ELECTRONIC SCIENCE-PAGE 4
ELECTRONIC SCIENCE MCQs
1. In intrinsic semiconductor
(A) The electron density is twice the whole density
(B) The electron density is thrice the whole density
(C) The electron density is square root of the whole density
(D) The electron density is same as the whole density
Ans: D
2. PN junction diode can be used as a/an
(A) Oscillator
(B) Amplifier
(C) Insulator
(D) Rectifier
Ans: D
3. Norton’s equivalent form in any complex impedance circuit consists of
(A) An equivalent current source in parallel with an equivalent resistance.
(B) An equivalent voltage source in series with an equivalent resistance.
(C) An equivalent current source in parallel with equivalent impedance.
(D) An equivalent voltage source in series with equivalent impedance.
Ans: C
4. Zener diode is a
(A) Reverse biased diode
(B) Variable voltage source
(C) Constant current source
(D) Forward biased diode
Ans: A
5. Which of the following oscillator make use of both positive and negative feedbacks?
(A) Hartley oscillator
(B) Colpit’s oscillator
(C) Phase shift oscillator
(D) Wein-Bridge oscillator
Ans: D
6. Superposition theorem can be applied only to circuits having
(A) Resistive elements
(B) Passive elements
(C) no-linear elements
(D) Linear bilateral elements
Ans: D
7. Identify the fastest analogue to digital converter
(A) Ramp conversion
(B) Parallel conversion
(C) Successive approximation
(D) Dual-slope integration
Ans: B
8. 1 K memory device contain
(A) 1064 memory cells
(B) 1024 memory cells
(C) 512 memory cells
(D) 640 memory cells
Ans: B
9. Which of the following circuit comes under the class of sequential logic circuits?
(A) Multiplexer
(B) RS Latch
(C) Full Adder
(D) ROM
Ans: B
10. The Hamming code for 0110 using even parity is
(A) 0010110
(B) 1010110
(C) 1100110
(D) 1110110
Ans: C
11. Phase Lock Loop (PLL) system is used for the detection of
(A) PM
(B) AM
(C) FM
(D) QAM
Ans: C
12. A transistor amplifier has a measured S/N of 10 at its input and 5 at its output. The transistor’s Noise Figure (NF) in dB is
(A) 2 dB
(B) 3 dB
(C) 6 dB
(D) 10 dB
Ans: B
13. A signal varies from 20 Hz to 5 KHz is passed using pulse modulation scheme. Minimum sampling rate and number of channels that could be accommodated using TDM (assume each sample takes 10 μs) respectively will be
(A) 5 KHz, 5
(B) 10 KHz, 5
(C) 5 KHz, 10
(D) 10 KHz, 10
Ans: D
14. The term (1/jw) on the log-magnitude plot has a slope of
(A) – 20 dB/decade
(B) + 20 dB/decade
(C) – 40 dB/decade
(D) + 40 dB/decade
Ans: A
15. In LED, light is emitted, because
(A) Diode emits light when gets heated.
(B) Recombination of charge carrier takes place.
(C) Light is made to reflect due to lens action.
(D) LED amplifies the light falling on it.
Ans: B
16. Zener breakdown mechanism occurs in reverse biased PN junction
(A) When P and N regions are lightly doped.
(B) When P and N regions are heavily doped.
(C) Are of silicon material only.
(D) When P and N regions are equally doped.
Ans: B
17. The operation of a Photo-diode involves
(A) Photo-conductive effect
(B) Photo-voltaic effect
(C) Photo-emissive effect
(D) Photo-multiplicative effect
Ans: C
18. The data can be transmitted d by following means:
1. Coaxial cables
2. MMF
3. SMF
4. Twisted wire cable
The correct sequence in the increasing order of Bandwidth is
(A) 2, 3, 1, 4
(B) 4, 1, 2, 3
(C) 4, 1, 3, 2
(D) 1, 4, 2, 3
Ans: B
19. The triggered voltage of a SCR is close to
(A) 0.3 V
(B) 0.7 V
(C) 3 V
(D) Breakdown voltage
Ans: B
20. A thyristor can be used as
(A) An amplifier
(B) A resistor
(C) A switch
(D) A power source
Ans: C
21. Which of the following is an advantage to use fiber optic data transmission?
(A) Resistance to the data theft
(B) Fast data transmission rate
(C) Low noise level
(D) All of the above
Ans: D
22. A breakdown which is caused by cumulative multiplication of carriers through field induced impact ionization occurs in
(A) Avalanche diode
(B) Tunnel diode
(C) Varactor diode
(D) Gunn diode
Ans: A
23. Transfer function of a system is necessary for the calculation of
(A) The time constant
(B) The output for a given input
(C) The steady state gain
(D) The order of the system
Ans: B
24. If one or more pairs of simple roots are located on imaginary axis of the s-plane but there are no roots in the right half of s-plane, the response due to initial condition will
(A) Decrease to zero as time approaches infinity.
(B) Increase as time approaches infinity.
(C) Be undamped sinusoidal oscillations.
(D) Be damped unsinusoidal oscillation and the damping factor will depend upon the relative location of the roots on the imaginary axis.
Ans: C
25. 8255A Programmable Peripheral Interface IC has got the 24 I/O lines in the following way (General form):
(A) Port A with 8 input lines, Port B with 8 output lines, Port C (upper nibble) with 4 input lines and Port C (lower nibble) with 4 output lines.
(B) Port A with 8 input/out lines, Port B with 8 input lines and Port C with 8 output lines.
(C) Port A with 8 input lines, Port B with 8 output lines and Port C with 8 bits as either input or output lines.
(D) Port A with 8 lines as input/output lines, Port B with 8 lines as input/output lines, Port C (lower nibble) with 4 lines as input/output lines. Port C (upper nibble) with 4 lines as input/output lines.
Ans: D
26. The Refractive Index of core in optical fibre should be
(A) Smaller than R.I. of cladding
(B) greater than R.I. of cladding
(C) Equal to R.I. of cladding
(D) Equal to air
Ans: B
27. Consider the following conditional expression z = (x > y)? x: y; if x = 2 and y = 8, the value of z is
(A) 2
(B) 8
(C) 6
(D) 10
Ans: B
28. int Net = 0;
if x < 50
if (y > 5)
Net = x + y;
else
Net = x – y;
For this C program segment, x = 55 and y = 5, then the value Net is
(A) 0
(B) 60
(C) 50
(D) 55
Ans: A
29. In 8253 programmable interval timer, in which modes, the counting is neither enabled nor disabled?
(A) 0 and 4
(B) 1 and 5
(C) 1 and 4
(D) 3 and 5
Ans: B
30. In which mode of 8259A programmable interrupt controller, all the Interrupt Requests (IRs) are arranged from highest to lowest with IR0 as the highest and IR1 as the lowest?
