Assessment Test


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1. In an exclusive OR gate, the output is high _______.

 
 
 
 

2. When transistors are used in digital circuits they usually operate in what region?

 
 
 
 

3. To operate properly, a transistor's base-emitter junction must be forward biased with reverse bias applied to which junction?

 
 
 
 

4. Often a common-collector will be the last stage before the load; the main function(s) of this stage is to_______.

 
 
 
 

5. For a C-C configuration to operate properly, the collector-base junction should be reverse biased, while forward bias should be applied to which junction?

 
 
 
 

6. If an input signal ranges from 20-40 µA (microamps), with an output signal ranging from .5-1.5mA (milliamps), what is the ac beta?

 
 
 
 

7. The content of a simple programmable logic device (PLD) consists of? A. Advanced sequential logic function.

 
 
 
 

8. A VU meter would not generally indicate _______.

 
 
 
 

9. Which of the following would not be indicated by the oscilloscope?

 
 
 
 

10. How would an electrical insulator be made a conductor?

 
 
 
 

11. The movement of holes in a semi-conductor would __________.

 
 
 
 

12. A backward – working electric motor , in which mechanical rotation is converted to electricity is best described as ______.

 
 
 
 

13. A fluctuating magnetic field would _______.

 
 
 
 

14. The bar or the rectangle portion of a diode symbol represents the _________.

 
 
 
 

15. When a forward and reverse resistance of a transistor is getting opposite reading, it indicates the transistor is _________.

 
 
 
 

16. In what mode does a JFET operates?

 
 
 
 

17. A lead-acid battery may become hotter than normal during a charge if the _________.

 
 
 
 

18. The main reason for doping a conductor is to _________.

 
 
 
 

19. LEDs made of gallium phosphate produce a visible _________.

 
 
 
 

20. What are the three leads of a TRIAC?

 
 
 
 

21. What might be the cause if the pointer fails to return to “ 0 “ when a megger tester is disconnected?

 
 
 
 

22. Tightly metal braid wire can be used with a printed circuit board especially when __________.

 
 
 
 

23. During maintenance, to test fuses in an unenergized circuit, you should use a _________.

 
 
 
 

24. A Zener diode’s power dissipation rating is usually given for a specific operating _________.

 
 
 
 

25. What would happen if one diode of a full wave rectifier has burned out in a shorted condition?

 
 
 
 

26. What are the things to consider to understand how the output voltage is shaped by a differentiator?

 
 
 
 

27. What type of filter is an RC differentiator?

 
 
 
 

28. What happen to the RL differentiator when the input pulse goes from its low level to high level?

 
 
 
 

29. What is the output average value of an RC differentiator responding to a repetitive pulse?

 
 
 
 

30. Where is the output of an RC integrator taken?

 
 
 
 

31. In an RC differentiator, at any instance what must be the sum of the capacitor voltage and the resistor voltage?

 
 
 
 

32. What will happen to the capacitor charging if the RC time constant of an integrator is increased?

 
 
 
 

33. If a periodic pulse waveform has a pulse width and the time between each pulses is equal to or greater than five times constant, the capacitor will _________.

 
 
 
 

34. In electronic systems, repetitive-pulse waveforms are encountered _______.

 
 
 
 

35. How is the capacitor charging in an RC differentiator?

 
 
 
 

36. You need a very efficient thyristor to control the speed of an AC fan motor. Which of the given is the best to be used?

 
 
 
 

37. You have the schematic diagram of several types of circuits. Which of these circuits most likely uses a TRIAC?

 
 
 
 

38. When the inputs or load varies within limits what will the voltage regulator keep?

 
 
 
 

39. What is the range of the voltage level of the LM317 adjusted voltage regulator?

 
 
 
 

40. What is the typical dropout voltage for the 7812 fixed positive voltage regulator?

 
 
 
 

41. What is the purpose of an additional RC filter section in a power supply circuit?

 
 
 
 

42. What is a basic type of regulator which is less efficient but offers an inherent short-circuit protection?

 
 
 
 

43. What is a basic type of regulator which is inherently efficient because the current flows through both the regulator and the load?

 
 
 
 

44. In a simple series regulator circuit, which of the following components is the controlling element?

 
 
 
 

45. In an improved shunt regulator, which of the following components sets the reference voltage?

 
 
 
 

46. How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged?

 
 
 
 

47. Which components set the voltage across the load in a basic transistor shunt regulator?

 
 
 
 

48. Across which of the following components of a power supply does the average DC voltage exist?

 
 
 
 

49. Switching regulators are more efficient than linear regulators. This is particularly useful in when pertaining to voltage applications?

 
 
 
 

50. Switching regulators are more efficient than linear regulators. This is particularly useful in when pertaining to current application?

