> > Electronic Design MCQs > Basic Electronic Design MCQs

Basic Electronic Design MCQ

1. Electro___________ is a procedure that destroys tissue by burning with an electric spark.

Desiccation

Leukoplakia

Dermabrasion

Impetigo

Answer

Correct Answer: Desiccation

Note: This Question is unanswered, help us to find answer for this one

2. For a three phase full wave rectifier, no load D.C output is _____.

2 Vm/p

Vm/p

Vm/2p

3Vm/p

Answer

Correct Answer: 3Vm/p

Note: This Question is unanswered, help us to find answer for this one

3. In a half wave rectifier, the maximum firing angle is restricted to _____.

45°

60°

90°

180°

Answer

Correct Answer: 90°

Note: This Question is unanswered, help us to find answer for this one

4. If the RF signal is 600 KHz and the local oscillator frequency is 1000KHz, the output of the mixer will be _____.

400 KHz

600 KHz

1000 KHz

1600 KHz

Answer

Correct Answer: 400 KHz

Note: This Question is unanswered, help us to find answer for this one

5. For a class-A power amplifier, the position of point Q is _____.

in the cut-off region

just above the cut-off

at the center of load line

below the cut-off

Answer

Correct Answer: at the center of load line

Note: This Question is unanswered, help us to find answer for this one

6. An operational amplifier can amplify ____________.

D.C signals only

A.C signals only

square waves

None of the above

Answer

Correct Answer: square waves

Note: This Question is unanswered, help us to find answer for this one

7. Negative Feedback in amplifiers increases _____.

bandwidth

input resistance

output resistance

both a and b

Answer

Correct Answer: both a and b

Note: This Question is unanswered, help us to find answer for this one

8. An oscillator is a _____.

rotating device

static electronic device

rotating electronic device

electro-mechanical device

Answer

Correct Answer: static electronic device

Note: This Question is unanswered, help us to find answer for this one

9. In a Wien-bridge oscillator with R=5KΩ and C=0.01µF, the frequency of oscillation will be _____.

7.8 KHz

3.2 KHz

2.5 KHz

780 Hz

Answer

Correct Answer: 3.2 KHz

Note: This Question is unanswered, help us to find answer for this one

10. What would be the increase in the power delivered to the load if the total harmonic distortion is 10%?

Answer

Correct Answer: 1%

Note: This Question is unanswered, help us to find answer for this one

11. The gain of an inverting operational amplifier is given as _____________.

-R2/R1

R1/R2

-R1/R2

R1/(R1+R2)

Answer

Correct Answer: -R2/R1

Note: This Question is unanswered, help us to find answer for this one

12. The latching current of an SCR is _____.

below 10%

10-20%

20-25%

25-30%

Answer

Correct Answer: below 10%

Note: This Question is unanswered, help us to find answer for this one

13. If a diode is connected in anti-parallel with a thyristor, _____.

both the turn-off power loss and the turn-off time decrease

the turn-off power loss decreases but the turn-off time increases

the turn-off power loss increases but the turn-off time decreases

None of the above

Answer

Correct Answer: the turn-off power loss decreases but the turn-off time increases

Note: This Question is unanswered, help us to find answer for this one

14. For generating a 1 KHz signal, the most suitable circuit is the _____.

Hartley oscillator

Colpitt’s oscillator

untuned collector oscillator

Wien-bridge oscillator

Answer

Correct Answer: Wien-bridge oscillator

Note: This Question is unanswered, help us to find answer for this one

15. An R-C phase shift oscillator will not produce any oscillations until and unless the voltage gain of its internal amplifier is _____.

more than 3 but less than 10

less than 20

more than 29

None of the above

Answer

Correct Answer: more than 29

Note: This Question is unanswered, help us to find answer for this one

16. For insulators, the forbidden gap is of the order of _____.

5eV

1eV

0.1CeV

zero

Answer

Correct Answer: 5eV

Note: This Question is unanswered, help us to find answer for this one

17. Suppose the anode current of a conducting SCR is 50A. If its gate current is reduced to one-fifth, its anode current will become _____.