(A) Fully Nested Mode
(B) Automatic Rotation Mode
(C) Specific Rotation Mode
(D) Simple Rotation Mode
Ans: A
31. Which of the following logic family is fastest of all?
(A) TTL
(B) RTL
(C) DCTL
(D) ECL
Ans: D
32. In an OPAMP, following characteristics are given:
1. PSRR (Power Supply Rejection Ratio) = 0
2. Thermal Drift is defined in terms of μ Amperes/°C.
3. Thermal drift is defined in terms of μV/°C.
4. Slew rate is defined in terms of V/μs.
Which one of the following is correct?
(A) 1 and 2 only
(B) 1 and 3 only
(C) 1, 3 and 4
(D) 1, 2 and 4
Ans: C
33. Consider the following statement:
(i) A flip-flop is used to store 1-bit of information.
(ii) Race-around condition occurs in J-K flip-flop when both the inputs are 1.
(iii) Master-slave configuration is used in flip-flop to store 2-bits of information.
(iv) A transparent latch consists of D type flip-flop.
Which of the following statements is/are true?
(A) (i) only
(B) (i), (iii) and (iv)
(C) (i), (ii) and (iv)
(D) (ii) and (iii) only
Ans: C
34. An AM demodulator can be implemented with
(i) A linear multiplier followed by a low pass filter.
(ii) A linear multiplier followed by a high-pass filter.
(iii) A diode followed by low pass filter.
(iv) A linear multiplier followed byband-stop filter.
The correct answer is:
(A) (i) only
(B) (iii) only
(C) (i) and (iii)
(D) (iv) only
Ans: C
35. In feedback control system, relative stability can be calculated using
(i) Routh-Hurwitz Array
(ii) Nyquist plot
(iii) Polar plot
(iv) Root Locus Techniques
Correct answer is
(A) All of the above
(B) (i) and (ii) only
(C) (ii) and (iv) only
(D) (ii), (iii) and (iv)
Ans: C
36. In comparison to LED, LASER has
1. High emission frequency.
2. No tuning arrangement.
3. Wide spectral bandwidth.
4. Provision for confinement.
Of these statements:
(A) 1, 2 & 4 are correct.
(B) 1, 2, & 3 are correct.
(C) 1 & 4 are correct.
(D) 2 & 3 are correct.
Ans: C
37. The turn-off time of an SCR can be reduced by
1. Quick withdrawal of the gate voltage.
2. Reducing life-time by doping with gold.
3. Applying a negative voltage pulse to the gate.
Of these statements:
(A) 1, 2 and 3 are correct.
(B) 1 and 2 are correct.
(C) 1 and 3 are correct.
(D) 2 and 3 are correct.
Ans: D
38. Consider the following statements regarding a semiconductor:
1. Acceptor level lies close to the valence band.
2. Donor level lies close to the valence band.
3. n-type semiconductor behaves as a conductor at zero Kelvin.
4. p-type semiconductor behaves as an insulator at zero Kelvin.
Of these statements:
(A) 2 and 3 are correct.
(B) 1 and 3 are correct.
(C) 1 and 4 are correct.
(D) 3 and 4 are correct
Ans: C
39. Transfer function for a control system is defined for where
(i) Linear system
(ii) Nonlinear system
(iii) Time invariant system
(iv) Time variant system
(A) (i) and (iii)
(B) (ii) and (iv)
(C) (i) and (iv)
(D) (ii) and (iii)
Ans: A
40. Tri state Buffers provide
(i) Reduction of current consumption in the circuit.
(ii) Isolation from input to output.
(iii) High impedance during OFF state.
(iv) Low impedance during ON state.
(A) (i) and (iv)
(B) (ii) and (iv)
(C) (i) and (ii)
(D) (i) and (iii)
Ans: D
41. Consider the following:
1. CE stage
2. CC stage
3. OP amp
4. CB stage
The correct sequence of the input impedance in increasing order is:
(A) 4, 1, 2, 3
(B) 1, 4, 2, 3
(C) 1, 2, 4, 3
(D) 4, 2, 1, 3
Ans: A
42. The various components in super heterodyne receiver is arranged as
(i) AM Detector
(ii) Mixer
(iii) RF Amplifier
(iv) AF Amplifier
The correct sequence is
(A) (iii), (ii), (i), (iv)
(B) (i), (ii), (iv), (iii)
(C) (iii), (ii), (iv), (i)
(D) (ii), (i), (iii), (iv)
Ans: A
43. The figure of merit of logic family is given by
(A) Gain bandwidth product
(B) (Propagation delay time) × (power dissipation)
(C) (Fan out) × (propagation delay time)
(D) (Noise margin) × (power dissipation)
Ans: B
44. Arrange in ascending order the following logic families based on power delay products
(i) ECL
(ii) TTL
(iii) CMOS
Codes:
(A) (ii), (iii), (i)
(B) (ii), (i), (iii)
(C) (i), (ii), (iii)
(D) (iii), (ii), (i)
Ans: A
45. Consider the following four common type of transistors:
1. Point Contact Transistor
2. Bipolar Junction Transistor
3. MOS Field Effect Transistor
4. Junction Field Effect Transistor
Correct arrangement of these transistors in the increasing order of input impedance is
(A) 1, 2, 4, 3
(B) 1, 2, 3, 4
(C) 2, 1, 3, 4
(D) 2, 1, 4, 3
Ans: D
46. If the various logic families are arranged in the ascending order of their fan-out capabilities, the sequence will be
(A) TTL, DTL, ECL, MOS
(B) DTL, TTL, MOS, ECL
(C) MOS, DTL, TTL, ECL
(D) ECL, TTL, DTL, MOS
Ans: C
47. Consider the following waves/rays:
1. UV Rays
2. X Rays
3. Visible light
4. UHF waves
The correct sequence of the descending order in terms of frequency is:
(A) 3, 1, 2, 4
(B) 4, 3, 1, 2
(C) 2, 1, 3, 4
(D) 2, 4, 1, 3
Ans: C
48. In the Assembly program, the following steps are to be followed. Find the sequence in which the program to be written for 8085 microprocessor.
(i) Initialization of variables.
(ii) Initialization of stack.
(iii) Enable or disable interrupts.
(iv) Program should be completed with last line as ‘END’ statement.
