Electronics Engineering Review Materials: Section 2 Module 10

This is the Section 2 Module 10 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 10

This is the Section 2 Module 10 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 10

Question

Answer

1. In a voltage divider BIAS npn transistor, if the lower voltage divider resistor the one connected to ground opens

a transistor maybe driven into saturation.

2. The minimum anode current that keeps a thyristor turned on is called

a holding current.

3. The miller input capacitance of an amplifier is independent in part on

the voltage gain.

4. Instrumentation amplifier is used in primarily

high noise environment.

5. Voltage typical of a dry cell is

1.5V.

6. An amplifier that operates in a linear region at all times is

Class A.

7. Square wave out of an emitter follower implies.

clipping on both peaks

8. A zero level detector is one application of a.

comparator

9. A sin wave

always has the same general appearance.

10. Each of the ff statements regarding a shaded pole motor is true except

it has high starting torque.

11. If a band pass capacitor is open, the ac input voltage will

remain the same.

12. The appearance of RF current oscillations in a DC bias flop of n type Gallium Arsenide in a 3.3kV electric field.

Gunn Effect.

13. What is an example of elemental semiconductor?

Germanium

14. In a phototransistor, the base current is

directly proportion to light.

15. If the emitter bypass capacitor opens, the ac output voltage will

decrease.

16. The gate-source diode of a JFET should be

reversed bias.

17. A relay is connected to a circuit so that the device gets a signal only when a relay coil carries current. A relay is probably

normally open.

18. A Darlington transistor has

very high current gain.

19. Common types of thyristors include

DIACs and TRIACs.

20. In which of the ff places would a lantern battery be found?

Two-way portable radio.

21. Speed of universal motor is

dependent on frequency of supply.

22. Admittance is a measure of the east in which a circuit ???

 

23. The derivative of sine wave is

a representation of rate of change.

24. The minimum input current that can turn on a thyristor is called a

Trigger current.

25. A latch always uses

positive feedback.

26. Lowest frequency passed by a low pass filter.

0 hz

27. Reducing all dc sources to zero is one of the steps in getting the

ac equivalent circuit.

28. Class A amplifier are almost always

tuned rf amplifier.

29. Base voltage 2 supply emitter bias is

near 0V.

30. A 4 layer diode turns ON when anode to cathode voltage exceeds

forward turn on over voltage

31. Varactor diode exhibits

variable capacitance that depends on the reverse voltage.

32. The critical resistance of dc generator is the resistance of

windshield.

33. When an op-amp is operated in single-ended mode,

both inputs are connected together.

34. NiCad memory doesn’t???????

 

35. A device commonly used for remote switching of wire communication signal is

a relay.

36. Diode whose negative resistance depends on a specific form of quantum mechanical bond structure of a material.

Gunn diode

37. Crystal set.

requires no battery

38. At cut-off, the gate-channel is

completely close by the depletion region.

39. Tsep the collector voltage will.

equal to collector supply voltage

40. A clipper circuit wherein the diode is connected in series with the load is

series clipper.

41. The starting torque of a capacitor start induction motor is directly related to the

angle between two winding currents by the relation of sin alpha.

42. The geomagnetic field is

what makes the compass work.

43. The commercial efficiency of a shunt generator is maximum when its variable loss is.

equal to constant loss

44. When the PN junction of a semiconductor diode is inserted with an intrinsic material the diode becomes.

a PIN diode

45. When the emitter resistance increases with ??.

the collector voltage will increase

46. What refers to the type of special diode which is capable of both amplification and oscillation?

Tunnel diode.

47. Compensating winding is employed in an ac series motor in order to

reduce effects of armature reaction.

48. Maximally flat frequency response is known as.

butterworth

49. The series field of a short shunt DC generator is excited by.

load current

50. A small signal amplifier uses only

a small portion of its loadline.

51. Usually,

large motor is more efficient than a small one.

52. The efficiency of a tiny motor use in a wrist watch is approx.

1%.

53. An advantage of electromagnet over permanent magnet is that

an electromagnet can be switch on and off.

54. An air variable capacitor might have a range of

pf-100pf.

55. The main difference between a lantern battery in a transistor battery is

a lantern battery has more energy capacity.

56. The current sensitivity of a needle is expressed in

ohm/volt.

57. Push-pull is almost always use with

class b.

58. Three phase ac

has 3 wave all of the same magnitude

59. Lap winding is suitable for ___current ____ voltage dc generators.

High, low

60. `At a freq of 400Hz, the most likely form of an inductor will be

toroidal.

61. Ideally, the equiv circuit of a FET contains the

current source between drain and source terminal.

62. A zero to one mA meter has the sensitivity of

1kOhm/volt.

63. Which of the ff correctly states Ohm’s Law?

Ohms=volt/ampere

64. A sine wave contains energy at

just 1 frequency.

65. Which of the ff motors is an interesting example of beneficiary utilizing a phenomenon that is often considered undesirable?

Hysteresis motor.

66. The main advantage of CMOS is its

low power consumption.

67. The conductor is used xerograph in

Selenium.

68. In a DC generator, the generated EMF is directly proportional to

pole flux.

69. `What diode is especially process so that its high current flow takes place when the junction is reverse biased. It is a variation of tunnel diode.

Backward diode.

70. The magnetic flux around a straight current carrying wire is

stronger near the wire.

71. Inductors in series assuming there is no mutual inductance combine

like resistors in series.

72. If in case of a certain DC armature, the number of commutator segments is found either 1 less or more than a number of slots, the armature must be having a

simplex wave winding.

73. What type of read diode uses a heavily dope n-type material as its depletion region.

IMPATT diode.

74. The cathode of a zener diode in a voltage regulator is normally

more positive than the anode.

75. The sum of the voltages going around a dc circuit but ?? including the power supply has

equal value but opposite polarity from the supply.

76. The maximum efficiency of a class B push pull amplifier is

70.5%.

77. A substance with a high retentivity is best suited for making a

Permanent magnet.

78. The constant current area of a FET lies between.

pinch-off and breakdown

79. In a differentiator, the feedback element is

a resistor.

80. The resistance of a semiconductor is known as

Bulk Resistance.

81. Which of the ff type of capacitor is polarized?

electrolytic capacitor.

82. A cascode amplifier has an advantage of

low input capacitance

83. A positive ion is formed when.

valence electron breaks away from the atom

84. An AC electromagnet

will attract pure unmagnetized iron

85. For an electroluminescent ??, which semiconductor is best?

Gallium Phosphide

86. Where would you most likely find a lead-acid battery?

Portable videocamera or recorder.

87. The ac load line is the same as dc load line when the ac collector resistance is

equal to DC collector resistance.

88. To reduce the distortion in a common emitter amplifier,

reduce the ac base control.

89. For operation as amplifier, the base of an NPN transistor must be

reduce the ac base control.

90. The main difference between electronics and electrical instruments is that the electronic instruments contain

an electronic device.

91. Negative feedback

increases the input impedance and the bandwidth.

92. A BJT class B push-pull amplifier with no transformer coupling uses

Complimentary symmetry transistor.

93. A current going into a point in any circuit is always equal to the current

flowing out of that point.

94. The frequency at which the amplifier gain is 1 is called the

unity gain frequency.

95. In DSEB, the base current must be

very small.

96. The geomagnetic lines of flux

are horizontal at the geomagnetic equator.

97. At a freq of 95Mhz, the best form of inductor will be

air-core.

98. The positive lead of an ohmmeter is connected to the anode of the diode and the negative lead is connected to the cathode, the diode is

Forward biased.

99. A triangular wave

has equal rise and decay rates.

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


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