Electronics Engineering Review Materials: Section 2 Module 22

This is the Section 2 Module 22 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 22

This is the Section 2 Module 22 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 22

Question

Answer

1. Typical Resistivity of insulators

1 x 109 to 1 x 1025

2. Typical Resistivity of conductors

1 x 10-6 to 1 x 10-4

3. Typical Resistivity of semiconductors

1 x 10-4 to 1 x 109

4. Forward biasing a PN junction diode

Reduces its barrier potential

5. Reverse biasing a PN junction diode

Increases its barrier potential

6. Which of the following is a natural intrinsic semiconductor?

InP

7. The arrow in a transistor symbol indicates?

Hole flow

8. Resistance of a CB configuration goes

From low resistance to high resistance

9. What is this theory ”” insert meaning of substitution theory here

Substitution Theory

10. Superposition theory is only applicable in devices that are?

Linear and bilateral

11. Peak inverse voltage of a diode is

1000V

12. Forward break over value of a silicon diode rectifier is

600A

13. If inductors are used as heating coils, they are placed in what arrangement in order to be heated at maximum?

All in Parallel

14. A small increase in the internal resistance of an amplifier corresponds to?

Small Decrease in voltage gain

15. Transistor early effect uses what principle

Base narrowing

16. The main current in a normally biased NPN transistor is

Drift current

17. The source voltage of a half wave rectifier circuit is Vm the maximum value of the voltage across the diode is?

Vm

18. A half wave rectifier works only for?

Less than half of the cycle

19. A full wave rectifier works for?

Half of the cycle

20. What will happen if the operating point was moved closer to the cut-off region

The output will show distortions

21. What must be done to increase the current passing through a PN junction

The recombination of electrons and holes must decrease

22. Why must the emitter be heavily doped?

In order to give out maximum power

23. Transformer coupled class A amplifier has an efficiency of?

50%

24. The Q point is located in the center of the dc load line?

So that only small dc voltage is needed

25. The output of a common emitter circuit is?

Out-of-phase

26. A zener diode has?

A negative resistance

27. It points to the address of the next instruction to be run?

Program counter

28. Which element has transition temperature of 72.6K

Lead

29. What is the conductivity of annealed silver?

108.8%

30. What is the conductivity of 99.99% gold

72.6%

31. Which of the following is not usually used to label potentiometer?

Blue

32. 1 Kwh is equal to?

850kcal

33. Which resistor is most effective in high frequencies?

Film Type

34. What will happen to the output signal if the operating point is in the saturation region?

The output might be driven intro thermal runaway

35. What is the conductivity of 99.95% aluminum?

63%

36. Improper biasing causes

Distortion in the output signal

37. Potentiometer – “always counterclockwise limit”

Yellow

38. Potentiometer – “always clockwise limit”

Green

39. Potentiometer – “Wiper”

Red

40. Transformer coupling of class A amplifiers is done to increase

Efficiency

41. The most noticeable effect of a small increase in temperature in a CE arranged transistor is?

Increase in ICEO

42. PNP transistor with normal bias

The emitter-base junction is forward biased and the collector-base junction is reversed biased

43. In a PNP transistor electron flows into

The collector and base leads

44. The emitter current in a junction transistor is

Designated at ICO

45. Transistor terminal voltage is positive if

The terminal is more positive than the common terminal

46. Conductivity of pure annealed copper

102.1%

47. The space charge region In a junction diode contains charges that are called

Fixed donor and acceptor

48. Common Emitter arrangement of transistor has

Medium input resistance high output resistance

49. If PN junction bias voltage is increased from zero to a higher value current flow increase rapidly due to a small value of voltage

Only after the forward bias exceeds the potential barrier

50. If PN junction bias voltage is increased from zero to a higher value current flow increase rapidly and will result to a small value of voltage

If Minority carriers are enough to cause an avalanche breakdown

51. The main difference of an NPN transistor and a PNP transistor is that

The emitter injects the region with holes in PNP and with electrons in NPN

52. Beta plot

VCB vs IC with constant IB

53. High resistance of reversed bias is due to

Large change in collector voltage causing little change in collector current

54. Minority Carriers crossing the junction depends on

The magnitude of the potential barrier

55. Which of the following types of resistor is not used for frequencies above 50kHz

Wirewound

56. The emitter of an PNP transistor is more heavily doped that the base

So that the flow across the region is due to the holes

57. Volt ampere plot in Common Base

VCB vs IC for constant IE

58. The register that holds the location of the current instruction being executed

Instruction Register

59. Capacitance of a PN junction

Increases as reverse bias decreases

60. Capacitance of a reversed bias PN junction

Depends mainly on the reverse saturation current

61. Transistor terminal is positive if

Electron flows out of the terminal

62. A small increase in collector reverse bias voltage will

Increase collector current

63. Class of superconductor with transition temperature at 30K

First Class

64. Which of the following does not refer to the number of instructions per second

Interrupt

65. The Quiescent state of a transistor is

When no signal is applied at input

66. CE Volt ampere plot

VCB vs IC with constant IB

67. Avalanche occurs

If reverse bias exceeds certain value

68. Temperature at which there is a complete absence of molecular motion

Absolute zero

69. It is a high level language that is function oriented that is capable for low level machine control

C Language

70. A Principal node is

A junction where branch currents can recombine and divide

71. The difference of a mesh current and a branch current is

A mesh current is an assumed current and a branch current is an actual current and mesh current does not divide at a branch point

72. In a CE transistor current gain, the collector voltage is held constant so that

Changes in collector current is due to change in base current

73. ICBO

Increases with temperature

74. Silicon is doped with ____ in order to have electrons as its majority carriers

Antimony

75. Transistor action

Base region should be narrow

76. In an unbiased PN junction in equilibrium current is

Zero, because of equal but opposite direction of carriers crossing the junction

77. In reverse saturation current

Only minority carriers are crossing the region

78. In a PN junction if the current is zero

The number of majority carriers equals the number of minority carriers crossing

79. CE input volt ampere plot

VCB vs IB with constant VCE

80. ICBO flows

In the collector and base leads

81. ICEO is

Collector current with base current equals zero

82. In a forward biased PN junction

Only majority carriers is injected into the region

83. In PN junction holes diffuse from P region to N region because

The concentration of holes are greater in the P region than in the N region

84. Compared to CB, CE has

Higher current amplification

85. Water heater requires 1000kWh to be heated if there is 25% of energy loss the total energy must be equal to

1333kWh

86. A round wire increase from gauge 1 to 40

The diameter and are decreases

87. LED uses

Reverse bias junction

88. Positional barrier at PN junction is due to

Fixed donor and acceptor

89. Diode barrier potential offers opposition only to

The majority carriers

90. Signal handling capacity of an amplifier is high

If the operating point nears operating point

91. ICBE

Flows in reverse direction to the collector with the emitter open

92. The increase of formation of holes and free electrons with an increase in temperature

Thermal carrier generation

93. Which has more resistance 100m no 12 copper wire or 100m no 12 aluminum wire

100m no 12 aluminum wire

94. DC load line

Has a negative slope

95. Positive swing clips the output

Towards the cutoff region

96. If positive voltage signal is applied to a base of a normally biased NPN

The collector voltage becomes less positive

97. The emitter of a normally biased transistor

Has low resistance

98. If the collector dissipation is zero the Q point increases with excitation in

Class B

99. If a KVL is taken not in the complete loop the total voltage

Is the sum of voltages form the start point to the end point

100. Which of the following is not true about 0K

The valence and conduction band of an intrinsic semiconductor overlaps

101. Aluminum has a transition temperature of

1.2K

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


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