(A) (i), (iii), (ii) and (iv)
(B) (i), (ii), (iii) and (iv)
(C) (ii), (i), (iii) and (iv)
(D) (ii), (iii), (i) and (iv)
Ans: C
49. In a 8085 microprocessor, the resistor which holds address of the next instruction to be fetched is
(A) Accumulator
(B) Program counter
(C) Stack pointer
(D) Instructor Register
Ans: B
50. If a carrier modulated by a digital bit stream had one of the possible phases of 0, 90, 180 and 270 degrees then modulation is called
(A) BPSK
(B) FSK
(C) QPSK
(D) QAM
Ans: C
(A) The electron density is twice the whole density
(B) The electron density is thrice the whole density
(C) The electron density is square root of the whole density
(D) The electron density is same as the whole density
Ans: D
2. PN junction diode can be used as a/an
(A) Oscillator
(B) Amplifier
(C) Insulator
(D) Rectifier
Ans: D
3. Norton’s equivalent form in any complex impedance circuit consists of
(A) An equivalent current source in parallel with an equivalent resistance.
(B) An equivalent voltage source in series with an equivalent resistance.
(C) An equivalent current source in parallel with equivalent impedance.
(D) An equivalent voltage source in series with equivalent impedance.
Ans: C
4. Zener diode is a
(A) Reverse biased diode
(B) Variable voltage source
(C) Constant current source
(D) Forward biased diode
Ans: A
5. Which of the following oscillator make use of both positive and negative feedbacks?
(A) Hartley oscillator
(B) Colpit’s oscillator
(C) Phase shift oscillator
(D) Wein-Bridge oscillator
Ans: D
6. Superposition theorem can be applied only to circuits having
(A) Resistive elements
(B) Passive elements
(C) no-linear elements
(D) Linear bilateral elements
Ans: D
7. Identify the fastest analogue to digital converter
(A) Ramp conversion
(B) Parallel conversion
(C) Successive approximation
(D) Dual-slope integration
Ans: B
8. 1 K memory device contain
(A) 1064 memory cells
(B) 1024 memory cells
(C) 512 memory cells
(D) 640 memory cells
Ans: B
9. Which of the following circuit comes under the class of sequential logic circuits?
(A) Multiplexer
(B) RS Latch
(C) Full Adder
(D) ROM
Ans: B
10. The Hamming code for 0110 using even parity is
(A) 0010110
(B) 1010110
(C) 1100110
(D) 1110110
Ans: C
11. Phase Lock Loop (PLL) system is used for the detection of
(A) PM
(B) AM
(C) FM
(D) QAM
Ans: C
12. A transistor amplifier has a measured S/N of 10 at its input and 5 at its output. The transistor’s Noise Figure (NF) in dB is
(A) 2 dB
(B) 3 dB
(C) 6 dB
(D) 10 dB
Ans: B
13. A signal varies from 20 Hz to 5 KHz is passed using pulse modulation scheme. Minimum sampling rate and number of channels that could be accommodated using TDM (assume each sample takes 10 μs) respectively will be
(A) 5 KHz, 5
(B) 10 KHz, 5
(C) 5 KHz, 10
(D) 10 KHz, 10
Ans: D
14. The term (1/jw) on the log-magnitude plot has a slope of
(A) – 20 dB/decade
(B) + 20 dB/decade
(C) – 40 dB/decade
(D) + 40 dB/decade
Ans: A
15. In LED, light is emitted, because
(A) Diode emits light when gets heated.
(B) Recombination of charge carrier takes place.
(C) Light is made to reflect due to lens action.
(D) LED amplifies the light falling on it.
Ans: B
16. Zener breakdown mechanism occurs in reverse biased PN junction
(A) When P and N regions are lightly doped.
(B) When P and N regions are heavily doped.
(C) Are of silicon material only.
(D) When P and N regions are equally doped.
Ans: B
17. The operation of a Photo-diode involves
(A) Photo-conductive effect
(B) Photo-voltaic effect
(C) Photo-emissive effect
(D) Photo-multiplicative effect
Ans: C
18. The data can be transmitted d by following means:
1. Coaxial cables
2. MMF
3. SMF
4. Twisted wire cable
The correct sequence in the increasing order of Bandwidth is
(A) 2, 3, 1, 4
(B) 4, 1, 2, 3
(C) 4, 1, 3, 2
(D) 1, 4, 2, 3
Ans: B
19. The triggered voltage of a SCR is close to
(A) 0.3 V
(B) 0.7 V
(C) 3 V
(D) Breakdown voltage
Ans: B
20. A thyristor can be used as
(A) An amplifier
(B) A resistor
(C) A switch
(D) A power source
Ans: C
21. Which of the following is an advantage to use fiber optic data transmission?
(A) Resistance to the data theft
(B) Fast data transmission rate
(C) Low noise level
(D) All of the above
Ans: D
22. A breakdown which is caused by cumulative multiplication of carriers through field induced impact ionization occurs in
(A) Avalanche diode
(B) Tunnel diode
(C) Varactor diode
(D) Gunn diode
Ans: A
23. Transfer function of a system is necessary for the calculation of
(A) The time constant
(B) The output for a given input
(C) The steady state gain
(D) The order of the system
Ans: B
24. If one or more pairs of simple roots are located on imaginary axis of the s-plane but there are no roots in the right half of s-plane, the response due to initial condition will
(A) Decrease to zero as time approaches infinity.
(B) Increase as time approaches infinity.
(C) Be undamped sinusoidal oscillations.
(D) Be damped unsinusoidal oscillation and the damping factor will depend upon the relative location of the roots on the imaginary axis.
Ans: C
25. 8255A Programmable Peripheral Interface IC has got the 24 I/O lines in the following way (General form):
(A) Port A with 8 input lines, Port B with 8 output lines, Port C (upper nibble) with 4 input lines and Port C (lower nibble) with 4 output lines.
(B) Port A with 8 input/out lines, Port B with 8 input lines and Port C with 8 output lines.
(C) Port A with 8 input lines, Port B with 8 output lines and Port C with 8 bits as either input or output lines.
(D) Port A with 8 lines as input/output lines, Port B with 8 lines as input/output lines, Port C (lower nibble) with 4 lines as input/output lines. Port C (upper nibble) with 4 lines as input/output lines.
Ans: D
26. The Refractive Index of core in optical fibre should be
(A) Smaller than R.I. of cladding
(B) greater than R.I. of cladding
(C) Equal to R.I. of cladding
(D) Equal to air
Ans: B
27. Consider the following conditional expression z = (x > y)? x: y; if x = 2 and y = 8, the value of z is
(A) 2
(B) 8
(C) 6
(D) 10
Ans: B
28. int Net = 0;
if x < 50
if (y > 5)
Net = x + y;
else
Net = x – y;
For this C program segment, x = 55 and y = 5, then the value Net is
(A) 0
(B) 60
(C) 50
(D) 55
Ans: A
29. In 8253 programmable interval timer, in which modes, the counting is neither enabled nor disabled?
(A) 0 and 4
(B) 1 and 5
(C) 1 and 4
(D) 3 and 5
Ans: B
30. In which mode of 8259A programmable interrupt controller, all the Interrupt Requests (IRs) are arranged from highest to lowest with IR0 as the highest and IR1 as the lowest?
