This is the Section 2 Module 8 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 2 Module 8
1. Oscillates – Gunn diode
2. Coherent radiation – laser diode
3. Input FET signal – small
4. Analysis of sinusoidal transistor – large or small signals analysis
5. Tapped coil – Hartley
6. “… opposing flux..” – Lenz law
7. Rapid switching of magnetic field, DC.. – Wiegand effect
8. Class A output – unclipped
9. Variable capacitor – varactor
10. Capacitance in a varactor is varied by – reverse voltage
11. Unimportant factor – current gain
12. 555 timer output – rectangular
13. Astable 555 timer, stable states = 0
14. Distorted slew rate of sine wave – triangular wave
15. Least distorted in digital signal- Bessel
16. N=10, flash over… - Elliptical
17. GBW- predistortion
18. Increase frequency in coil- increase positively
19. Increase frequency in capacitance – decrease negatively
20. High output, low input- full wave center tap
21. Geomagnetic field- slanted to rotational axis
22. Constant frequency in FET- stability
23. Negative gain, input to output - 180 degrees out of phase
24. Common emitter- 180 degrees out of phase
25. -15dB = input is stronger than output
26. WXYZ inputs, possible inputs: 16
27. X and Y are high, X NOT Y? low
28. Six binary digit, highest decimal? 63
29. Transmitter and receiver in a box – transceiver
30. Transresistance- output voltage to input current
31. Transconductance ,gm= 1000us-5000us
32. Magnetron, increase frequency – output decreases
33. FET input resistance- 1M to several megaohms
34. Klystron- highest achievable output
35. Q decrease in colpitts- output decrease
36. LF157A- BiFET
37. 741C- discrete resistors
38. Open loop, cut off frequency of 741C – compensating capacitor
39. To enhance stability, ground the- control grid
40. Five grids- heptode
41. Three grids- pentode
42. Power factor = true power over apparent power
43. Six second order approximation and one 1st order approximation order of the system – 13
44. Second order – 0 – 360 degrees
45. A/DA converter
46. AC collector = ac base times ac current gain
47. Unity closed loop voltage gain times cut-off frequency
48. lowest drop-off voltage – Germanium
49. graph from center – peak amplitude
50. if load resistance of oscillator is too high, what will happen – no worries, it can not go high
51. image frequency it too close to incoming signal
52. need most driving power – Class B
53. one fourth ISDD, pinch off voltage – one half
54. avalanche breakdown is applied in – voltage regulator
55. photodiode, not used as photovoltaic cell- reverse bias
56. all pass filter- delay equalizer
57. state variable filter – high pass, low pass, band pass
58. FET gate is equivalent to control grid of vacuum tube
59. Q at TSEB
60. VDB
61. Emitter resistance is____ than the load resistance – less
62. Audio amplifier- 20 Hz to 20 kHz
63. Platter can be found in- hard disk
64. Info is written in audio recording tape – diagonal edge of tape
65. Preceding voltage regulator – filter
66. Upper EMOSFET – two terminal
67. Represents 1 in positive logic = +4V
68. Represents 1 in negative logic = 0V
69. Single output, multiple input- Universal Logic Module
70. Frequency multiplication in diode because diode is- nonlinear
71. Property of diode that … frequency multiplication – nonlinear
72. One shot multivibrator increase- time capacitance increase
73. Resistor to diode in series- protection from surge currents
74. Tail current – two times either collector current
75. When Q is greater than one, bandpass filter is designed with – MFB stages
76. Upper and lower frequencies, voltage gain = 0.707 amid
77. Maximum peak to peak, Q should be at – ac center load line
78. Typical input of op-amp- differential input, differential output
79. Emitter follower distortion- very low
80. Inductive reactance is equal to resistance of RL circuits, phase difference is- 45 degrees
81. Characteristic impedance depends on- construction on transmission lines
82. To minimize interelectrode capacitance- keep wires short
83. Cold cathode- no filament
84. Cathode is heated directly- filament serves as cathode
85. Vacuum tube for high power RF amplifier
86. Capacitance…- signal frequency
87. FET preferred over BJT- radio receiver
88. Bandwidth of PLL- capture range
89. Thermal shutdown – internal temperature is too high
90. Impractical in silicon chip- inductors
91. When capacitive plate thickness increases,
Ans. Capacitive reactance decreases negatively
92. Distortion of emitter follower
Ans. Very low
93. Resistivity
Ans. Ohms per meter
94. Input produces the same output shape
Ans. It is linear
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