Electronics Engineering Review Materials: Section 2 Module 4

This is the Section 2 Module 4 of the compiled Electronics Review Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and the Internet.

Electronics Review Materials: Section 2 Module 4

This is the Section 2 Module 4 of the compiled Electronics Review Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and the Internet. This particular reviewer in Electronics Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.

Electronics Engineering Reviewers: Section 2 Module 4

Question

Answer

1. In a non-inverting amplifier, the advantage of JFET in terms of control is that it is _____ rather than ______

DC, AC

2. Advantage of FET over BJT

It has greater range of voltage

3. BiMos is

Bipolar MOSFET

4. BiFET opamp has____ input impedance

High

5. How many materials are there in a transistor

3

6. Which of the following has 4 terminals

SCS

7. What component is used as reference voltages

Zener diode

8. What is the typical Q of a crystal

20,000

9. The resonant frequency of a crystal depends on the

Size and thickness of the material

10. In a motor, regardless of AC or DC, what is its source

Prime mover

11. Sallen-Key is also called

VCVS

12. Maximum forward voltage of a Zener diode

600mV

13. What class of amplifier is used in radio and communications

Class C

14. Maximum efficiency of transformer coupled Class A amplifier

50%

15. A Repulsion motor has a/an

Commutator

16. What configuration has the lowest input impedance

Common-Base

17. What provides a relatively flat passband

Inverse Chebyshev

18. MOSFET has how many terminals

3 or 4

19. Which of the following has no cathode?

TRIAC

20. The advantage of a universal motor is that it can work both in____

AC and DC

21. What is the reason why a universal motor is widely used?

Because it has high kW/kg ratio

22. A commutator conveys

Induced AC to DC

23. Laminating of core eliminates/reduces

Eddy current

24. LASCR maximum current is

3A

25. Fastest turn off time

LASCR

26. Monostable 555 IC has ___stable state

1

27. LM7812 IC outputs how many volts

12V

28. 1n4001 internal resistance

0.23 ohms

29. Buck switch increases

Duty cycle

30. When Q is near the center of loadline, clipping will occur in the

Negative cycle of the output

31. In a wave winding, the number of times it has to turn before returning to its starting point.

2 times/twice

32. In an ideal ammeter, half scale deflection happens at

50% power

33. To invert the direction of a motor, the _____winding is also inverted

Starting

34. When the load resistance is short circuited, the voltage drop would be

0V

35. As the maximum voltage goes to 0, the current goes to

Infinity

36. Unipolar devices have how many injected carriers going into the region

1

37. Which of the following components has a negative resistance region

UJT

38. In ICVS, if there is no output, then

The feedback resistance is shorted

39. If the motor speed is slower, then it means that it has

Worn bearings

40. In an emitter bias, the voltage at the emitter resistor is the voltage between the emitter and the ___________

Ground

41. A 339IC has how many comparator

4

42. If the motor is disconnected from the source, what keeps it running?

Running winding

43. PUT has how many terminals

3

44. What instrument is used to view the harmonics of a signal?

Spectrum analyzer

45. The graph of emitter-collector voltage versus base-emitter voltage applies to

Emitter diode

46. When there is a small collector current and the base current is zero, the leakage from the collector comes from the

Collector diode

47. Which class of amplifiers has the least efficiency

Class A

48. Isolates the input from the output

Optocoupler

49. The Q of a Sallen-Key filter at the second stage depends on the

Voltage gain

50. In the Arsonval movement meter, you can convert it into an audio frequency AC ammeter by adding a

Rectifier

51. Which of the following operates only in its reverse biased condition

Phototransistor

52. An op-amp zero crossing detector without hysteresis has

No feedback

53. It determines the cut-off frequency of an inverting amplifier

Compensating capacitor

54. Which of the following has the lowest resistance

Series Field

55. In BJT amplifiers, the _______ gain ranges from less than 1 up to 100

Current

56. The starting winding in a single phase motor is seen in the

Stator

57. The armature coils are not in axial but skewed. The reason why it is still used even if it is hard to wind the coil is because

To quiet its operation

58. Howland Current produces

A unidirectional single-ended load current

59. What is the operating frequency of a capacitor in parallel in an ideal diode

Very High frequency

60. When the EMOSFET is operated in the cut-off and ohmic region, it acts as a

Switching device

61. The open loop gain of a non-inverting amplifier is equal to the

Feedback resistance divided by its input resistance

62. What happens to the starting capacitor if the centrifugal switch is not triggered to open

Capacitor failure

63. In a permanent single phase capacitor motor, it has no

Centrifugal switch

64. When the graph of the drain current is steep, the output impedance is

High

65. Donor atoms has ____valence electrons

5

66. A 339IC acts as a

Comparator

67. When an armature coil sides are pole-pitch apart

Full-pitch

68. Single phase motor, _____

Cannot self excite

69. In compound generators, which has the lowest input impedance

Starting winding

70. The gate voltage in dc analysis is

0V

71. In n-channel JFETs, when the gate voltage becomes very negative, the current path

Shrinks

72. To improve the high frequency response of an op-amp, which of the following would you employ,

Shortening of the leads

73. Which are used in manufacturing Tunnel Diodes

Gallium and germanium

74. In BJTs, the base voltage leads the input voltage by an amount of ___________ when the operating frequency is higher than the cut-off frequency

About 90 degrees

75. Which is used to protect during excessive load voltage

Crowbar

76. When the load is shorted, the pass transistor produces the least power dissipation when you use

Foldback limiting

77. In dual mode npn transistors, which side is the emitter

Either sides

78.

 

Complete List of Section 2 Modules in Electronics (Q&A)


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