(A) Fully Nested Mode
(B) Automatic Rotation Mode
(C) Specific Rotation Mode
(D) Simple Rotation Mode
Ans: A
31. Which of the following logic family is fastest of all?
(A) TTL
(B) RTL
(C) DCTL
(D) ECL
Ans: D
32. In an OPAMP, following characteristics are given:
1. PSRR (Power Supply Rejection Ratio) = 0
2. Thermal Drift is defined in terms of μ Amperes/°C.
3. Thermal drift is defined in terms of μV/°C.
4. Slew rate is defined in terms of V/μs.
Which one of the following is correct?
(A) 1 and 2 only
(B) 1 and 3 only
(C) 1, 3 and 4
(D) 1, 2 and 4
Ans: C
33. Consider the following statement:
(i) A flip-flop is used to store 1-bit of information.
(ii) Race-around condition occurs in J-K flip-flop when both the inputs are 1.
(iii) Master-slave configuration is used in flip-flop to store 2-bits of information.
(iv) A transparent latch consists of D type flip-flop.
Which of the following statements is/are true?
(A) (i) only
(B) (i), (iii) and (iv)
(C) (i), (ii) and (iv)
(D) (ii) and (iii) only
Ans: C
34. An AM demodulator can be implemented with
(i) A linear multiplier followed by a low pass filter.
(ii) A linear multiplier followed by a high-pass filter.
(iii) A diode followed by low pass filter.
(iv) A linear multiplier followed byband-stop filter.
The correct answer is:
(A) (i) only
(B) (iii) only
(C) (i) and (iii)
(D) (iv) only
Ans: C
35. In feedback control system, relative stability can be calculated using
(i) Routh-Hurwitz Array
(ii) Nyquist plot
(iii) Polar plot
(iv) Root Locus Techniques
Correct answer is
(A) All of the above
(B) (i) and (ii) only
(C) (ii) and (iv) only
(D) (ii), (iii) and (iv)
Ans: C
36. In comparison to LED, LASER has
1. High emission frequency.
2. No tuning arrangement.
3. Wide spectral bandwidth.
4. Provision for confinement.
Of these statements:
(A) 1, 2 & 4 are correct.
(B) 1, 2, & 3 are correct.
(C) 1 & 4 are correct.
(D) 2 & 3 are correct.
Ans: C
37. The turn-off time of an SCR can be reduced by
1. Quick withdrawal of the gate voltage.
2. Reducing life-time by doping with gold.
3. Applying a negative voltage pulse to the gate.
Of these statements:
(A) 1, 2 and 3 are correct.
(B) 1 and 2 are correct.
(C) 1 and 3 are correct.
(D) 2 and 3 are correct.
Ans: D
38. Consider the following statements regarding a semiconductor:
1. Acceptor level lies close to the valence band.
2. Donor level lies close to the valence band.
3. n-type semiconductor behaves as a conductor at zero Kelvin.
4. p-type semiconductor behaves as an insulator at zero Kelvin.
Of these statements:
(A) 2 and 3 are correct.
(B) 1 and 3 are correct.
(C) 1 and 4 are correct.
(D) 3 and 4 are correct
Ans: C
39. Transfer function for a control system is defined for where
(i) Linear system
(ii) Nonlinear system
(iii) Time invariant system
(iv) Time variant system
(A) (i) and (iii)
(B) (ii) and (iv)
(C) (i) and (iv)
(D) (ii) and (iii)
Ans: A
40. Tri state Buffers provide
(i) Reduction of current consumption in the circuit.
(ii) Isolation from input to output.
(iii) High impedance during OFF state.
(iv) Low impedance during ON state.
(A) (i) and (iv)
(B) (ii) and (iv)
(C) (i) and (ii)
(D) (i) and (iii)
Ans: D
41. Consider the following:
1. CE stage
2. CC stage
3. OP amp
4. CB stage
The correct sequence of the input impedance in increasing order is:
(A) 4, 1, 2, 3
(B) 1, 4, 2, 3
(C) 1, 2, 4, 3
(D) 4, 2, 1, 3
Ans: A
42. The various components in super heterodyne receiver is arranged as
(i) AM Detector
(ii) Mixer
(iii) RF Amplifier
(iv) AF Amplifier
The correct sequence is
(A) (iii), (ii), (i), (iv)
(B) (i), (ii), (iv), (iii)
(C) (iii), (ii), (iv), (i)
(D) (ii), (i), (iii), (iv)
Ans: A
43. The figure of merit of logic family is given by
(A) Gain bandwidth product
(B) (Propagation delay time) × (power dissipation)
(C) (Fan out) × (propagation delay time)
(D) (Noise margin) × (power dissipation)
Ans: B
44. Arrange in ascending order the following logic families based on power delay products
(i) ECL
(ii) TTL
(iii) CMOS
Codes:
(A) (ii), (iii), (i)
(B) (ii), (i), (iii)
(C) (i), (ii), (iii)
(D) (iii), (ii), (i)
Ans: A
45. Consider the following four common type of transistors:
1. Point Contact Transistor
2. Bipolar Junction Transistor
3. MOS Field Effect Transistor
4. Junction Field Effect Transistor
Correct arrangement of these transistors in the increasing order of input impedance is
(A) 1, 2, 4, 3
(B) 1, 2, 3, 4
(C) 2, 1, 3, 4
(D) 2, 1, 4, 3
Ans: D
46. If the various logic families are arranged in the ascending order of their fan-out capabilities, the sequence will be
(A) TTL, DTL, ECL, MOS
(B) DTL, TTL, MOS, ECL
(C) MOS, DTL, TTL, ECL
(D) ECL, TTL, DTL, MOS
Ans: C
47. Consider the following waves/rays:
1. UV Rays
2. X Rays
3. Visible light
4. UHF waves
The correct sequence of the descending order in terms of frequency is:
(A) 3, 1, 2, 4
(B) 4, 3, 1, 2
(C) 2, 1, 3, 4
(D) 2, 4, 1, 3
Ans: C
48. In the Assembly program, the following steps are to be followed. Find the sequence in which the program to be written for 8085 microprocessor.
(i) Initialization of variables.
(ii) Initialization of stack.
(iii) Enable or disable interrupts.
(iv) Program should be completed with last line as ‘END’ statement.
