse
Ans: B
42) What does double integration of a unit step function lead to?
A) A doublet B) A ramp
C) An impulse D) A parabola
Ans: D
43) An energy signal has G(f) = 20. Its energy density spectrum is
A) 20 B) 100
C) 400 D) 800
Ans: C
44) The colour band on the extreme left in general purpose fixed resistors represents: A) Tolerance B) First significant digit
C) Wattage Rating D) Voltage Rating
Ans: B
45) The second harmonic distortion is defined as the
A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency
B) Harmonic distortion due to only second harmonic component
C) Sum of distortion of first and second harmonic components in the output
D) Ratio of amplitude of fundamental component in the output to that of second harmonic component at the input
Ans: A
46) As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel which is bandlimited to ‘B’ Hz. The number of samples ‘n’ is given by (symbols/notations carry their usual meaning)
A) B/T
B) T/B
C) 2BT
D) BT/2
Ans: C
47) What is the frequency range of VHF electromagnetic waves?
A) 30-300 kHz
B) 30-3000 kHz
C) 30-300 MHz
D) 30-3000 MHz
Ans: C
48) If a signal band limited to fm is sampled at a rate less than 2fm, then the constructed signal will be
A) Large in amplitude B) Small in amplitude
C) Distorted D) Distortion less
Ans: C
49) An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power?
A) 49.98 W B) 79.98 W
C) 99.96 W D) 199.93 W
Ans: A
50) What is the channel capacity of a noisy channel with conditional probability of error p = 1/2?
A) 0
B) 1
C) Infinity
D) 2
Ans: A
A) Hamming code B) 2 out of 5 code C) BCD code D) Gray code
Ans: D
8) The current mode logic (CML) is same as
A) LSI B) CMOS C) TTL D) ECL
Ans: D
9) What is the 2's complement of 01101?
A) 10010 B) 10011 C) 1100 D) 1001
Ans: B
10) Which one of the following logic circuit has the highest speed as compared to the currently available logic circuits?
A) Resistance-transistor logic B) Emitter-coupled logic
C) Integrated-injection logic D) Diode-transistor logic
Ans: B
11) The output of a JK flip-flop with asynchronous preset and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditions by applying
A) J = 0, K = 0 and using a clock
B) J = 1, K = 0 and using the clock
C) Asynchronous preset input
D) J = 1, K = 1 and using the clock
Ans: D
12) The contents of EPROM can be erased by exposing it to
A) Ultraviolet rays B) Infrared rays
C) Burst of microwaves D) Intense heat radiations
Ans: A
13) What is the value of susceptibility in case of vacuum?
A) 1
B) 0.5
C) ∞
D) 0
Ans: D
14) A 50Ω transmission line is terminated in an impedance of 20-j50. What will be the reflection coefficient?
A) 0.69
B) 1.69
C) 6.9
D) 16.9
Ans: A
15) Which of the following is a non-recursive system?
A) Y (n-1) + 2 Y (n-2)
B) Y (n-3)
C) Y (n) + 2 Y (n+2)
D) 5Y (n-3)
Ans: C
16) What is the steady state error of type-0 system for ramp input?
A) ∞
B) A/K
C) A/(1+K)
D) 0
Ans: A
17) What is the time response of a system whose poles lie on the right hand side of s-plane?
A) Exponentially increasing
B) Exponentially decreasing
C) Sinusoidal oscillations
D) Step response
Ans: A
18) What will happen to the gain margin if the gain of the open loop system is doubled?
A) Doubled
B) Becomes half
C) Is not affected
D) Becomes one-fourth
Ans: B
19) The effect of negative feedback on distortion and bandwidth is
A) Both distortion and bandwidth get decreased
B) Both distortion and bandwidth get increased
C) Distortion is reduced and bandwidth is increased
D) Distortion is increased and bandwidth is decreased
Ans: C
20) Which one of the following is another name for common-collector amplifier?
A) Source follower
B) Collector follower
C) Base follower
D) Emitter follower
Ans: D
21) Which of the following circuits converts any arbitrary waveform into square waveform?
A) Hartley oscillator B) Schmitt trigger
C) Differentiator D) RC phase shift oscillator
Ans: B
22) When does the Body bias effect occur in an n-channel MOSFET?
