General Electronic Design MCQs

1. A Colpitt’s oscillator uses _____.

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

3. 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?

4. 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?

5. 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?

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

7. 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?

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

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

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

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

12. An Emitter follower is used for _____.

13. 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?

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

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

16. One of the ways to destroy a diode is _____.

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

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

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

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

21. Which does not cause permanent damage to an SCR?

22. Which semiconductor power device is not a current triggered device?

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

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

25. Which amplifiers has the highest efficiency?

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

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

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

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

30. The Hall Effect voltage in intrinsic silicon _____.

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

32. An ideal amplifier has the _____.

33. 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?

34. Which amplifiers is designed to operate digital signals?

35. 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 ________.

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

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

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

39. To generate 1KHz frequency of oscillations, the most suitable circuit is _____.

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

41. 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?

42. Ultraviolet radiation is used in the IC fabriAcation process for _____.

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

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

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

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

47. Which is a general purpose operational amplifier?

48. Which devices uses negative feedback?

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

50. The alpha of a transistor is _____.

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

52. An Oscillator has _____.

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

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

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

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

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

58. The latching current of an SCR is _____.

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

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

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

62. An oscillator is a _____.

63. Negative Feedback in amplifiers increases _____.

64. An operational amplifier can amplify ____________.

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

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

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

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

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