(A) (i), (iii), (ii) and (iv)
(B) (i), (ii), (iii) and (iv)
(C) (ii), (i), (iii) and (iv)
(D) (ii), (iii), (i) and (iv)
Ans: C
49. In a 8085 microprocessor, the resistor which holds address of the next instruction to be fetched is
(A) Accumulator
(B) Program counter
(C) Stack pointer
(D) Instructor Register
Ans: B
50. If a carrier modulated by a digital bit stream had one of the possible phases of 0, 90, 180 and 270 degrees then modulation is called
(A) BPSK
(B) FSK
(C) QPSK
(D) QAM
Ans: C
51. Consider the following statements with respect to ECL gates:
(i) ECL represents non-saturated logic
(ii) ECL circuits are easy to interconnect with circuits of other families.
(iii) ECL family employs differential amplifier circuitry.
(iv) ECL has the unique feature of providing two outputs which are complementary to each other.
Among the above, which statements are correct?
(A) (i), (ii) & (iii)
(B) (ii), (iii) & (iv)
(C) (ii), (iv) & (i)
(D) (i), (iii) & (iv)
Ans: D
52. Consider the following statements:
(i) LCD essentially acts as a capacitor.
(ii) LCD has slow decay time.
(iii) LCD’s appear invisible in darkness.
(iv) Twisted nematic LCD segment appears black when it is in ‘ON’ condition.
Which is valid one?
(A) Statements (i) and (ii)
(B) Statements (ii) and (iii)
(C) Statements (ii), (iii) and (iv)
(D) Statements (i), (ii), (iii) and (iv)
Ans: D
53. Arrange the following in terms of increasing frequency:
1. UHF
2. X-Band
3. Sky waves
4. X-rays
The correct sequence is
(A) 3, 1, 2, 4
(B) 1, 4, 3, 2
(C) 4, 3, 2, 1
(D) 2, 3, 1, 4
Ans: A
54. Arrange the following in decreasing order of length:
1. 1 mil
2. 1 nm
3. 1 picometer
4. 1 femtometer
The correct sequence is
(A) 4, 3, 2, 1
(B) 1, 2, 3, 4
(C) 2, 1, 3, 4
(D) 4, 3, 1, 2
Ans: B
55. There are following blocks :
1. Antenna and RF stage
2. Mixer with Local oscillator
3. Amplifier (class C)
4. IF amplifier
5. Detector
The correct sequence of receiver section is
(A) 1, 2, 3, 4, 5
(B) 5, 1, 2, 3, 4
(C) 1, 2, 4, 3, 5
(D) 1, 2, 4, 5, 3
Ans: D
56. In a telemetry system, the correct sequence of transmission system is given by:
1. Information
2. Sensor and signal conditioning
3. Quantisation
4. Encoding
5. Antenna
The correct sequence is
(A) 5, 1, 2, 3, 4
(B) 1, 2, 3, 4, 5
(C) 2, 3, 4, 5, 1
(D) 5, 4, 3, 2, 1
Ans: B
57. The Fourier Transform of a Gaussian time pulse is
(A) Uniform
(B) A pair of impulse
(C) Gaussian
(D) Rayleigh
Ans: C
58. How many flip-flops are required to build a digital counter to count from 0 to 1024?
(A) 11
(B) 6
(C) 10
(D) 24
Ans: A
59. For measuring VSWR,
1. Microwave source
2. Detector amplifier
3. Meter
4. Slotted section
5. Variable attenuator
The correct sequence is
(A) 1, 5, 4, 2, 3
(B) 3, 2, 1, 5, 4
(C) 4, 1, 2, 3, 5
(D) 1, 2, 3, 4, 5
Ans: A
60. Arrange the following in order of increasing frequency:
1. L band
2. S band
3. C band
4. K band
The correct sequence is
(A) 4, 1, 2, 3
(B) 4, 3, 2, 1
(C) 1, 3, 4, 2,
(D) 1, 2, 3, 4
Ans: D
61. The radiative and non-radiative lifetimes of the minority carriers in the active region of a double heterojunction LED are 60 ns and 100 ns respectively. The internal quantum efficiency is given by:
(A) 60%
(B) 62.5%
(C) 37.5%
(D) 82.5%
Ans: B
62. What is the octal equivalent of the binary number 11111001?
(A) 761
(B) 762
(C) 371
(D) 372
Ans: C
63. The gauge factor of a resistance wire strain gauge is a measure of
(A) Sensitivity of the gauge
(B) Resolution
(C) Dynamic range of displacement measurement capability
(D) Variable inductance
Ans: A
64. In an LVDT, the two secondary wind map are connected in differential to obtain
(A) Higher output voltage
(B) an output voltage which is phase sensitive, i.e., the o/p voltage has a phase which can lead up to a conclusion whether the displacement of the core took place from right to left or from left to right.
(C) In order to establish a null or the reference point for the replacement of the core.
(D) Both (B) and (C)
Ans: D
65. Microprocessor is also known as CPU. What is CPU?
(A) Control Processing Unit
(B) Central Processing Unit
(C) Central Progressing Unit
(D) Control Progressing Unit
Ans: B
66. For a SMF, following characteristic are given by
1. 0 ≤ v < 2.405
2. v >> 2.405
3. Core radius is less than 10 μm
4. Attenuation is of the order of 1 dB/km
Which of the following statement is true?
(A) 1 and 4 is correct.
(B) 2 and 3 is correct.
(C) 1 and 3 is correct.
(D) 3 and 4 is correct.
Ans: C
67. Consider the following:
1. Quantization
2. Sampling
3. Encoding
4. Low-pass filter
The correct sequence for converting a low pass analog signal to Digital signal is
(A) 4, 3, 1, 2
(B) 4, 1, 2, 3
(C) 4, 2, 1, 3
(D) 4, 3, 2, 1
Ans: C
68. Consider the following circuit configurations:
1. Common emitter
2. Common base
3. Emitter follower
4. Emitter follower using Darlington pair
The correct sequence in increasing order of the input resistances of these configurations is
(A) 2, 1, 4, 3
(B) 1, 2, 4, 3
(C) 2, 1, 3, 4
(D) 1, 2, 3, 4
Ans: C
69. 8085 microprocessor has a flag register. The following flags are there, keep them in the ascending order starting from LSB to MSB.
1. Parity flag
2. Zero flag
3. Carry flag
4. Sign flag
(A) 1, 2, 3 and 4
(B) 2, 4, 1 and 3
(C) 3, 2, 1 and 4
(D) 3, 1, 2 and 4
Ans: D
70. The following logic families have their propagation delay. Arrange them from lowest propagation delay to highest propagation delay.
