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Electronics Engineering Review Materials: Section 1 Module 24

Electronics 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. 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 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

70,700

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

JFET

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

(IGFET, D-MOSFET, E-MOSFET)

all of the above

21. Efficiency of a series fed class A amplifier

25%

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

2V

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

200,000

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

o

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

JFET

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

4

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?

1

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?

MOSFET

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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