This is the Section 1 Module 13 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 13
1. High voltages are better than low voltages for long distance electric power transmission because
I2 R losses are lower
2. Opposes magnetic flux
Reluctance
3. A form of microwave electron tube is
Klystron
4. A transformer quadruples the AC voltage. The primary to secondary impedance ratio is therefore
1:16
5. A converter that converts AC
Cycloconverter
6. The input is low so the output is low
OR
7. Odd parity checker
XOR
8. Device used as comparator
Op-amp
9. Class A amplifier operates in
-360
10. In OR gate the output will be low if
All inputs are low
11. Signal plus noise to noise ratio is often specified when stating a receivers.
Sensitivity
12. Extent to which an oscillator maintains a constant frequency is called its
Stability
13. What law states the the ratio of the thermal conductivity to the electric conductivity is proportional to the absolute temperature of all metals.
Wiedemann-frenz law
14. Optoisolator
Led and a photodiode
15. Time required for a robot arm to move from one point to another
Cycle time
16. Highest input impedance
Common collector
17. The output electrode of BJT is usually
Collector
18. Unit for magnetic field
Maxwell
19. Used to measure a unknown inductance with capacitance standard
Maxwell oscillator
20. Technique in shared network the avoids missing printouts of several networks
Spooling
21. Which of the following devices has high input impedance. Bjt, diode,fet,mosfet?
MOSFET
22. What is the speed of motor with 6pole and 60cycles/second frequency
1200rpm
23. Maximum reverse voltage
Peak reverse voltage
24. Device that converts visible lights into DC is
Photovoltaic cell
25. An element of matter
Has a unique number of protons
26. Motor that has high torque
Series
27. Ammeter connect in a device need to be in
series
28. Internal resistance of ammeter
Zero
29. Need an internal power source
Ohmmeter
30. A +1 hole for proton and electron is
A charge of -1 unit
31. 1 coulomb equals
1A
32. 1/5 the range of wifi
Bluetooth
33. Frequency multiplication is possible with a semiconductor diode because the diode is
Non linear
34. In a power supply, resistor are sometimes connected in series with the diode in order to
Protect the diode against surge current
35. Magnetic lines of flux are generally
At right angle to the flow of current
36. Kind of oscilloscope that stores display for a long period
Storage oscilloscope
37. Frequency in Hertz
One divided by period of second
38. The oscillating frequency of a quartz crystal can be varied slightly by
Placing a small variable capacitor across the crystal
39. IC is usually made of
Monolithic
40. You have an unlimited supply of 1 watt, 1000 resistors and you need a 500 resistance rated at 7 W or more. This can be done by assembling
4 sets of 2 resistor in series and connecting these four sets parallel
41. To discharge filter capacitors after the supply is shut off
Bleeder resistor
42. Disadvantage of MOSFET
Easily damage by electrostatic discharge
43. A utility meter generally measures
Kilowatt hour
44. The schematic symbol for an op-amp
Triangle
45. Advantage of AC compare with DC as a source of utility power is that
it can be easily step up or step down in voltage
46. One way to keep interelectrode capacitance to minimum is to
Keep wire leads short
47. Where 1.2 henries of inductance can be used
Ferromagnetic pot core
48. The frequency oscillation of Wein Bridge Oscillator
½ pi RC
49. Number of Degree of freedom of manipulator adding a wrist
3
50. Robot arm
Manipulator
51. If two wave have the same frequency and the same amplitude but opposite phase the composite wave is
Zero amplitude because the two waves cancel each other
52. The inductance of a air core coil is affected by the following except
The frequency
53. Difference of magnetic disk to magnetic tape
Data in disk can be retrieve and stored faster than tape
54. To create an N type semiconductor
Add donor impurity
55. Size of proton compared to electron
1836 times
56. Printer and monitor is considered as
Output device
57. Image resolution is an important specification in
computer monitors
58. Most efficient voltage regulator
Switching regulator
59. Converts light to digital signal and gives feedback information in robotic system
Vision system
60. Welding process when the heat generated melt the tips of an electrode and the base metal
SMAW
61. Two AC bridge adjustment where the first adjustment changes affect the other adjustment ins special way, while changing the second adjustment does not affect the first one
Orthogonal nulling
62. Power supply filter gives the smallest ripple voltage
Multi LC filter
63. Simplest type of converter
Half wave converter
64. Other term for voltage amplifier
Pre-amplifier
65. Motor operating in heavy loads
Polyphase motor
66. Basic description of semiconductor
-variable conductive properties of some materials
67. Colpitts circuit is an
Oscillator
68. Motivating input signal in control system that not depends on the output signal
Command input
69. Signal in computer system which is the difference between feedback and reference signal
Actuating signal
70. Another term for memory
Primary storage
71. In a purely resistive impedance
Zero reactance
72. How electron flow in orbitals of an atom
Electron configuration
73. The net electric charge in an isolated system remains constant
Law of conservation of charge
74. In a step up power transformer
The secondary voltage is larger than the primary voltage
75. Center tap usually exist in
Balanced winding
76. High sensitivity VOM
Measure high resistance
77. Known as the envelope of work a robot.
Range of axis motion
78. When a several resistance are connected in series
the current is the same through each one
79. Selenium usually use in
Photocell
80. Not advantage of IC over discrete device
Low gain
81. The power density of IC provide
High speed
82. Filter that separates audio frequency signal on each other, one into the tweeter and the other to the woofer
Cross over network
83. A form of communication in which either party can instantly interrupt the other at any time is called
Full duplex
84. Use of lead acid cell
Use in interruptible power supply
85. For a given value of capacitance, as the frequency goes down, the reactance
Gets more and more negative
86. Advantage of laser printer over dot matrix printer
Superior image quality
87. High sensitivity substance usually use
Can be used as permanent magnet
88. Comparator with hysteresis
Schmitt triger
89. Synchronizing pulses in video signal
Keep the image from “tearing or rolling”
90. The following is needed for an AC generator to provide power except for
natural energy source
91. Advantage of Full wave over half wave rectifier
conduct signal all over the input and operates on the whole cycle
92. Advantage of parallel data transfer over serial transfer is
higher speed
93. Which comes first in the planar process of fabricating ICs?
Crystal growth
94. The force between a magnet and a piece of ferromagnetic metal that has not been magnetized
Never repulsive
95. EMF induced in inductor except
if the field core and coil is moving in same velocity
96. Advantage of rheostat against potentiometer
Rheostat can work at high current
97. Minimum number of diodes in a half wave rectifier
1
98. In a machine vision system enhance sensitivity often involves a sacrifice in the
image resolution
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