1. TTL (Standard)
2. ECL
3. Low power CMOS
4. DTL
(A) 2, 1, 4 and 3
(B) 2, 4, 1 and 3
(C) 4, 2, 3 and 1
(D) 1, 2, 3 and 4
Ans: A
71. Latch is a
(A) T flip-flop
(B) Master-slave JK flip-flop
(C) D flip-flop
(D) JK flip-flop
Ans: C
72. Consider the following logic families:
1. MOS
2. TTL
3. RTL
4. ECL
The correct sequence of the logic families in the order of their increasing noise margin is
(A) 3, 4, 1, 2
(B) 3, 4, 2, 1
(C) 4, 3, 2, 1
(D) 4, 3, 1, 2
Ans: B
73. The Pentium III processor is a
(A) 16 bit processor
(B) 32 bit processor
(C) 64 bit processor
(D) 128 bit processor
Ans: C
74. Demodulation is a process
(A) Done at the transmitter
(B) Of filtering the carrier
(C) Of removing the sidebands
(D) Similar to modulation
Ans: B
75. The terms frequency pushing and pulling are related to
(A) Reflex Klystron
(B) Two cavity klystron
(C) Pulsed radar system
(D) Magnetron
Ans: D
76. What will be the output of the following statements?
int a = 5, b = 2, c = 10, i = a > b
Void main ( )
{print f(“hello”); main ( );}
(A) 1
(B) 2
(C) Infinite number of times
(D) 10
Ans: C
77. Which data communication method is used for sending data in both directions at the same time?
(A) Super duplex
(B) Simplex
(C) Half duplex
(D) Full duplex
Ans: D
78. The highest data rate in fiber optic communication occurs in
(A) Single-mode fiber
(B) Graded-index fiber
(C) Multimode fiber
(D) Co-axial cable
Ans: A
79. Consider the following devices:
1. RTL
2. High Speed TTL
3. ECL
4. CMOS
The correct sequence of their decrease in power dissipation is
(A) 3, 1, 2, 4
(B) 3, 1, 4 ,2
(C) 1, 3, 2, 4
(D) 3, 2, 4, 1
Ans: A
80. Arrange the following in terms of their increasing conductivity:
1. Copper
2. Steel
3. Leather
4. Rubber
The correct sequence is
(A) 4, 3, 2, 1
(B) 4, 3, 1, 2
(C) 3, 4, 2, 1
(D) 2, 1, 3, 4
Ans: A
81. Following are the EM waves:
1. Red colour light
2. Blue colour light
3. Microwaves
4. X-rays
The correct sequence of decreasing order of wavelength is
(A) 2, 4, 3, 1
(B) 1, 3, 2, 4
(C) 3, 1, 4, 2
(D) 3, 1, 2, 4
Ans: D
82. Following are the process steps to fabricate an IC:
1. Crystal growth
2. Epitaxial growth
3. Photo etching
4. Diffusion
5. Vacuum evaporation of Aluminium
The correct sequence of fabrication is
(A) 1, 5, 3, 4, 2
(B) 1, 2, 3, 4, 5
(C) 1, 3, 2, 4, 5
(D) 1, 2, 4, 3, 5
Ans: B
83. 8085 microprocessor does not have
(A) Zero flag
(B) Sign flag
(C) Parity flag
(D) Overflow flag
Ans: D
84. Which mode of 8253 acts as a square wave generator?
(A) Mode-1
(B) Mode-2
(C) Mode-4
(D) Mode-3
Ans: D
85. Which of the following program is not a utility?
(A) Debugger
(B) Spool
(C) Editor
(D) Inhibit
Ans: B
86. Modulation is a process of
(A) Reducing distortions
(B) Improving thermal stability
(C) Combining audio and radio frequency waves at the transmitter
(D) Generating constant frequency waves
Ans: B
87. Which type of modulation causes envelope distortion of a base band signal?
(A) Amplitude modulation
(B) Frequency modulation
(C) Phase modulation
(D) Angle modulation
Ans: C
88. When microwave signals flow through the curvature of the earth, it is called
(A) Duct position
(B) Faraday’s effect
(C) Raman scattering
(D) Ionospheric scattering
Ans: A
89. The Reflex Klystron can be used as
(A) Amplifier only
(B) Oscillator only
(C) Both amplifier and oscillator
(D) Neither amplifier nor oscillator
Ans: B
90. In an SCR, dual converter circuit
(A) α1 + α2 = 90°
(B) α1 + α2 = 180°
(C) α1 + α2 = 270°
(D) α1 + α2 = 135°
Ans: B
91. Negative feedback in amplifier results in
(i) Reduced voltage gain
(ii) Reduced sensitivity
(iii) Decreased bandwidth
(iv) Reduced distortion
Of these statements:
(A) (i) and (ii) are correct
(B) (i), (ii) and (iii) are correct
(C) (i), (ii) and (iv) are correct
(D) (i) and (iv) are correct
Ans: C
92. Consider the following statements :
1. Figure of merit and CMRR are the same parameters.
2. In an Op-Amp CMRR is very high approaching to infinity.
3. The input stage of an Op-Amp is usually a differential amplifier
(A) 1, 2, 3 are correct
(B) 2 and 3 are correct
(C) 1 and 2 are correct
(D) 1 and 3 are correct
Ans: B
93. Consider the following statements in connection with Electrodynamometer type instruments:
(i) They serve as transfer instrument.
(ii) They exhibit square law response.
(iii) They are free from hysteresis.
(iv) They have eddy current damping.
Which are valid?
(A) (i), (ii), (iv)
(B) (i), (ii), (iii)
(C) (ii), (iii), (iv)
(D) (i), (ii), (iii), (iv)
Ans: B
94. Arrange the following in order of increasing wavelength of output wave :
1. He-Ne laser
2. Nd:YAG laser
3. Laser diode operating in 3rdtransmission window
The correct order is
(A) 3, 2, 1
(B) 2, 3, 1
(C) 1, 3, 2
(D) 1, 2, 3
Ans: D
95. Arrange the following in terms of increasing Delay Power Product:
1. TTL 74 AS
2. TTL 74 LS
3. CMOS-74 C
4. ECL 100 K
The correct sequence is
(A) 4, 3, 1, 2
(B) 4, 1, 2, 3
(C) 3, 1, 2, 4
(D) 1, 2, 3, 4
Ans: B
96. An 8086 has how many number of flags?
(A) 5
(B) 7
(C) 9
(D) 11
Ans: C
97. Following are the modulation/ multiplexing techniques:
1. AM
2. FM
3. CDMA
4. WDM
The correct sequence of carrier frequency in decreasing order is
(A) 1, 2, 3, 4
(B) 4, 3, 1, 2
(C) 4, 3, 2, 1
(D) 3, 4, 2, 1
Ans: C
98. In UJT, the value of stand-off ratio is
(A) 0.2
(B) 0.4
(C) 0.7
(D) 0.98
Ans: C
99. Tunnel diode is basically a junction diode with
(A) High doping in P-region alone
(B) High doping in p and n regions, both
(C) High doping in n region alone
(D) Low doping in both P and n regions
Ans: B
100. An Op-Amp behaves like an ideal Op- Amp upto
(A) Hz
(B) 5 KHz
(C) 5 MHz
(D) 50 MHz
Ans: B
(i) ECL represents non-saturated logic
(ii) ECL circuits are easy to interconnect with circuits of other families.
