Electronics Engineering Review Materials: Section 1 Module 4

(Last Updated On: December 8, 2017)

Electronics Review Materials: Section 1 Module 4

This is the Section 1 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 1 Module 4

1. The basic requirement of a dc armature winding is that it must be.

A closed one

2. A wave winding must go at least ____ around the armature before it closes back where it started

Twice

3. The primary reason for making the coil span of a dc armature winding equal to a pole pitch is to.

Distribute the winding uniformly under different poles

4. The sole purpose of a commutator in a dc generator is to.

Convert the induced ac to dc

5. A thermocouple.

Gets warm when current flows through it.

6. In a linear meter, half scale deflection occurs when there is ____ percent of the rated current through its coil.

50

7. Digital instruments are those which.

Have circuitry of digital design

8. The basic meter movement can be converted into an ohmmeter by connecting a ___ with it.

Battery and a variable resistance in series

9. The D’ arsonval meter movement can be converted into a audio frequency ac ammeter by adding a _____ to it

rectifier

10. In small dc machines, armature slots are sometimes not made axial but are skewed. Though skewing makes winding a little more difficult, yet results in,

Quilter operations and slightly decrease in losses.

11. For a Q point near the center of the dc load line, clipping is more likely to occur on the,

Negative peak of output voltage

12. The dc armature winding in which coil sides are a pole pitch apart is called ____ winding

Full- pitch

13. For making coil span equal to a pole pitch in the armature winding of a dc generator, the back pitch of the winding must equal the number of

Commutator bars per pole

14. 339 IC function as.

Comparator

15. How many comparators does a 339 IC contains?

4

16. AC compound generator usually has lower resistance.

Series field winding

17. BIMOSFET circuit.

Bipolar and mosfet circuit

18. Advantage of MOSFET over FET

MOSFET can handle wide range of gate voltage.

19. Class A maximum efficiency

50%

20. SCS terminals

4

21. MOSFET terminals

3 or 4

22. Limited to negative resistance region

Phototransistor

23. Graph of AC emitter current and ac base-emitter voltage.

Diode emitter

24. PUT programmable unijunction transistor terminals

3

25. Amplifiers generally used for radio communications

Class C

26. Power dissipation is the product of load output voltage and

Load current

27. Sellen key filter is also known as

VCVS filters

28. Reference component of improved shunt regulator

Zener diode

29. Short circuit drops at terminals

0V

30. Has low input impedance

Common – base

31. Does not have capacitance which affects by the miller effect

Common- base

32. Why are the field poles and armature of dc machine laminated

To reduce eddy current

33. Peak value of tunnel diode

600mV

34. Voltage regulation for LM7812

12V

35. Quality factor of crystal

20,000

36. If the rotation of a motor runs slower than normal this is due to

Worn bearing

37. In emitter bias, the voltage across emitter resistor is the same as the voltage between emitter and

Ground

38. Main feature of universal motor

Highest kW/kg ratio

39. Single phase run motor

Not self starting

40. If gate more negative in an N-channel FET, what happened to channel with depletion layer

Shrinks

41. In the drain curve, the more horizontal the graph is

Greater output impedance

42. Displays harmonic distortion

Spectrum analyzer

43. Material used in tunnel diode semiconductor

Gallium and germanium

44. In BJT amplifier, ____ gain has the value of less than 1 to 1000

Current

45. Number of impurities of donor

5

46. Use to isolate the input from the output

Optocoupler

47. Schottky diode operated in

20GHz

48. Typical value of the external frequency compensating capacitor of op-amps.

3.0 – 30 uF

49. Main feature of a universal motor

Can operate in ac and dc

50. Characteristic of a BIFET

Has high input impedance

51. Bulk resistance of 1N4001

0.23 ohms

52. The smallest switch off time

LASCR

53. Maximum current rms rating of LASCR today

3A

54. Does not have a cathode terminal

TRIAC

55. What amplifier has the lowest efficiency?

Class A

56. Class B push-pull amplifier avoid

Cross over distortion

57. E-MOSFET at cut-off is a

Switching device

58. Monostable 555 timer has ___ stable state

1

59. Repulsion motor is equipped with ___

Commutator

60. Control the open loops cut-off frequency

Compensating capacitance

61. Howland produce ___

Unidirectional single ended load current

62. Repulsion start induction run capacitor motor runs as a induction motor when

Commutator segments are shorted

63. ICVS amplifier has no output voltage due to ____

Shorted feed back resistor

64. Starting winding is placed on ____

Stator

65. Source of mechanical force for rotating alternator, ac, dc, large and small ____

prime mover

66. Approximation of maximally flat pass band

Inverse chebysev

67. At low frequency coupling capacitor decreases ____

Voltage gain

68. The gate current of a FET in dc analysis

0A

69. In audio system, reference accepted level ____

1mW

70. If the load is shorted the pass transistor has a lowest power dissipated when the regulator has ____

Foldback limiting

71. To improve the high frequency response of an amplifier

Shorten leads as much as possible

72. Carriers participate in injection process in unipolar device

1

73. Has negative resistance region

Unijunction transistor

74. A transistor has how many layer

3

75. In foldback current limiting load resistance increases, load voltage ___

Increases

76. Advantage of JFET is the fact that it is ___ controlled rather than ____ controlled

dc, ac

77. Sallen key equal component second degree order determines

Voltage gain

78. Single phase induction motor when removed from power supply it will only run on the ____ winding

running

79. Small collector current with zero base current is due to the leakage current of

Collector diode

80. In a dual diode NPN transistor the cathode can be found in

Either of the emitter diode

81. Frequency operation of capacitor connected in parallel with ideal diode

Very high frequency

82. In BJT, ____ frequency has two value important capacitance are the electrode between the internal

High

83. In proper design, ___ can be introduced to the voltage controlled JFET resistor

Thermistor

84. Zero crossing detector with hysteresis ____

Has no feedback

85. In an ICVS op-amp load current approaches zero has load voltage approaches

Infinity

86. If the load resistance is open the AC external emitter resistance is equal to

DC Emmiter resistance

87. A permanent spilt single phase induction motor don’t have this ____

Centrifugal switch

88. In VDB circuit collector resistance increases, collector voltage ____

Increases

89. In the input RC circuit in first stage BJT, by how many does the base voltage leas input voltage of frequency larger than the cut-off frequency in no frequency region?

About 90 degree

90. Capacitor start induction run is connected in series with ____ winding

Starting

91. To increase the output voltage of a bulk switching regulator ____

Increase the duty cycle

92. Protection from over power supply ____

Crowbar

93. It determine the resonant frequency of a crystal ___

The thickness and the size

94. In a closed loop voltage gain is equal to

The feedback resistor divided by input resistance

95. To reverse the direction of rotation of the single phase induction motor

Reversing connection in the starting winding

96. In VCVS circuit a decrease in output voltage has an increase in

Error voltage

97. A two value capacitor for single phase motor

Paper spaced oil filled capacitor

Section 1 Modules: Reviewers in Electronic Engineering

Electronics Engineering Review Materials: Section 1 Module 4
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