This is the Section 1 Module 18 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 18
1. What describes Armstrong oscillator?
The signal is fed from output to the input through transformer
2. It is the motor or actuator current so that torque remains constant and load changes
Torque Control
3. The purpose of internal clamping diode on the input of the ringing logic probe:
To minimize the negative effects
4. At frequency of 400Hz, the most likely form of inductor is:
Toroidal
5. In digital AC, the output configuration used in “busing”:
Tri state buffer
6. Diode used in switching, negative resistance region
tunnel diode
7. Programming with continuous path control
walk through programming
8. Electronics technology which exploits the spin of electrons
spintronics
9. To cause a three-state buffer to output 0-1
signal OE to output 1
10. Clock periods are measured from:
similar points on clock waveform
11. Best type of filter of power supply:
capacitor in parallel and choke in series
12. Logic family w/c is most resistant noise than TTL:
DTL
13. The fastest unsaturated logic family:
HTL
14. In closed loop control system, the differences in measured value and set or desired value:
error
15. Typical output of silicon photovoltaic cell:
0.6
16. Generally, the deflection of an oscilloscope
electrostatic deflection
17. The dielectronic use in a oscilloscope is:
electrostatic deflection
18. Condition wherein the arithmetic computation is more than the capacity of output:
overflow
19. Condition wherein the arithmetic computation is more negative than the capacity of output:
underflow
20. The opposition to the creation of magnetic line of flux:
reluctance
21. Instrument in which operation depends on the reaction of magnetic flux:
induction instrument
22. Instrument in which operation depends on the opposition and repulsion of electrically charged objects:
electrostatic instrument
23. Instrument in which on moving iron vane…
permanent magnet moving coil
24. Instrument which depends on current at one or more fixed coils:
moving-magnet
25. MOSFET input impedance is:
extremely high
26. Which describes ferromagnetic material?
magnetic flux concentrates w/in the core
27. Ac bridge used in measuring inductance and Q of inductor
Hays bridge
28. Leakage flux in transformers cause:
voltage drop in windings
29. Maxwell bridge measures accurately the:
medium inductance
30. An input variable or parameter that varies by output control:
manipulated variable
31. A saturable reactor with regenerative feedback:
magnetic amplifier
32. In designing weak small signals, the most important to consider is:
noise figure
33. An instrument that is able to generate noise w/ accurate voltage for test purposes:
noise generator
34. Robot Arm classification (1) Cylindrical (2) Cartesian (3) Articulated (4) Spherical:
1, 2, 3, 4
35. A cycle of a degree phase:
1/360 of a cycle
36. Large transformer has efficiency of:
95%
37. It grasps, hold and deposit components, referred also as robot “hand”:
gripper
38. The most popular thyratron use in electrical power circuits:
SCR
39. In RF or microwave, an instrument that measures incidental and reflected light:
reflectometer
40. Fixed negative voltage regulator use in circuitry:
79XX series
41. Fixed positive voltage regulator use in circuitry:
78XX series
42. Disadvantage of mercury cell and battery:
it is destructive to environment
43. Also known as bang-bang control:
on-off
44. Current range used in arc welding process:
50 - 450 A
45. Transformer has zero efficiency when:
no load
46. What theorem is used on the computation of common voltage with resistances connected in parallel:
Millman’s Theorem
47. Open resistance, open voltage source
Thevenin’s Theorem
48. Op amp with regenerative feedback
servo system
49. Operating system used to connect in internet:
server
50. Most costly actuator:
hydraulic
51. Fast, long range, wireless used to connect household And businesses not reachable by cables:
WiMax
52. 4th economic key next to land, labor and capital:
information
53. Plot used to interpret steady-state sinusoidal response:
nyquist plot
54. Main program of an operating system:
kernel
55. IC that can be changed:
EPROM
56. Icon is determined by:
extension
57. Damping method used in induction type meters:
eddy current damping
58. Arrangement of electrons
electronic configuration
59. A reactive device used in electrical power with 2 coils connected in a common iron core:
saturable reactor
60. Step recovery diode is also called:
charge storage diode
61. Air as dielectric has an advantage of:
low loss
62. Effects on air gap in transformer core:
increase magnetizing current
63. Resistor arrangement used to control volume in stereo Compact disc:
audio taper potentiometer
64. Typical ripple rejection of 3 terminal voltage regulator:
0.1%
65. One coulomb of charge passing a point every second:
1A
66. At SCR firing angle, power transfer is
95%
67. Supersonic welding frequency range
10 – 75 kHz
68. Welding has ___ intervals:
5
69. At very low frequency, transformer poorly works because:
magnetizing current is high
70. Linear voltage regulator
the conductor … directly proportional w/ voltage or current
71. In a transformer, the amount copper in the primary:
almost the same as secondary
72. In transformer construction , the primary and secondary Coil must have:
tight magnetic coupling
73. Resistors connected in series, the value of total resistance
greater than the greatest resistors
74. Oscillator with tapped coil in a tuned circuit:
Hartley
75. CRAY 1 has ____ compound element in its processor
Gallium Arsenide
76. Which is the most common type of meter?
d’Arsonval
77. Who built the computer in 1946 which has binary codes and stores data:
John Von Neumann
78. Circuit that changes pure binary code into ASCII:
code converter
79. It has only two output voltage level:
digital electronics
80. In TTL circuits, it has more than one gate, how do you handle unused gates:
force the output to go high
81. The rapidly flashing logic probe tip tells that the logic node being probe:
has rapidly changing logic activity
82. The regulator with the highest efficiency used in high Current, high voltage applications:
switching regulator
83. In a transformer to have a maximum power transfer:
copper loss is equal to constant loss
84. In transformer, what parameters are equal in primary & secondary:
voltage per turn & ampere turn
85. Sampling circuit used in voltage regulator:
voltage divider circuit
86. Used to characterize differences in edge timing of multiclock input:
clock skew
87. Advantage of magnetic disk over magnetic tape:
faster storage & retrieval of data
88. What will happen to the eddy current when the load is varied:
nothing will happen
89. Transmission system for robot w/ constant gear ratio:
chain driver
90. A crowbar is used:
as over voltage protection
91. What has 4 valence electrons:
elemental semiconductor
92. The only type of cooling used in largest power dissipators:
water cooling
93. Special bridge used to measure small resistance ( less than .1 ):
Kelvin double bridge
94. It increase the measuring capability of an ac meter:
different number of turns of coil
95. In which of the ff uses NPN transistor:
all of the above (RF & IF amp)
96. When op amp is used as buffer ckt, the output of voltage:
Vo = Vin
97. Which describes a ferromagnetic material:
concentrates the magnetic flux w/in the core
98. The output pulses of logic pulser:
can be used to overdrive logic nodes high or low
99. In transformer….
it’s magnetizing current will be high
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