A) When the Source voltage is less the Bulk voltage
B) When the Source voltage is equal to or greater the Bulk voltage
C) When the Drain voltage is equal to the Bulk voltage
D) When the Gate voltage is equal to the Bulk Voltage
Ans: B
23) What is a Schmitt trigger?
A) A trigger circuit B) A comparator with Hysteresis
C) A comparator without Hysteresis D) Amplifier
Ans: B
24) What is the efficiency of Class-B amplifier?
A) 68.50%
B) 78.50%
C) 88.50%
D) 98.50%
Ans: B
25) A diode in which the change in reverse bias voltage varies the capacitance is called as
A) Varactor diode B) Switching diode
C) Tunnel diode D) Zener-diode
Ans: A
26) The magnetic susceptibility of paramagnetic material is:
A) Less than zero
B) Less than one but positive
C) Greater than one
D) Equal to zero
Ans: B
27) The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V?
A) 100 MHz B) 1 MHz
C) 10 MHz D) 1 kHz
Ans: B
28) In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal
B) Zero
C) Half the number of atoms in the crystal
D) Half the number of free electrons in the crystal
Ans: B
29) If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be
A) 0.98 B) 0.41
C) 59 D) 55
Ans: A
30) A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source?
A) 5.45 Ω
B) 6 Ω
C) 7.2 Ω
D) 6.38 Ω
Ans: A
31) An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is
A) 8.62 V B) 12 V
C) 19.17 V D) 27.11 V
Ans: D
32) Which of the following is NOT a non-linear resistor?
A) Varistor B) Precision resistor
C) NTC thermistor D) PTC thermistor
Ans: B
33) A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain?
A) Ac = 0.125 B) Ac = 0.33
C) Ac = 3 D) Ac = 28
Ans: D
34) The number of terminals present in IGBT is
A) 2
B) 3
C) 4
D) 5
Ans: B
35) How is the GTO turned off?
A) By using a commutation circuit
B) By applying reverse gate pulse
C) By using a latch-up circuit
D) By reverse anode current pulse
Ans: B
36) An inductor is connected in series with SCR to protect it from
A) Excessive high voltage
B) Excessive high dv/dt
C) Excessive high di/dt
D) Excessive large forward current
Ans: C
37) Which of the following thyristors can be used for high frequency of operation?
A) TRIAC B) DIAC
C) SCR D) GTO
Ans: D
38) A resistor in which the resistance changes exponentially with change in temperature is called as
A) Potentiometer B) Phototransistor
C) Varactor D) Thermistor
Ans: D
39) A certain power MOSFET has a maximum junction temperature specification of 1500 deg C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of 600 C/W. If the ambient temperature is 300 deg C, then the maximum allowable power dissipation in the device will be
A) 1.52 W B) 1.72 W
C) 1.92W D) 2.00 W
Ans: D
40) What is the Laplace transform of step signal of 5 units magnitude?
A) 5s
B) 5/s
C) s/5
D) 1/s
Ans: B
41) What is the Fourier transform of a Gaussian time pulse?
A) Uniform B) Gaussian
C) Impulses D) Pulse
Ans: B
42) What does double integration of a unit step function lead to?
A) A doublet B) A ramp
C) An impulse D) A parabola
Ans: D
43) An energy signal has G(f) = 20. Its energy density spectrum is
A) 20 B) 100
C) 400 D) 800
Ans: C
44) The colour band on the extreme left in general purpose fixed resistors represents: A) Tolerance B) First significant digit
C) Wattage Rating D) Voltage Rating
Ans: B
45) The second harmonic distortion is defined as the
A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency
B) Harmonic distortion due to only second harmonic component
C) Sum of distortion of first and second harmonic components in the output
D) Ratio of amplitude of fundamental component in the output to that of second harmonic component at the input
Ans: A
46) As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel which is bandlimited to ‘B’ Hz. The number of samples ‘n’ is given by (symbols/notations carry their usual meaning)
A) B/T
B) T/B
C) 2BT
D) BT/2
Ans: C
47) What is the frequency range of VHF electromagnetic waves?
A) 30-300 kHz
B) 30-3000 kHz
C) 30-300 MHz
D) 30-3000 MHz
Ans: C
48) If a signal band limited to fm is sampled at a rate less than 2fm, then the constructed signal will be
A) Large in amplitude B) Small in amplitude
C) Distorted D) Distortion less
Ans: C
49) An SSB transmitter produces a peak-to-peak voltage of 200 V across a 100 Ω antenna load. What is the Peak Envelope Power?