(iii) ECL family employs differential amplifier circuitry.
(iv) ECL has the unique feature of providing two outputs which are complementary to each other.
Among the above, which statements are correct?
(A) (i), (ii) & (iii)
(B) (ii), (iii) & (iv)
(C) (ii), (iv) & (i)
(D) (i), (iii) & (iv)
Ans: D
52. Consider the following statements:
(i) LCD essentially acts as a capacitor.
(ii) LCD has slow decay time.
(iii) LCD’s appear invisible in darkness.
(iv) Twisted nematic LCD segment appears black when it is in ‘ON’ condition.
Which is valid one?
(A) Statements (i) and (ii)
(B) Statements (ii) and (iii)
(C) Statements (ii), (iii) and (iv)
(D) Statements (i), (ii), (iii) and (iv)
Ans: D
53. Arrange the following in terms of increasing frequency:
1. UHF
2. X-Band
3. Sky waves
4. X-rays
The correct sequence is
(A) 3, 1, 2, 4
(B) 1, 4, 3, 2
(C) 4, 3, 2, 1
(D) 2, 3, 1, 4
Ans: A
54. Arrange the following in decreasing order of length:
1. 1 mil
2. 1 nm
3. 1 picometer
4. 1 femtometer
The correct sequence is
(A) 4, 3, 2, 1
(B) 1, 2, 3, 4
(C) 2, 1, 3, 4
(D) 4, 3, 1, 2
Ans: B
55. There are following blocks :
1. Antenna and RF stage
2. Mixer with Local oscillator
3. Amplifier (class C)
4. IF amplifier
5. Detector
The correct sequence of receiver section is
(A) 1, 2, 3, 4, 5
(B) 5, 1, 2, 3, 4
(C) 1, 2, 4, 3, 5
(D) 1, 2, 4, 5, 3
Ans: D
56. In a telemetry system, the correct sequence of transmission system is given by:
1. Information
2. Sensor and signal conditioning
3. Quantisation
4. Encoding
5. Antenna
The correct sequence is
(A) 5, 1, 2, 3, 4
(B) 1, 2, 3, 4, 5
(C) 2, 3, 4, 5, 1
(D) 5, 4, 3, 2, 1
Ans: B
57. The Fourier Transform of a Gaussian time pulse is
(A) Uniform
(B) A pair of impulse
(C) Gaussian
(D) Rayleigh
Ans: C
58. How many flip-flops are required to build a digital counter to count from 0 to 1024?
(A) 11
(B) 6
(C) 10
(D) 24
Ans: A
59. For measuring VSWR,
1. Microwave source
2. Detector amplifier
3. Meter
4. Slotted section
5. Variable attenuator
The correct sequence is
(A) 1, 5, 4, 2, 3
(B) 3, 2, 1, 5, 4
(C) 4, 1, 2, 3, 5
(D) 1, 2, 3, 4, 5
Ans: A
60. Arrange the following in order of increasing frequency:
1. L band
2. S band
3. C band
4. K band
The correct sequence is
(A) 4, 1, 2, 3
(B) 4, 3, 2, 1
(C) 1, 3, 4, 2,
(D) 1, 2, 3, 4
Ans: D
61. The radiative and non-radiative lifetimes of the minority carriers in the active region of a double heterojunction LED are 60 ns and 100 ns respectively. The internal quantum efficiency is given by:
(A) 60%
(B) 62.5%
(C) 37.5%
(D) 82.5%
Ans: B
62. What is the octal equivalent of the binary number 11111001?
(A) 761
(B) 762
(C) 371
(D) 372
Ans: C
63. The gauge factor of a resistance wire strain gauge is a measure of
(A) Sensitivity of the gauge
(B) Resolution
(C) Dynamic range of displacement measurement capability
(D) Variable inductance
Ans: A
64. In an LVDT, the two secondary wind map are connected in differential to obtain
(A) Higher output voltage
(B) an output voltage which is phase sensitive, i.e., the o/p voltage has a phase which can lead up to a conclusion whether the displacement of the core took place from right to left or from left to right.
(C) In order to establish a null or the reference point for the replacement of the core.
(D) Both (B) and (C)
Ans: D
65. Microprocessor is also known as CPU. What is CPU?
(A) Control Processing Unit
(B) Central Processing Unit
(C) Central Progressing Unit
(D) Control Progressing Unit
Ans: B
66. For a SMF, following characteristic are given by
1. 0 ≤ v < 2.405
2. v >> 2.405
3. Core radius is less than 10 μm
4. Attenuation is of the order of 1 dB/km
Which of the following statement is true?
(A) 1 and 4 is correct.
(B) 2 and 3 is correct.
(C) 1 and 3 is correct.
(D) 3 and 4 is correct.
Ans: C
67. Consider the following:
1. Quantization
2. Sampling
3. Encoding
4. Low-pass filter
The correct sequence for converting a low pass analog signal to Digital signal is
(A) 4, 3, 1, 2
(B) 4, 1, 2, 3
(C) 4, 2, 1, 3
(D) 4, 3, 2, 1
Ans: C
68. Consider the following circuit configurations:
1. Common emitter
2. Common base
3. Emitter follower
4. Emitter follower using Darlington pair
The correct sequence in increasing order of the input resistances of these configurations is
(A) 2, 1, 4, 3
(B) 1, 2, 4, 3
(C) 2, 1, 3, 4
(D) 1, 2, 3, 4
Ans: C
69. 8085 microprocessor has a flag register. The following flags are there, keep them in the ascending order starting from LSB to MSB.
1. Parity flag
2. Zero flag
3. Carry flag
4. Sign flag
(A) 1, 2, 3 and 4
(B) 2, 4, 1 and 3
(C) 3, 2, 1 and 4
(D) 3, 1, 2 and 4
Ans: D
70. The following logic families have their propagation delay. Arrange them from lowest propagation delay to highest propagation delay.
