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
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