A) 49.98 W B) 79.98 W
C) 99.96 W D) 199.93 W
Ans: A
50) What is the channel capacity of a noisy channel with conditional probability of error p = 1/2?
A) 0
B) 1
C) Infinity
D) 2
Ans: A
51) As per information capacity theorem, what is the capacity of channel of bandwidth ‘B’ Hz, perturbed by AWGN of PSD N0/2, limited in bandwidth to ‘B’ and transmitted power of ‘P’? (symbols/notations carry their usual meaning)
A) C = log2(P+B)
B) C = B log2(1+P/N0B)
C) C = B log2(P/N0B)+1
D) C = 2*B
Ans: B
52) Which waves are demodulated by Costas loop?
A) VSB B) SSB
C) MSK D) DSBSC
Ans: D
53) The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is
A) 50 W B) 66 W
C) 68 W D) 70 W
Ans: B
54) For a NAND gate, when one or more inputs are low then the output will be A) Low B) High C) Alternately high and low
D) High or low depending on relative magnitude of inputs
Ans: B
55) What is the size of SP register in 8085 microprocessor?
A) 16 bits B) 8 bits
C) 64 bits D) 48 bits
Ans: A
56) What is the size of memory which can be accessed by direct accessing in 8085 microprocessor?
A) 64 kB B) 4 kB
C) 128 kB D) 128 MB
Ans: A
57) What is the Power Supply specification for 8085AH microprocessor?
A) Single +5V supply with 10% voltage margins
B) Dual +5V supply with 10% voltage margins
C) Single +10V supply with 5% voltage margins
D) Dual +5V supply with 5% voltage margins
Ans: A
58) Which of the following memory is a volatile memory?
A) ROM B) PROM
C) EEPROM D) RAM
Ans: D
59) In 8085, whenever a signal is received at TRAP terminal, its program execution is transferred to a subroutine on address
A) 0000 H B) 002C H
C) 0024 H D) 0004 H
Ans: C
60) Then number of T-states of the instruction STA in 8085 microprocessor is
A) 10 B) 12
C) 13 D) 16
Ans: C
61) The command line interpreter that enables the users to interact with operating system is called the
A) Window B) Shell
C) Process D) Kernel
Ans: B
62) The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as
A) Turnaround time B) Latency time
C) Access time D) Response time
Ans: C
63) In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)?
A) 4 to 6 B) 3 to 8
C) 2 to 3 D) 8 to 12
Ans: A
64) Calculate the size of memory address space for a 16 bit data and 20 bit address bus.
A) 1 MB B) 2 MB
C) 3 MB D) 4 MB
Ans: A
65) The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully?
A) 5.6 µs B) 5.7 µs
C) 5.8 µs D) 5.9 µs
Ans: C
66) In the 8085A Microprocessor, arithmetic and logical operations are performed through which of the following?
A) Stack B) ALU
C) I/O D) Register
Ans: B
67) In a 16-bit microprocessor, a single word is
A) 16 bit data B) 32 bit data
C) 8 bit data D) 64 bit data
Ans: A
68) What are the components of system bus?
A) CPU Bus, Address Bus, Data Bus B) Memory, Control Unit, ALU
C) Data Bus, Address Bus, Control Bus D) Register, PC, IR
Ans: C
69) The 8085 Microprocessor has
A) 8-bits Data bus and 16-bits Address bus
B) 8-bits Data bus and 8-bits Address bus
C) 16-bits Data bus and 16-bits Address bus
D) 32-bits Data bus and 8-bits Address bus
Ans: A
70) Which of the following is a negative-resistance microwave device for oscillator applications?
A) IMPATT Diode B) Gunn Diode
C) Snap diode D) Schottky Diode
Ans: B
71) Which of the following device is used for coupling microwave energy?