1. TTL (Standard)
2. ECL
3. Low power CMOS
4. DTL
(A) 2, 1, 4 and 3
(B) 2, 4, 1 and 3
(C) 4, 2, 3 and 1
(D) 1, 2, 3 and 4
Ans: A
71. Latch is a
(A) T flip-flop
(B) Master-slave JK flip-flop
(C) D flip-flop
(D) JK flip-flop
Ans: C
72. Consider the following logic families:
1. MOS
2. TTL
3. RTL
4. ECL
The correct sequence of the logic families in the order of their increasing noise margin is
(A) 3, 4, 1, 2
(B) 3, 4, 2, 1
(C) 4, 3, 2, 1
(D) 4, 3, 1, 2
Ans: B
73. The Pentium III processor is a
(A) 16 bit processor
(B) 32 bit processor
(C) 64 bit processor
(D) 128 bit processor
Ans: C
74. Demodulation is a process
(A) Done at the transmitter
(B) Of filtering the carrier
(C) Of removing the sidebands
(D) Similar to modulation
Ans: B
75. The terms frequency pushing and pulling are related to
(A) Reflex Klystron
(B) Two cavity klystron
(C) Pulsed radar system
(D) Magnetron
Ans: D
76. What will be the output of the following statements?
int a = 5, b = 2, c = 10, i = a > b
Void main ( )
{print f(“hello”); main ( );}
(A) 1
(B) 2
(C) Infinite number of times
(D) 10
Ans: C
77. Which data communication method is used for sending data in both directions at the same time?
(A) Super duplex
(B) Simplex
(C) Half duplex
(D) Full duplex
Ans: D
78. The highest data rate in fiber optic communication occurs in
(A) Single-mode fiber
(B) Graded-index fiber
(C) Multimode fiber
(D) Co-axial cable
Ans: A
79. Consider the following devices:
1. RTL
2. High Speed TTL
3. ECL
4. CMOS
The correct sequence of their decrease in power dissipation is
(A) 3, 1, 2, 4
(B) 3, 1, 4 ,2
(C) 1, 3, 2, 4
(D) 3, 2, 4, 1
Ans: A
80. Arrange the following in terms of their increasing conductivity:
1. Copper
2. Steel
3. Leather
4. Rubber
The correct sequence is
(A) 4, 3, 2, 1
(B) 4, 3, 1, 2
(C) 3, 4, 2, 1
(D) 2, 1, 3, 4
Ans: A
81. Following are the EM waves:
1. Red colour light
2. Blue colour light
3. Microwaves
4. X-rays
The correct sequence of decreasing order of wavelength is
(A) 2, 4, 3, 1
(B) 1, 3, 2, 4
(C) 3, 1, 4, 2
(D) 3, 1, 2, 4
Ans: D
82. Following are the process steps to fabricate an IC:
1. Crystal growth
2. Epitaxial growth
3. Photo etching
4. Diffusion
5. Vacuum evaporation of Aluminium
The correct sequence of fabrication is
(A) 1, 5, 3, 4, 2
(B) 1, 2, 3, 4, 5
(C) 1, 3, 2, 4, 5
(D) 1, 2, 4, 3, 5
Ans: B
83. 8085 microprocessor does not have
(A) Zero flag
(B) Sign flag
(C) Parity flag
(D) Overflow flag
Ans: D
84. Which mode of 8253 acts as a square wave generator?
(A) Mode-1
(B) Mode-2
(C) Mode-4
(D) Mode-3
Ans: D
85. Which of the following program is not a utility?
(A) Debugger
(B) Spool
(C) Editor
(D) Inhibit
Ans: B
86. Modulation is a process of
(A) Reducing distortions
(B) Improving thermal stability
(C) Combining audio and radio frequency waves at the transmitter
(D) Generating constant frequency waves
Ans: B
87. Which type of modulation causes envelope distortion of a base band signal?
(A) Amplitude modulation
(B) Frequency modulation
(C) Phase modulation
(D) Angle modulation
Ans: C
88. When microwave signals flow through the curvature of the earth, it is called
(A) Duct position
(B) Faraday’s effect
(C) Raman scattering
(D) Ionospheric scattering
Ans: A
89. The Reflex Klystron can be used as
(A) Amplifier only
(B) Oscillator only
(C) Both amplifier and oscillator
(D) Neither amplifier nor oscillator
Ans: B
90. In an SCR, dual converter circuit
(A) α1 + α2 = 90°
(B) α1 + α2 = 180°
(C) α1 + α2 = 270°
(D) α1 + α2 = 135°
Ans: B
91. Negative feedback in amplifier results in
(i) Reduced voltage gain
(ii) Reduced sensitivity
(iii) Decreased bandwidth
(iv) Reduced distortion
Of these statements:
(A) (i) and (ii) are correct
(B) (i), (ii) and (iii) are correct
(C) (i), (ii) and (iv) are correct
(D) (i) and (iv) are correct
Ans: C
92. Consider the following statements :
1. Figure of merit and CMRR are the same parameters.
2. In an Op-Amp CMRR is very high approaching to infinity.
3. The input stage of an Op-Amp is usually a differential amplifier
(A) 1, 2, 3 are correct
(B) 2 and 3 are correct
(C) 1 and 2 are correct
(D) 1 and 3 are correct
Ans: B
93. Consider the following statements in connection with Electrodynamometer type instruments:
(i) They serve as transfer instrument.
(ii) They exhibit square law response.
(iii) They are free from hysteresis.
(iv) They have eddy current damping.
Which are valid?
(A) (i), (ii), (iv)
(B) (i), (ii), (iii)
(C) (ii), (iii), (iv)
(D) (i), (ii), (iii), (iv)
Ans: B
94. Arrange the following in order of increasing wavelength of output wave :
1. He-Ne laser
2. Nd:YAG laser
3. Laser diode operating in 3rdtransmission window
The correct order is
(A) 3, 2, 1
(B) 2, 3, 1
(C) 1, 3, 2
(D) 1, 2, 3
Ans: D
95. Arrange the following in terms of increasing Delay Power Product:
1. TTL 74 AS
2. TTL 74 LS
3. CMOS-74 C
4. ECL 100 K
The correct sequence is
(A) 4, 3, 1, 2
(B) 4, 1, 2, 3
(C) 3, 1, 2, 4
(D) 1, 2, 3, 4
Ans: B
96. An 8086 has how many number of flags?
(A) 5
(B) 7
(C) 9
(D) 11
Ans: C
97. Following are the modulation/ multiplexing techniques:
1. AM
2. FM
3. CDMA
4. WDM
The correct sequence of carrier frequency in decreasing order is
(A) 1, 2, 3, 4
(B) 4, 3, 1, 2
(C) 4, 3, 2, 1
(D) 3, 4, 2, 1
Ans: C
98. In UJT, the value of stand-off ratio is
(A) 0.2
(B) 0.4
(C) 0.7
(D) 0.98
Ans: C
99. Tunnel diode is basically a junction diode with
(A) High doping in P-region alone
(B) High doping in p and n regions, both
(C) High doping in n region alone
(D) Low doping in both P and n regions
Ans: B
100. An Op-Amp behaves like an ideal Op- Amp upto
(A) Hz
(B) 5 KHz
(C) 5 MHz
(D) 50 MHz
Ans: B
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