10A

50A

25A

zero

Answer

Correct Answer: 50A

Note: This Question is unanswered, help us to find answer for this one

18. An Oscillator has _____.

A.C input

D.C input

Both A.C and D.C inputs

None of the above

Answer

Correct Answer: D.C input

Note: This Question is unanswered, help us to find answer for this one

19. In a complementary – symmetry amplifier, both transistors are used in the ____ configuration/s

All of the above

Answer

Correct Answer: CC

Note: This Question is unanswered, help us to find answer for this one

20. The alpha of a transistor is _____.

.99

.01

Answer

Correct Answer: .99

Note: This Question is unanswered, help us to find answer for this one

21. The voltage gain of an amplifier without feedback is 60dB. It decreases to 40dB with feedback. What will be the feedback factor?

8*10-3

9*10-3

10*10-3

7*10-3

Answer

Correct Answer: 9*10-3

Note: This Question is unanswered, help us to find answer for this one

22. Which of the following devices uses negative feedback?

Oscillaters

Schmitt trigger

Amplifiers

All of the above

Answer

Correct Answer: Amplifiers

Note: This Question is unanswered, help us to find answer for this one

23. Which one of the following is a general purpose operational amplifier?

IC-714

IC-147

IC-777

IC-741

Answer

Correct Answer: IC-741

Note: This Question is unanswered, help us to find answer for this one

24. In an amplifier , the coupling capacitors are employed for _____.

limiting the bandwidth

matching the impedances

controlling the output

preventing the D.C from mixing with the input or output

Answer

Correct Answer: preventing the D.C from mixing with the input or output

Note: This Question is unanswered, help us to find answer for this one

25. The most important characteristic of a crystal oscillator is _____.

that it has high efficiency

that it requires very low D.C. supply

that its output frequency is substantially constant

that it has a low cost

Answer

Correct Answer: that its output frequency is substantially constant

Note: This Question is unanswered, help us to find answer for this one

26. The oscillator circuit that uses a tapped coil in a tuned circuit is _____.

multi-vibrator

Hartley

Armstrong

Colpitt’s

Answer

Correct Answer: Hartley

Note: This Question is unanswered, help us to find answer for this one

27.
Refer to the given image:
The voltage at V1 and V2 of the arrangement shown in the image, will be _________ respectively.

6V and 5.4V

5.4V and 6V

3V and 5.4V

6V and 3V

Answer

Correct Answer:

6V and 5.4V

Note: This Question is unanswered, help us to find answer for this one

28. Ultraviolet radiation is used in the IC fabrication process for _____.

diffusion

masking

isolation

metallization

Answer

Correct Answer: diffusion

Note: This Question is unanswered, help us to find answer for this one

29. The transformer is used for impedance matching . It is expected to match 1296Ω resistance on the primary side to a 16Ω resistance on the secondary side. Calculate the required turn ratio of a transformer, what is the type of transformer?

Step-up

Step-down

Cannot be determined

Answer

Correct Answer: Step-down

Note: This Question is unanswered, help us to find answer for this one

30. For a full wave controlled rectifier using SCR, the average load voltage is________. (VLdc )

Vm [1 + cosa]/2p

Vm [1 + cosa]/p

Vm [1 + sina]/p

Vm [1 + sina]/2p

Answer

Correct Answer: Vm [1 + cosa]/p

Note: This Question is unanswered, help us to find answer for this one

31. The output impedance of an operational amplifier is _____.

very low

very high

dependant on the signal applied

None of the above

Answer

Correct Answer: very low

Note: This Question is unanswered, help us to find answer for this one

32. The application where one is most likely to find a quartz oscillator would be _____.

a radio transmitter

a radio receiver

a digital clock

an audio signal generator

Answer

Correct Answer: a radio transmitter

Note: This Question is unanswered, help us to find answer for this one

33. What would be the input impedance of an ideal op-amp?

Finite

Zero

Infinite

Unity

Answer

Correct Answer: Infinite

Note: This Question is unanswered, help us to find answer for this one

34.
Refer to the given image:
The circuit shown in the image has a zener regulated D.C power supply. Assuming that the zener diode is ideal, the minimum value of RL due to which the output voltage would remain constant will be ________.

