Electronics Reviewer 1

91 Items

1. What is the common characteristic of a step-up transformer?

Primary voltage is lower than secondary voltage

2. What is the common characteristic of a step-down transformer?

Primary voltage is higher than secondary voltage

3. What measures the radiation in the Sky?

Pyranometer

4. What is the advantage of Magnetic Disk over Magnetic Tape?

Easy storage and easy retrieval

5. What best represents X leads Y by 270 degrees?

X lags Y by 90 degrees

6. What motor has the lowest starting torque?

Shunt motor

7. Advantage of JK over RS flip-flop?

More Predictable outcomes

8. Disadvantage of CMOS?

Easily damaged by Static Electricity

9. Why is Carbon brushes preferred over Copper Brushes?

It has less arcing

10. What is a fuse that is composed of a straight wire inside?

Quick blow fuse

11. What does R/Z represents?

Power factor

12. If X is high, in a NAND circuit what is Y?

Low

13. Where are LED’s commonly seen among the choices?

Digital Frequency Display

14. What do you need to vary the frequency of a crystal oscillator?

Variable Capacitor

15. What happens to the resistor ratio when the secondary voltage is quadrupled?

1:6

16. What is a flip-flop that is triggered at the same time?

Clocked flip-flop

17. What diodes are commonly used in a Microwave Transmission?

IMPATT diode

18. What reduces the gain in an OP-AMP?

Negative Feedback

19. Which does not affect the Capacitance in a Capacitor?

Frequency (Within Reason)

20. What does FTP abbreviate for?

File Transfer Protocol

21. What do you need to connect a microcomputer to a network?

Network Interface Card

22. Comprises of SSCP, PU and LU?

System Network Architecture

23. What circuit protects from overvoltage?

Crowbar Circuit

24. What is the ripple frequency of a full-wave Rectifier?

Twice that of a half-wave Rectifier

25. What controls the firing of SCR?

Trigger Circuit

26. A class A amplifier has

360 degrees of input cycle

27. In a parallel circuit, how does Susceptance add up?

It simply adds up

28. What is the phase difference in a three-phase AC?

120 degrees

29. What is the characteristic of an oscillator?

It does not have a negative feedback

30. Time domain is commonly seen in an

Oscilloscope

31. What is the equivalence of Reactance Power?

Imaginary Power

32. What determines the efficiency of the generator?

Output power divided by the driving power

33. What is a device that produces an output for 10 input pulses?

Decade scaler

34. What is an advantage of CCO over VFO?

Low drift

35. What commonly uses IC?

Digital computer

36. Damping method used in a dynamometer?

Air Friction

37. What converts different networks in different Protocols?

Gateway

38. What happens when a Capacitance has a negative Temperature coefficient?

As temperature goes down, capacitance goes up

38. What is a device that checks the current without opening the circuit?

Clamp Probe

40. What do you need to cascade an NMOS to a CMOS?

Pull-up resistor

41. What happens if there is a reactance in the output of a transmission line?

Mismatch will happen

42. What protects the active component during turn-on?

Snubber Circuit

43. Commonly used Regulator in the industry?

78XX

44. Disadvantage of Transformer Coupling?

It costs too much

45. In a parallel-bulb circuit, when one bulb is shorted-out

you must always have a fuse or circuit breaker

46. What happens when the fuse that you replaced has a lower current rating than the previous fuse?

The fuse will blow right away

47. What does a beat frequency oscillator do?

Detects CW

48. What is true about an auto transformer?

It has only one-tap winding

49. Commonly used in Semiconductor aside from Aluminum?

Gallium Arsenide

50. Disadvantage of Gallium Arsenide?

Expensive to use

51. When a PN junction is forward-biased,

the anode is positive wrt cathode

52. What is the current carrying part in a FET?

Channel

53. What is easy to access but cannot be modified?

ROM

54. What device will require a large transformer?

TV station transmitter

55. What is the magnetic flux ratio of primary winding to secondary winding?

Coefficient of coupling

56. What is NO break power transfer?

The new generator is inserted while the old generator is still in line

57. What is break power transfer?

The generator is inserted when the old generator is removed

58. What is commonly used in hi-fi amplifier?

Class B

59. What does voltage-doubler power supply do?

Produces low current and high voltage output

60. Language higher than high-level language?

4GL(4^th generation language)

61. What is least susceptible to noise?

TTL(Transistor-transistor Logic)

62. What OP-AMP compares voltages?

Comparator

63. What controls the cut-off or pinch-off voltage?

Gate

64. What is a platter?

It is part of the hard disk

65. What should be considered in a transmission line?

Minimizing the loss

66. In p-type transistors,

electrons are minority carriers

67. What does a shell core do in a transformer?

Maximizes coupling

68. Why magnetron’s electron flow is spiral?

Due to its longitudinal magnetic wave

69. Technique used in minimizing ripple?

Regulation

70. Commonly used device in household appliance involving dc voltages?

Rectifier

71. In a P-channel JFET,

the gate is negative relative to the source

72. JFET’s characteristic curve involves

the drain voltage as a function of drain current

73. Given a frequency, what happens to the reactance when the frequency increases?

Gets more and more negative

74. Reactance in a transmission line is ________of the current in it

independent

75. Junction in a p-type transistor that negates the flow of capacitance?

Junction Capacitance

76. In a transformer, Maximum efficiency is achieved when

Constant loss=copper loss

77. In core-type transformers,

Shorter magnetic path is achieved

78. In-phase breakdown does not affect the

failure of an oscillator

79. What is needed to modify an amplifier to be used in hi-fi applications?

2 push-pull external transistors

80. Are ferromagnetic-core coil better than Air-core coil in transformers?

No!

81. Type of diode that is used for tuning receivers?

Varactor diode

82. In a_________, when the primary coils are energized the secondary coil should not be energized

current transformer

83. The effect of ________is to cause voltage drop in the windings

leakage flux

84. The advantage of full-wave rectifier is that

it operates in both cycles whereas half-wave rectifier operates in one of the cycles

85. If a power transformer is operated at very high frequencies,

core loss will be excessive

86. A device that has a magnet that is perpendicular to the direction of the flux?

Magnet-moving equipment

87. In a PNP-type transistor,

the collector is negative wrt the emitter

88. Disadvantage of CMOS?

Cannot withstand higher voltages

89. What does negative feedback do in an amplifier?

Reduces gain

90. ________is the difference between a value of an observation and the mean of the population in statistics

Deviation

91. Bipolar transistor?

Collector is negative relative to the emitter