A) Resonator
B) Waveguide
C) Loop
D) Antenna
Ans: C
72) TWT is basically a(n)
A) Amplifier
B) An oscillator
C) Wideband amplifier
D) Tuned amplifier
Ans: C
73) A waveguide termination having VSWR of 1.1 is used to dissipate 100 watts of power. The reflected power will be
A) 0.2268 W B) 0.5868 W
C) 0.3468 W D) 0.4568 W
Ans: A
74) Which of the following transducers can be used for non-contact temperature measurement? A) Resistance temperature detector B) Thermistor
C) Sensistor D) Pyrometer
Ans: D
75) The nodal method of circuit analysis is based on
A) KVL and Ohm’s law B) KCL and Ohm’s law
C) KVL and KCL D) KCL, KVL and Ohm’s law
Ans: B
76) A connected graph has ‘5’ number of branches and ‘4’ number of nodes. It's rank is
A) 1
B) 2
C) 3
D) 4
Ans: C
77) Which of the following materials is used in the construction of thermistors? A) Pure metal
B) Pure semiconductor
C) Pure insulator
D) Sintered mixture of metal oxides
Ans: D
78) An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when
A) ZL = R
B) ZL = jXS
C) ZL = R-jXS
D) ZL = R+jXS
Ans: C
79) The number of loop equations required to completely analysing a network comprising of 8 independent branches and 6 nodes including the reference node shall be
A) 3
B) 2
C) 4
D) 5
Ans: A
80) Which of the following instruments can be used for measurement of very high value resistances such as insulation resistance in industries? A) Wheatstone bridge B) Megger
C) Ohm-meter D) Resistive potentiometer
Ans: B
81) RADAR is an acronym for:
A) Radio Detection and Repulsion B) Radio Device and Ranging
C) Radio Detection and Ranging D) Ranging Detection and Retrieve
Ans: C
82) The ratio of the width to the height of the picture frame is called as
A) Rastar B) Aspect Ratio
C) Length Ratio D) Efficiency
Ans: B
83) If it takes a transmitted signal 1m sec to go up to the target and come back after reflection, how far is the transmitter from the target?
A) 150 Km B) 150 m
C) 15 Km D) 1500 m
Ans: A
84) A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz centred around 1 GHz. The range resolution capability of this radar is
A) 7.5 m B) 7.5 Km
C) 75 m D) 750 m
Ans: A
85) A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar?
A) 5 Km B) 5 m
C) 50 Km D) 15 m
Ans: C
86) In thermo-couple instruments, in which of the following is an emf caused if the junction of two wires of dissimilar metals is heated and the free or cold ends are connected to a milli-voltmeter?
A) Kelvin effect B) Hot wire effect
C) Seebeck effect D) Faraday effect
Ans: C
87) The largest change of input quantity for which there is no output of the instrument is called as
A) Dead time of that instrument
B) Live zone of that instrument
C) Dead zone of that instrument
D) Discrimination of that instrument
Ans: C
88:-LNB stands for A:-Less noisy block B:-Low noise block C:-Left norm balloon D:-Linear norm block Ans: B
89:-The set top receivers output lies in the frequency band of A:-30 to 300 MHz B:-300 to 3000 MHz C:-600 to 900 MHz D:-900 to 1400 MHz Ans: D
90:-A transponder is a _ A:-Sort of transmitter B:-Sort of relay station C:-Frequency channel used by a satellite station D:-None of the above Ans: C
91:-A CCTV security system installed in border areas for day and night watch contains a _ CCTV camera A:-Infrared B:-Day and night C:-Dome D:-PTZ Ans: A
92:-The output of a CCTV camera should be A:-0.1 V P-P B:-1.0 V P-P C:-10 V P-P D:-5 V P-P Ans: B
93:-The smallest size CCTV camera is A:-Dome type B:-Bu||et type C:-PTZ type D:-Outdoor type Ans: B
94:-In DTH system a _ is necessary in addition to dish antennae and cable etc
A:-LNA B:-LNB C:-Set top receiver D:-Transponder
Ans: C
95:-For watching intruders during totally dark time a CCTV camera is associated with
A:-Search light B:-Halogen lamp Cz-CCFL D:-IR LED
Ans: D
96:-Magnetron is an / a _
A:-Amp|ifier B:-Oscillator C:-Multivibrator D:-Chopper
Ans: B
97:-induction heating is a type of_____ heating
A:-A zero frequency B:-High frequency C:-Power frequency D:-None of the above
Ans: B
98:-Forced commutations requires
A:-A pre charged inductor B:-A pre charged capacitor C:-An over damped RLC load D:-A very high frequency AC source
Ans: B
99:-Which part of microwave oven generates micro waves
A:-A generator B:-Magnetron C:-Meta| mesh D:-Booster
Ans: B
100:-Application of cyc|oconverters include
A:-Speed control of AC drive B:-Induction heating C:-Static VAr compensation D:-All of the mentioned
Ans: D
A) C = log2(P+B)
B) C = B log2(1+P/N0B)
C) C = B log2(P/N0B)+1
D) C = 2*B
Ans: B
52) Which waves are demodulated by Costas loop?
