Electronics Engineering Review Materials: Section 1 Module 24

This is the Section 1 Module 24 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 1 Module 24


Electronics Engineering Reviewers: Section 1 Module 24

1. In an RC coupled class A amplifier

- ac loadline is steeper than ac loadline

2. The movable arm attraction-type relay is called

- armature

3. When the collector current of a transistor is zero, the transistor is

- cut-off region

4. The polarity of an induced voltage is determined by

- Lenz law

5. The equivalent series resistance of a capacitor is ideally

- zero

6. When using ohmmeter, to measure the continuity of a wire,the resistance should be for faulty (open) wire

- zero for good wire, infinite

7. Differentiator has a circuit of which the

- output is proportional to change in input

8. Integrator is a circuit of which the

- output changes original voltage with new change in voltage

9. Which transistor configuration hybrid parameter is usually specified by the manufacturer

- common emitter

10. The induced voltage in the inductor

- leads the current by 90°

11. If an OP AMP, open loop voltage gain is 100,000, the voltage gain at the open loop cut-off frequency is


12. In MOSFET, it is the foundation upon which the circuit is constructed or formed from a silicon base

- substrate

13. The magnetic field surrounding a solenoid

- like a permanent magnet

14. Which of the following material is non-magnetic

(wood, plastic, glass)

- all of the above

15. A voltage follower is

(low output impedance, high input impedance, voltage gain of 1)

- all of the above

16. What FET in which the gate electrode consist of a PN junction


17. Transformer cannot be used as

- to step up or down of dc

18. The current that flows in a channel of a JFET when the gate-source voltage is zero

- Drain-saturation current

19. Which of the following cell is secondary cell

- lead-acid

20. FET that has a substate


- all of the above

21. Efficiency of a series fed class A amplifier


22. Highest gain of OP AMP

- Open loop gain

23. Highest cross sectional area

- AWG #12

24. When increasing the frequency of 500Hz to two octaves corresponds to

2 KHz

25. To minimize arcing, resistance should be added to reduce the current in

- armature winding

26. A 2200 uF, with a voltage rating of 35V is likely to be a/an

- electrolytic capacitor

27. In class B amplifier, the operating or Q point is at

- cut-off

28. Output complementary stage of OP AMP

- common collector

29. Open fuse has a resistance value approaches

- infinity

30. The output of an unfiltered half wave/full wave rectifier

- pulsating dc

31. The best way to bias a transistor amplifier

- diode bias

32. What type of meter is used to measure ac current without breaking/opening the circuit

- amp clamp probe

33. A transistor in which one or both electrodes are created by diffusion

- diffused transistor

34. A comparator does not uses

- negative feedback

35. Emitter dc current of transistor in differential amplifier

1/2 of tail current

36. What will happen to the gain of amplifier when used in high frequency

- it will decrease

37. What will happen to the leakage current when reverse current increases

- increase exponentially

38. Typical value of forward voltage of LED


39. Which has higher resistance, 10 MΩ DOM or 500 kΩ/volt rating analog VOM

- analog VOM

40. To make the commercial magnet last indefinitely

it must not be subjected to (high temp., physical shock, strong demagnetizing force)

- all of the above

41. The orientation of magnetic field in vertical wire

- like that of permanent magnets

42. The base of BJT serves what purpose in FET

- gate

43. Swamping resistor in common emitter -

44. Which has unity voltage gain

- common collector

45. Disadvantage of common base

- low input impedance

46. Input stage of 741 OP AMP

- differential amplifier

47. Output stage in every OP AMP

- push pull amp

48. Open loop gain of 741 OP AMP


49. What current flows when VG=0

- source-drain current

50. What is the value of VD when ID=0

- equal to pitch-off voltage

51. Bridge where there are diodes in 2 arms and resistor in the other

- Half bridge

52. Must be consider when diode is used in high ac voltage

- average resistance

53. Phase angle of the high pass filter at passband frequency


54. Value of by pass capacitor must be consider for the Xc

- one tenth or less of the parallel  resistance at the lowest frequency to be bypassed

55. Typical value of semiconductor resistivity

10 to 104

56. Which has negative temperature coefficient?

- carbon

57. Lowest output impedance

- common collector

58. FET with gate P-N junction


59. A semiconductor device, a p-n junction formed by alloying a suitable material such as indium with the semiconductor

- alloy junction

60. Capacitor which explodes with wrong polarity

- aluminum electrolytic

61. When the secondary winding is shorted

- increase primary winding inductance

62. Circuit which uses capacitor

- clamper

63. In DPST, how many terminals should be solder


64. Internal resistance of voltmeter

- very high

65. Comparator that uses positive feedback

- Schmitt trigger

66. Input impedance of MOSFET

- higher than JFET

67. In solving thevenin’s resistance,

- short all sources

68. What happen in DC series motor if the load release

- motor overspeed

69. How many equations made with 2 principal nodes?


70. Which has highest leakage current?

- electrolytic

71. left hand rule for solenoid

- the left hand encircles the coil in the direction of electron flow, then the thumb points to north pole

72. equivalent circuit of triac

- 2 parallel SCR

73. diac is

- two terminal, bidirectional switch

74. output of C-size alkaline cell

- 1.5V

75. combination of many diode in a single housing

- diode array

76. drain and source can be interchange

- symmetrical JFET

77. Emitter follower is also called as

- common collector

78. In residential house wiring, the color of hot wire

- red and black

79. For best results, time constant in RC filter should be

- long

80. Inconvenient and time consuming in troubleshooting

- current measurement

81. What is slew rate?

- maximum rate at which voltage in op amp

82. Amplifier use in pulse operation

- class D

83. When the base-emitter is forward biased and base-collector is forward biased

- cut-off

84. Decrease of gain in increasing frequency

- roll- off

85. Main difference of BJT and FET

- BJT is current controlled while FET is voltage controlled

86. What FET originally has no current?


87. The induced voltage in solenoid

- leads the current

88. The curve of current vs. Voltage in specific temperature

- characteristic curve

89. When multiplying complex number in polar form

- multiply the magnitude and add the angles

90. Commonly used in emergency equipment batteries

- silver zinc cells

91. Increasing size of electrode -

increases rin of the resistance

92. When discharging, hydrogen are attracted in the anode of the primary cell due to

- negative charge caused by a loss of electrons

Section 1 Modules: Reviewers in Electronic Engineering

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