Electronics Engineering Review Materials: Section 1 Module 12

This is the Section 1 Module 12 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 1 Module 12

This is the Section 1 Module 12 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 12

1. A tube core is…

Bulky and heavy

2. If two signals with the same amplitude cancels at the output…

They are out-of-phase by 180°

3. If R = XL in a circuit, phase angle would be…

45°

4. If R = XC in a circuit, phase angle would be…

-45°

5. What is the fourth harmonic of 8 kHz?

3.2 Mhz

6. Which of the following is polarized capacitor?

Electrolytic

7. The input of FET has…

High input impedance

8. F = X(Y+Z), if Y=1 and X=0…

F is always 0

9. Which of the following configuration has an 180° out-of-phase output?

Common source

10. Which of the following is false?

Characteristic impedance is complex quantity

11. If the speed of data transfer increases…

Bandwidth increases

12. If line frequency increases…

Xc decreases negatively

13. If line frequency increases…

XL increases positively

14. If the number of turns increases…

Current decreases close to zero

15. The increase in turns has what effect to line current…

It decreases current

16. Operating on high values of voltage has a disadvantage on…

Dynamic range

17. The collector of a PNP transistor is…

Negative with respect to emitter

18. The brain of computer…

CPU

19. The heart of computer…

Microprocessor

20. When using a ham radio, which is consider illegal?

Selling of used cars

21. Advantage of a dot-matrix printer

Low operating cost

22. A meter sensitivity control in a test instrument would probably be:

Linear-taper potentiometer

23. The limit for the size of an IC

Size of an atom

24. The limit for the size of an Is (erroneous)

Size of an atom

25. Which of the following is not needed for a rectifier circuit

Uninterruptable power supply

26. RF choke…

Will pass dc but not RF

27. Preferred core for a value of 1.5 H

Pot core

28. An advantage of a toroid coil over solenoid core is:

The toroid confines magnetic flux

29. These are charge carriers which move from atom to atom

Free electron

30. LAN in which each user’s computer stores its own data is called …

Peer-to-peer LAN

31. The square root of an imaginary number…

Can never be zero

32. The horizontal value from an spectrum analyzer:

Frequency

33. With a reversed-bias condition…

PN junction does not operate

34. A BJT is a…

Three-layer semiconductor

35. A dB value is a measure of…

Relative signal strength

36. Power factor is the ratio of…

True power over VA

37. Peak values are always

Greater than or equal to average values

38. An advantage of a magnetic disk over magnetic tape for data storage is that

Data storage and retrieval is faster on disk

39. As capacitor plate area increases, all other things being equal:

The capacitance increases

40. A complex number:

Has a real part and an imaginary part

41. A vector pointing southeast in the GB plane would indicate the following

Conductance and inductive capacitance

42. Which of the following is not an example of true power?

Power in a capacitor

43. In a step up transformer:

Primary voltage is less than the secondary voltage

44. Eddy current cause:

An increase in copper loss

45. In a household circuit, the 234V power has:

3-phase

46. A transmission line carries 3.5 A of ac current and 150 Vac. The true power in the line is:

Meaningless; true power is dissipated not transmitted

47. GaAs is:

A compound

48. Of the following appliances, which one will you cannot find an IC

TV broadcast transmitter

49. In a pnp circuit, the collector:

Is negative with respect to emitter

50. In many cases, a PNP transistor can be replaced with an NPN device and the circuit will do the same thing provided that:

The supply polarity is reversed

51. When a transistor is conducting as much as it possible can, it is said to be:

In saturation

52. In an N-channel JFET, pinch-off occurs when the gate is:

Very negative

53. Which of the following circuits has its output 180° out of phase with its input

Common source

54. A broadband PA is:

Generally easy to use

55. A tuned PA must always be:

Adjusted for maximum power output

56. A loading control in a tuned PA:

Provides an impedance match between the bipolar transistor or FET and load

57. In a ROM…

It’s easy to get data out, but hard to put it in

58. A kilobyte is

About 1000 bytes

59. In magnetic audio tape…

The tracks are parallel to the edges

60. In magnetic video tape…

The video tracks are diagonal

61. An advantage of magnetic disks over magnetic tape is:

Disk allow faster data storage and retrieval

62. CDs are not generally used for recording:

Via magnetic field

63. A vidicon camera is tube is noted for

Sensitivity

64. Data sent along a single line, one bit after another is called

Serial

65. An advantage of JK over an RS flip flop is that

The JK always has predictable output

66. When the bias in an FET stops the flow of current, the condition is called

Pinch-off

67. The extent to which an oscillator maintains a constant frequency is called its:

Stability

68. In a PNP bipolar transistor:

The collector is negative with relative to the emitter

69. Noise in a wireless receiver can be minimized by:

Reducing the temperature to very low values

70. As the data speed increases in a wireless system, all other factors being equal…

The signal bandwidth increases

71. The term shortwave, in reference to radio, refers to signals having wavelengths approximately equal:

10 to 100 meters

72. The use of direction-finding equipment to determine the latitude and longitude of a transmitter is an example of…

Radiolocation

73. An example of a mass-storage device is:

Hard drive

74. Which of the following types of mass storage provides the fastest access time?

Flash memory

75. A thermal printer might be the best type of printer for…

Someone who travels a lot

76. High voltage are better than low voltages for long distance electric power transmission because:

The I2R losses are lower

77. An advantage of a laser printer over a dot-matrix printer for computer applications is:

Lower cost

78. If general, as the noise level in a wireless system increases:

Stronger incoming signals are needed to overcome it

79. Why complex numbers are used to represent impedance?

It can describe what is really happening in the circuit

It can describe what is really happening in the circuit

80. Phase of a signal is measured starting from…

Zero positive going

81. If you change dielectric of a capacitor

not enough data

82. R = 300 ohms, C = -30 ohms, what will be the phase angle

Current leads voltage by a few degrees

83. Which of the following configuration is the input is taken at the collector

None of the above

84. Which of the following configuration input and output is in phase

More than two of the above

85. Heaviside oscillator- mutual inductance

86. A camera used in imaging positron emitter using multiple layers of silicon detector

Compton camera

87. Ability of a material to produce lines of flux..

Magnetism

88. Ability of a voltage regulator to produce constant DC output regardless of the variations on the output of the rectifier

Line regulation

89. Beta in the bipolar transistor

Current Amplification Factor

90. The output of a common base is taken from the

Collector

91. An autotransformer has how many winding

1

92. Which process is used in cold welding?

Pressure

93. Noise blanker improves the quality of

Radio reception

94. Electromagnetic signal is considered “shortwave” if the free space wavelength is

55 meter

95. A colpitts oscillator which uses a small capacitance to reduce the effect of stray capacitance

Clapp oscillator

96. An operational amplifier has the following application

Compactor and video signal detector, AC and DC amplifier, oscillator and signal conditioning

97. Infrared and optical wireless works best on

Line of sight

98. A MODEM has

An A/D converter

99. An AC signal is applied to a diode, if the peak AC voltage does not reach avalanche, which of the following is true?

None of the choices is correct

100.An electron gun in CRT is also called

Cathode

101. A 40 + j30 means

A resistance of 40 and an inductive reactance of 30

Section 1 Modules: Reviewers in Electronic Engineering


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