A) VSB B) SSB
C) MSK D) DSBSC
Ans: D
53) The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is
A) 50 W B) 66 W
C) 68 W D) 70 W
Ans: B
54) For a NAND gate, when one or more inputs are low then the output will be A) Low B) High C) Alternately high and low
D) High or low depending on relative magnitude of inputs
Ans: B
55) What is the size of SP register in 8085 microprocessor?
A) 16 bits B) 8 bits
C) 64 bits D) 48 bits
Ans: A
56) What is the size of memory which can be accessed by direct accessing in 8085 microprocessor?
A) 64 kB B) 4 kB
C) 128 kB D) 128 MB
Ans: A
57) What is the Power Supply specification for 8085AH microprocessor?
A) Single +5V supply with 10% voltage margins
B) Dual +5V supply with 10% voltage margins
C) Single +10V supply with 5% voltage margins
D) Dual +5V supply with 5% voltage margins
Ans: A
58) Which of the following memory is a volatile memory?
A) ROM B) PROM
C) EEPROM D) RAM
Ans: D
59) In 8085, whenever a signal is received at TRAP terminal, its program execution is transferred to a subroutine on address
A) 0000 H B) 002C H
C) 0024 H D) 0004 H
Ans: C
60) Then number of T-states of the instruction STA in 8085 microprocessor is
A) 10 B) 12
C) 13 D) 16
Ans: C
61) The command line interpreter that enables the users to interact with operating system is called the
A) Window B) Shell
C) Process D) Kernel
Ans: B
62) The average time required to reach a storage location in the memory to read or retrieve the contents of memory is called as
A) Turnaround time B) Latency time
C) Access time D) Response time
Ans: C
63) In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)?
A) 4 to 6 B) 3 to 8
C) 2 to 3 D) 8 to 12
Ans: A
64) Calculate the size of memory address space for a 16 bit data and 20 bit address bus.
A) 1 MB B) 2 MB
C) 3 MB D) 4 MB
Ans: A
65) The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully?
A) 5.6 µs B) 5.7 µs
C) 5.8 µs D) 5.9 µs
Ans: C
66) In the 8085A Microprocessor, arithmetic and logical operations are performed through which of the following?
A) Stack B) ALU
C) I/O D) Register
Ans: B
67) In a 16-bit microprocessor, a single word is
A) 16 bit data B) 32 bit data
C) 8 bit data D) 64 bit data
Ans: A
68) What are the components of system bus?
A) CPU Bus, Address Bus, Data Bus B) Memory, Control Unit, ALU
C) Data Bus, Address Bus, Control Bus D) Register, PC, IR
Ans: C
69) The 8085 Microprocessor has
A) 8-bits Data bus and 16-bits Address bus
B) 8-bits Data bus and 8-bits Address bus
C) 16-bits Data bus and 16-bits Address bus
D) 32-bits Data bus and 8-bits Address bus
Ans: A
70) Which of the following is a negative-resistance microwave device for oscillator applications?
A) IMPATT Diode B) Gunn Diode
C) Snap diode D) Schottky Diode
Ans: B
71) Which of the following device is used for coupling microwave energy?