 
 
 
 

51. What range of load current can voltage regulators be selected for operation?

 
 
 
 

52. In a shunt linear regulator, what is the control element that is in parallel with the load?

 
 
 
 

53. In a series linear regulator, what is the control element that is in series with the load?

 
 
 
 

54. Which of the following components does not have cathode terminal?

 
 
 
 

55. Which of the following component has a negative-resistance region in its characteristics curve?

 
 
 
 

56. How many terminals does a programmable unijunction transistor (PUT) have?

 
 
 
 

57. How many opto-isolators does an ISO-LIT Q1 16-pin Litronix opto-isolator DIP have?

 
 
 
 

58. How many terminals does a Shockley diode have?

 
 
 
 

59. What is the range of the variable resistor in the equivalent circuit of a unijunction transistor?

 
 
 
 

60. Which one of the SCR terminals fires the SCR?

 
 
 
 

61. Which of the following devices has the smallest turn-off time?

 
 
 
 

62. Which of the following devices has nearly the same turn-on time as turn-off time?

 
 
 
 

63. Which of the transistors of an SCR are conducting when the SCR is fired and is in the conduction mode?

 
 
 
 

64. For an SCS, what pulse at the anode gate turns the device on?

 
 
 
 

65. For an SCS, what pulse at the anode gate turns the device off?

 
 
 
 

66. Which of the following parameters are usually provided by the manufacturer on the specification sheet for SCRs? I. Turn-on time II. II. Turn-off time III. III. Expiration time

 
 
 
 

67. Which of the following parameters are usually provided by the manufacturer on the specification sheet for SCRs? I. Turn-on time II. Expiration time III. Junction and case temperature

 
 
 
 

68. Which of the following parameters are usually provided by the manufacturer on the specification sheet for SCRs? I. Turn-on time II. Turn-off time III. Junction and case temperature

 
 
 
 

69. Which of the following area/s is/are applications of an SCS? I. Counters II. Pulse generators III. Mirror-image insertion

 
 
 
 

70. Which of the following area/s is/are application of an SCS? I. Counters II. Mirror-image insertion III. Voltage sensor

 
 
 
 

71. Which of the following does not affect the junction capacitance of a diode?

 
 
 
 

72. What happens if the reverse bias exceeds the avalanche voltage in a P-N junction?

 
 
 
 

73. When a P-N junction is forward-biased, conduction will not occur unless ______.

 
 
 
 

74. The avalanche voltage is routinely exceeded when a P-N junction acts as a _____.

 
 
 
 

75. In a P-type material, electrons are _________.

 
 
 
 

76. A semi-conductor material is made into N-type by _______.

 
 
 
 

77. When a diode is forward-biased, the anode voltage _______.

 
 
 
 

78. A photodiode, when not used as a photovoltaic cell has ______.

 
 
 
 

79. Emission of energy in an infrared (IRED) is caused by ______.

 
 
 
 

80. The electrical power that a solar panel can provide in direct sunlight depends on all of the following EXCEPT ______.

 
 
 
 

81. An advantage of a full-wave bridge rectifier is the fact that ______.

 
 
 
 

82. In a power supply designed to provide high power at low voltage, what would be the best rectifier circuit?

 
 
 
 

83. What is the principal disadvantage of a voltage doubler power supply circuit?

 
 
 
 

84. Which type of fuse having only straight length of wire or metal strips inside?

 
 
 
 

85. When transistor is conducting as much as it can, it is said to be __________.

 
 
 
 

86. The bipolar transistor configuration most often used for matching high input impedance to low output impedance puts signal grounds at _______.

 
 
 
 

87. In a common base circuit, the output is taken from ______.

 
 
 
 

88. The optimum capacitance values in an amplifier circuit depend on ___________.

 
 
 
 

89. In Boolean algebra, addition represents the logical_________.

 
 
 
 

90. If the output to a logical inverter is low, it means that ________.

 
 
 
 

91. If one of the inputs to a two-input NOR gate is high, what is the output state?

 
 
 
 

92. Which of the following logic gate would function similar to an electrical circuit connected in parallel?

 
 
 
 

93. Which of the following logic gate would function similar to a series connection in an electrical circuit?

 
 
 
 

94. If one of its two-input logic signal is high, then the output signal is high, this statement would describe the _______.

 
 
 
 

95. If one of the two more input logic AND is low, what is the output state?

 
 
 
 

96. Which of the following logic gate would have only one input and one output

 
 
 
 

97. Logic gates are combined to form circuits with many inputs and outputs, a complex combination of logic gates are sometimes called _________.

 
 
 
 

98. Which of the listed logic gates changes state of the input logic?

 
 
 
 

99. Which of the following output state of a two or more inputs of an AND gate?

 
 
 
 

100. What is the state of the output of a logic NOR gate?

 
 
 
 


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