15ohm

24ohm

27ohm

45ohm

Answer

Correct Answer:

45ohm

Note: This Question is unanswered, help us to find answer for this one

35. Which one of the following amplifiers is designed to operate digital signals?

Class-A

Class-B

Class-C

Class-D

Answer

Correct Answer: Class-D

Note: This Question is unanswered, help us to find answer for this one

36. In the transistor circuit shown in the figure, the collector-to-ground voltage is 20V. Which of the following is the probable cause of the error?

The collector-emitter terminals short-circuited

The emitter to ground connection open

The 10KΩ resistor open

The collector- base terminal short-circuited

Answer

Correct Answer: The emitter to ground connection open

Note: This Question is unanswered, help us to find answer for this one

37. An ideal amplifier has the _____.

noise figure of 0dB

noise figure of more than 0dB

noise factor of unity

noise figure of less than 1dB

Answer

Correct Answer: noise factor of unity

Note: This Question is unanswered, help us to find answer for this one

38.
D.C current of a half wave rectifier is _____.
Here, Im = peak value of the input current.

Answer

Correct Answer:

Note: This Question is unanswered, help us to find answer for this one

39. The Hall Effect voltage in intrinsic silicon _____.

is positive

is zero

is negative

changes the sign on the application of the magnetic field

Answer

Correct Answer: is negative

Note: This Question is unanswered, help us to find answer for this one

40. The loop gain of the oscillator to start with is _____.

slightly more than one

more than 100

less than one

None of the above

Answer

Correct Answer: slightly more than one

Note: This Question is unanswered, help us to find answer for this one

41. The transistor equivalent of the thyratron tube is _____.

SCR

UJT

Diac

Triac

Answer

Correct Answer: SCR

Note: This Question is unanswered, help us to find answer for this one

42. In a negative feedback circuit , the feedback factor is always between _____.

0 and 1

1 and 2

2 and 3

3 and 4

Answer

Correct Answer: 0 and 1

Note: This Question is unanswered, help us to find answer for this one

43. How much power is dissipated in the individual transistor of a Class-B push-pull amplifier if Vcc=20V and R1=4Ω (primary resistance)