A) Resonator
B) Waveguide
C) Loop
D) Antenna
Ans: C
72) TWT is basically a(n)
A) Amplifier
B) An oscillator
C) Wideband amplifier
D) Tuned amplifier
Ans: C
73) A waveguide termination having VSWR of 1.1 is used to dissipate 100 watts of power. The reflected power will be
A) 0.2268 W B) 0.5868 W
C) 0.3468 W D) 0.4568 W
Ans: A
74) Which of the following transducers can be used for non-contact temperature measurement? A) Resistance temperature detector B) Thermistor
C) Sensistor D) Pyrometer
Ans: D
75) The nodal method of circuit analysis is based on
A) KVL and Ohm’s law B) KCL and Ohm’s law
C) KVL and KCL D) KCL, KVL and Ohm’s law
Ans: B
76) A connected graph has ‘5’ number of branches and ‘4’ number of nodes. It's rank is
A) 1
B) 2
C) 3
D) 4
Ans: C
77) Which of the following materials is used in the construction of thermistors? A) Pure metal
B) Pure semiconductor
C) Pure insulator
D) Sintered mixture of metal oxides
Ans: D
78) An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when
A) ZL = R
B) ZL = jXS
C) ZL = R-jXS
D) ZL = R+jXS
Ans: C
79) The number of loop equations required to completely analysing a network comprising of 8 independent branches and 6 nodes including the reference node shall be
A) 3
B) 2
C) 4
D) 5
Ans: A
80) Which of the following instruments can be used for measurement of very high value resistances such as insulation resistance in industries? A) Wheatstone bridge B) Megger
C) Ohm-meter D) Resistive potentiometer
Ans: B
81) RADAR is an acronym for:
A) Radio Detection and Repulsion B) Radio Device and Ranging
C) Radio Detection and Ranging D) Ranging Detection and Retrieve
Ans: C
82) The ratio of the width to the height of the picture frame is called as
A) Rastar B) Aspect Ratio
C) Length Ratio D) Efficiency
Ans: B
83) If it takes a transmitted signal 1m sec to go up to the target and come back after reflection, how far is the transmitter from the target?
A) 150 Km B) 150 m
C) 15 Km D) 1500 m
Ans: A
84) A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz centred around 1 GHz. The range resolution capability of this radar is
A) 7.5 m B) 7.5 Km
C) 75 m D) 750 m
Ans: A
85) A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar?
A) 5 Km B) 5 m
C) 50 Km D) 15 m
Ans: C
86) In thermo-couple instruments, in which of the following is an emf caused if the junction of two wires of dissimilar metals is heated and the free or cold ends are connected to a milli-voltmeter?
A) Kelvin effect B) Hot wire effect
C) Seebeck effect D) Faraday effect
Ans: C
87) The largest change of input quantity for which there is no output of the instrument is called as
A) Dead time of that instrument
B) Live zone of that instrument
C) Dead zone of that instrument
D) Discrimination of that instrument
Ans: C
88:-LNB stands for A:-Less noisy block B:-Low noise block C:-Left norm balloon D:-Linear norm block Ans: B
89:-The set top receivers output lies in the frequency band of A:-30 to 300 MHz B:-300 to 3000 MHz C:-600 to 900 MHz D:-900 to 1400 MHz Ans: D
90:-A transponder is a _ A:-Sort of transmitter B:-Sort of relay station C:-Frequency channel used by a satellite station D:-None of the above Ans: C
91:-A CCTV security system installed in border areas for day and night watch contains a _ CCTV camera A:-Infrared B:-Day and night C:-Dome D:-PTZ Ans: A
92:-The output of a CCTV camera should be A:-0.1 V P-P B:-1.0 V P-P C:-10 V P-P D:-5 V P-P Ans: B
93:-The smallest size CCTV camera is A:-Dome type B:-Bu||et type C:-PTZ type D:-Outdoor type Ans: B
94:-In DTH system a _ is necessary in addition to dish antennae and cable etc
A:-LNA B:-LNB C:-Set top receiver D:-Transponder
Ans: C
95:-For watching intruders during totally dark time a CCTV camera is associated with
A:-Search light B:-Halogen lamp Cz-CCFL D:-IR LED
Ans: D
96:-Magnetron is an / a _
A:-Amp|ifier B:-Oscillator C:-Multivibrator D:-Chopper
Ans: B
97:-induction heating is a type of_____ heating
A:-A zero frequency B:-High frequency C:-Power frequency D:-None of the above
Ans: B
98:-Forced commutations requires
A:-A pre charged inductor B:-A pre charged capacitor C:-An over damped RLC load D:-A very high frequency AC source
Ans: B
99:-Which part of microwave oven generates micro waves
A:-A generator B:-Magnetron C:-Meta| mesh D:-Booster
Ans: B
100:-Application of cyc|oconverters include
A:-Speed control of AC drive B:-Induction heating C:-Static VAr compensation D:-All of the mentioned
Ans: D
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