This is the Section 1 Module 2 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 2
1. Which is not needed external power or power supply?
- All generally needed (Filter (active), Voltage regulator, Transformer)
2. Pot core
- large inductance in small volume
3. Toroidal core coil
- essentially self shielding
4. Hunting
- less in steam turbine
5. Purpose of damper winding
- to prevent hunting
6. Needed when generator is used with variable
- CSD (constant speed time) speed prime mover (e.g. aircraft engine)
7. 360°
- Class A
8. 180° / a transistor class amplifier that has the efficiency of 50%
- Class B
9. Efficiency of Class C transistorized
- 33%
10. Amplifier configuration with one at positive alternation and another at negative, looking a lot like complementary configuration
- Quasi Complementary push-pull configuration
11. Same as #10, with “is then coupled to transformer”
- Transformer coupled push-pull configuration
12. Needs to be taken externally to be erased
- EPROM
13. If X is low, output of X AND Y equals
- Low
14. Has the highest efficiency
- Common emitter, common source
15. Screen grid
- Decreases plate to grid capacitance
16. If center conductor of coaxial cable is made to small diameter, all other is equal. What will happen to Zo
- It will increase
17. 0° point
- From zero going up
18. Positive triggering
- Pulse level is low to high
19. Requirement of oscillator
- Stage with gain
20. Oscillation requires:
- Positive feedback enough to overcome losses
21. Not necessary consideration
- Nature of source of energy
22. Connected in parallel to filter
- Bleeder resistor
23. In between positive and negative battery plates
- Separator
24. In oscilloscope where signal is fed:
- Vertical deflection plate / coil
25. Spectrum analyzer displays:
- Signal strength vs frequency
26. Horizontal calibration of oscilloscope display
- Time per unit division
27. Zener diode:
- Connected in parallel, reversed biased
28. Cluster is
- data in hard drive
29. Platter is
- part of hard drive
30. Needed for selection of multiple signals
- multiplexer
31. Most common semiconductor material
- silicon
32. R=0, S=0, RS flip flop response
- stay the same as before
33. Approximate noise gain of an inverting adder if it has 5 inputs
- 6
34. Compares voltages in a certain range not just w/ respect to reference
- window comparator
35. Derivative of sinusoid
- leads 90°
36. Output of rectifier
- pulsating dc
37. 175 dc connected to mains electricity
- pulsating dc
38. Capacitor is NTC
- if high capacitance in low temperature
39. Electricity due to heat, as in thermocouple
- thermoelectricity
40. Combination of N and P type technology
- CMOS
41. CMOS
- damaged by static
42. Principal disadvantage of MOS
- Easily damaged by static electricity
43. If susceptance is doubled
- frequency doubles
44. LAN that stores own data in each pc
- peer to peer LAN
45. If X is increased, all things constant
- phasor gets longer, rotates ccw
46. If inductive reactance and resistance is continually increased but at constant 3:1 ratio
- phasor is infinitely long line
47. Brief rise spike in voltage
- transient
48. If no signal input, Ic is greatest
- if E-B is Forward biased
49. Most stable for RF
- common base
50. Two transistor directly coupled as common collector
- darlington
51. Uses crystalline/ceramic substance to convert ultrasound to electrical energy
- piezoelectric transducer
52. For high density OP AMP integrated circuits
- SMT
53. If IC is used, for packing density
- high switching speed
54. Designation of Dual in Line package (DIP)
- TO-116
55. Ratio of differential gain and common mode gain
- CMRR
56. Minimized through the use of small feedback resistance
- input bias current
57. Maximum rate at which w/c amp output can change
- Slew rate
58. 58.Significant if OP AMP is used as comparator
- Open loop gain
59. Cannot be charged
- primary cell
60. In pulse amplification, class D is mostly used. What is the efficiency of class D
- over 90% efficiency
61. FET will not conduct
- pinch off
62. JFET sometimes at pinch off
- if used at power amps
63. FALSE in ac:
- electrons flow in one direction
64. Electrode is carbon and zinc, also called dry cell
- leclanche cell
65. Electrode is nickel hydroxide and cadmium
- Edison cell
66. If source to gate is conducting
- a sign of improper bias
67. Silver cadmium cell, has a nominal open circuit
- 1.05V(e-review) voltage of 1.1V(book)
68. Step up transformer:
- primary voltage is less than secondary voltage
69. In Cathode Ray Tube (CRT), electrostatic deflection means
- the beam is bent by electric field
70. In FET, when biased at or beyond pinch off is
- power amplifier
71. How to minimize the effect of input offset current
- by having the feed and input offset voltage in output offset voltage resistance small
72. What is the voltage regulation when full load voltage
- 0% is the same as no load voltage, assuming perfect voltage source
73. Maximum current a cell can deliver in 0.01 ohm when testing
- flash current
74. In alternators connected in parallel, to change the frequency
- by changing the rpm of of the system the prime mover
75. In alternators connected in parallel, to change the
- by changing the voltage of the system field excitation
76. Transconductance
- the ratio of drain current and Gate voltage
77. Difference between triode and N-channel JFET
- triode needs more voltage
78. In vector diagram, the angle between 2 vectors is:
- phase difference
79. In class A amplifier, the Q point is set at:
- the center
80. An instrument used for a voltage w/ frequency
- frequency converter change to another voltage w/ another frequency
81. Non linear distortion in frequency
- harmonic distortion
82. A tube w/ constant voltage in changing current
- gas-filled regulator
83. Disadvantage of voltage multiplier
- poor regulation
84. Capacitance in reverse biased semiconductor
- width of depletion depends on:
85. Mutual inductance causes net values of set of coils to
- vary extent and phase of mutual
86. Parameter that helps to find Rf/Ri
- CMRR
87. Field poles in shunt fields
- always even number (exist in pair)
88. Although the op amp output should be zero volts,
- output offset voltage in actual operation there is
89. Eccles/Jordan flipflop is also known as
- bistable multivibrator
90. Multi cavity klystron has
- variable electron speed
91. The voltage gain of the basic instrumentation amplifier is set by
- a single internal resistor
92. Used in analog multiplication and division
- logarithmic amplifiers
93. A comparator switches to one state when the input reaches the
- upper trigger point
94. A mathematical process of determining the area under a curve
- integration
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