12W

10.13W

20.26W

Answer

Correct Answer: 10.13W

Note: This Question is unanswered, help us to find answer for this one

44. Which one of the following amplifiers has the highest efficiency?

Class-A

Class-B

Class-C

Class-AB

Answer

Correct Answer: Class-C

Note: This Question is unanswered, help us to find answer for this one

45. Both positive and negative feedbacks are employed in _____.

a Hartley Oscillator

a Colpitt’s Oscillator

a Tuned – Collector Oscillator

a Wien Bridge Oscillator

Answer

Correct Answer: a Tuned – Collector Oscillator

Note: This Question is unanswered, help us to find answer for this one

46. An emitter follower is found to have a voltage gain of 0.99. What would be the value of ß for its transistors?

100

Answer

Correct Answer: 99

Note: This Question is unanswered, help us to find answer for this one

47. Which semiconductor power device out of the following is not a current triggered device?

Thyristor

GTO

Triac

MOSFET

Answer

Correct Answer: MOSFET

Note: This Question is unanswered, help us to find answer for this one

48. Which of the following does not cause permanent damage to an SCR?

High current

High rate of the rise of the current

High temperature rise

High rate of the rise of the voltage

Answer

Correct Answer: High current

Note: This Question is unanswered, help us to find answer for this one

49. In a class-B power amplifier, the output signal is obtained only _____.

for one half cycle period of the input A.C signal

for full cycle period of the input A.C signal

for quarter cycle period of the input A.C signal

Answer

Correct Answer: for one half cycle period of the input A.C signal

Note: This Question is unanswered, help us to find answer for this one

50. The dV/dt capability of the thyristor is _____ that of the triac.

lower than

higher than

equal to

None of the above

Answer

Correct Answer: lower than

Note: This Question is unanswered, help us to find answer for this one

51. What would be the output of a voltage follower if it has an input of 0.3Vpp?

0.6 Vpp

0.3 Vpp

v3 Vpp

v2 Vpp

Answer

Correct Answer: 0.3 Vpp

Note: This Question is unanswered, help us to find answer for this one

52. For class-AB power amplifier, the output current flows _____.

for more than 90° but less than 180°

for more than 270° but less than 360°

for more than 180° but less than 360°

for more than 45° but less than 90°

Answer

Correct Answer: for more than 180° but less than 360°

Note: This Question is unanswered, help us to find answer for this one

53. Most SCRs can be turned-off by voltage reversal during the negative half-cycle of the A.C supply for _____.

all frequencies

frequencies up to 300Hz

frequencies up to 30KHz

frequencies up to 300KHz

Answer

Correct Answer: frequencies up to 300Hz

Note: This Question is unanswered, help us to find answer for this one

54. A differentiator converts a linear ramp into a _____.

triangular wave

square wave

sinusoidal wave

constant D.C signal

Answer

Correct Answer: constant D.C signal

Note: This Question is unanswered, help us to find answer for this one

55. An amplifier has a bandwidth of 200KHz and a voltage gain of 100. What will be the new bandwidth if 5% negative feedback is introduced?

1000KHz

1200KHz

1600KHz

2000KHz

Answer

Correct Answer: 1200KHz

Note: This Question is unanswered, help us to find answer for this one

56. An Emitter follower is used for _____.

high current gain

high voltage gain

impedance matching

high power gain

Answer

Correct Answer: impedance matching

Note: This Question is unanswered, help us to find answer for this one

57. A transistor is a semiconductor switch which is _____.

unilateral and astable

bilateral and astable

unilateral and bistable

bilateral and bistable

Answer

Correct Answer: unilateral and astable

Note: This Question is unanswered, help us to find answer for this one

58. A crystal oscillator provides very stable frequency because of _____.

the high stability of the crystal

the rigid crystal structure

the low XL/R ratio of the crystal

the high Q of the crystal

Answer

Correct Answer: the high Q of the crystal

Note: This Question is unanswered, help us to find answer for this one

59. For designing a Push-Pull amplifier, the type of transistors should be _____.

one should be p-n-p and the other should be n-p-n

Both should be either p-n-p or n-p-n

both should be n-p-n only

All of the above

Answer

Correct Answer: Both should be either p-n-p or n-p-n

Note: This Question is unanswered, help us to find answer for this one

60. An amplifier has a gain of 10 without feedback. To make it oscillate, ß must be _____.

0.2

0.1

0.5

0.8

Answer

Correct Answer: 0.1

Note: This Question is unanswered, help us to find answer for this one

61. A feedback amplifier has an internal gain = 40dB and a feedback factor = 0.05, if the input impedance of this circuit is 12KΩ. What would have been the input impedance of the amplifier if the feedback had not been present?

1KΩ

2KΩ

3KΩ

4KΩ

Answer

Correct Answer: 2KΩ

Note: This Question is unanswered, help us to find answer for this one

62. After triggering an SCR , the gate pulse is removed. the current in the SCR will _____.

remain the same

immediately fall to zero

rise-up

rise a little and fall to zero

Answer

Correct Answer: remain the same

Note: This Question is unanswered, help us to find answer for this one

63. A half wave rectifier supplies power to 1000Ω load from a 110V (r.m.s) source of supply. If the forward resistance of the diode is 20Ω. What would be the efficiency of the rectifier?

50%

25.73%

39.73%

30.11%

Answer

Correct Answer: 39.73%

Note: This Question is unanswered, help us to find answer for this one

64. A bridge rectifier circuit has secondary voltage of 12Vr.m.s. Assume secondary resistance and diode forward resistance to be negligible. The load resistance is 100Ω. What would be the peak load current?

0.169 Amp

0.108 Amp

0.118 Amp

11.8 Amp

Answer

Correct Answer: 0.169 Amp

Note: This Question is unanswered, help us to find answer for this one

65. A voltage V=300cos100t is applied to a half wave rectifier with RL =5KΩ. The rectifier may be represented by an ideal diode in series with a resistance of 1KΩ. What would be the ripple factor in this case?

100%

110.21%

121.13%

Answer

Correct Answer: 121.13%

Note: This Question is unanswered, help us to find answer for this one

66. A Wien-bridge oscillator is basically a _____.

pulse generator

sine-wave generator

square-wave generator

triangular wave generator

Answer

Correct Answer: sine-wave generator

Note: This Question is unanswered, help us to find answer for this one

67. A Colpitt’s oscillator uses _____.

a tapped inductor

a tapped capacitor

no tapped inductor or capacitor

both a tapped inductor and a tapped capacitor

Answer

Correct Answer: a tapped capacitor

Note: This Question is unanswered, help us to find answer for this one

Electronic Design MCQs | Topic-wise

MCQ on Electronic communication

General Electronic Design MCQs

Electronic Design Subjects

Electronic communication MCQs

More Resources

Electronic Design MCQ

Electronic Design Skill Assessment

Electronic Design PDF

Related MCQs

Electronics MCQs

Fiber Optics MCQs

PCB Design MCQs

USB Electronics MCQs

VLSI - Very Large Scale Integration MCQs

Basic Electronic Design MCQ

1. Electro___________ is a procedure that destroys tissue by burning with an electric spark.

2. For a three phase full wave rectifier, no load D.C output is _____.

3. In a half wave rectifier, the maximum firing angle is restricted to _____.

4. If the RF signal is 600 KHz and the local oscillator frequency is 1000KHz, the output of the mixer will be _____.

5. For a class-A power amplifier, the position of point Q is _____.

6. An operational amplifier can amplify ____________.

7. Negative Feedback in amplifiers increases _____.

8. An oscillator is a _____.

9. In a Wien-bridge oscillator with R=5KΩ and C=0.01µF, the frequency of oscillation will be _____.

10. What would be the increase in the power delivered to the load if the total harmonic distortion is 10%?

11. The gain of an inverting operational amplifier is given as _____________.

12. The latching current of an SCR is _____.

13. If a diode is connected in anti-parallel with a thyristor, _____.

14. For generating a 1 KHz signal, the most suitable circuit is the _____.

15. An R-C phase shift oscillator will not produce any oscillations until and unless the voltage gain of its internal amplifier is _____.

16. For insulators, the forbidden gap is of the order of _____.

17. Suppose the anode current of a conducting SCR is 50A. If its gate current is reduced to one-fifth, its anode current will become _____.

18. An Oscillator has _____.

19. In a complementary – symmetry amplifier, both transistors are used in the ____ configuration/s

20. The alpha of a transistor is _____.

21. The voltage gain of an amplifier without feedback is 60dB. It decreases to 40dB with feedback. What will be the feedback factor?

22. Which of the following devices uses negative feedback?

23. Which one of the following is a general purpose operational amplifier?

24. In an amplifier , the coupling capacitors are employed for _____.

25. The most important characteristic of a crystal oscillator is _____.

26. The oscillator circuit that uses a tapped coil in a tuned circuit is _____.

27. Refer to the given image:The voltage at V1 and V2 of the arrangement shown in the image, will be _________ respectively.

28. Ultraviolet radiation is used in the IC fabrication process for _____.

29. The transformer is used for impedance matching . It is expected to match 1296Ω resistance on the primary side to a 16Ω resistance on the secondary side. Calculate the required turn ratio of a transformer, what is the type of transformer?

30. For a full wave controlled rectifier using SCR, the average load voltage is________. (VLdc )

31. The output impedance of an operational amplifier is _____.

32. The application where one is most likely to find a quartz oscillator would be _____.

33. What would be the input impedance of an ideal op-amp?

34. Refer to the given image:The circuit shown in the image has a zener regulated D.C power supply. Assuming that the zener diode is ideal, the minimum value of RL due to which the output voltage would remain constant will be ________.

35. Which one of the following amplifiers is designed to operate digital signals?

36. In the transistor circuit shown in the figure, the collector-to-ground voltage is 20V. Which of the following is the probable cause of the error?

37. An ideal amplifier has the _____.

38. D.C current of a half wave rectifier is _____.Here, Im = peak value of the input current.

39. The Hall Effect voltage in intrinsic silicon _____.

40. The loop gain of the oscillator to start with is _____.

41. The transistor equivalent of the thyratron tube is _____.

42. In a negative feedback circuit , the feedback factor is always between _____.

43. How much power is dissipated in the individual transistor of a Class-B push-pull amplifier if Vcc=20V and R1=4Ω (primary resistance)

44. Which one of the following amplifiers has the highest efficiency?

45. Both positive and negative feedbacks are employed in _____.

46. An emitter follower is found to have a voltage gain of 0.99. What would be the value of ß for its transistors?

47. Which semiconductor power device out of the following is not a current triggered device?

48. Which of the following does not cause permanent damage to an SCR?

49. In a class-B power amplifier, the output signal is obtained only _____.

50. The dV/dt capability of the thyristor is _____ that of the triac.

51. What would be the output of a voltage follower if it has an input of 0.3Vpp?

52. For class-AB power amplifier, the output current flows _____.

53. Most SCRs can be turned-off by voltage reversal during the negative half-cycle of the A.C supply for _____.

54. A differentiator converts a linear ramp into a _____.

55. An amplifier has a bandwidth of 200KHz and a voltage gain of 100. What will be the new bandwidth if 5% negative feedback is introduced?

56. An Emitter follower is used for _____.

57. A transistor is a semiconductor switch which is _____.

58. A crystal oscillator provides very stable frequency because of _____.

59. For designing a Push-Pull amplifier, the type of transistors should be _____.

60. An amplifier has a gain of 10 without feedback. To make it oscillate, ß must be _____.

61. A feedback amplifier has an internal gain = 40dB and a feedback factor = 0.05, if the input impedance of this circuit is 12KΩ. What would have been the input impedance of the amplifier if the feedback had not been present?

62. After triggering an SCR , the gate pulse is removed. the current in the SCR will _____.

63. A half wave rectifier supplies power to 1000Ω load from a 110V (r.m.s) source of supply. If the forward resistance of the diode is 20Ω. What would be the efficiency of the rectifier?

64. A bridge rectifier circuit has secondary voltage of 12Vr.m.s. Assume secondary resistance and diode forward resistance to be negligible. The load resistance is 100Ω. What would be the peak load current?

65. A voltage V=300cos100t is applied to a half wave rectifier with RL =5KΩ. The rectifier may be represented by an ideal diode in series with a resistance of 1KΩ. What would be the ripple factor in this case?

66. A Wien-bridge oscillator is basically a _____.

67. A Colpitt’s oscillator uses _____.

27.
Refer to the given image:
The voltage at V1 and V2 of the arrangement shown in the image, will be _________ respectively.

34.
Refer to the given image:
The circuit shown in the image has a zener regulated D.C power supply. Assuming that the zener diode is ideal, the minimum value of RL due to which the output voltage would remain constant will be ________.

38.
D.C current of a half wave rectifier is _____.
Here, Im = peak value of the input current.