Electronics Engineering Review Materials: Section 2 Module 8

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(Last Updated On: December 8, 2017)

Electronics Review Materials: Section 2 Module 8

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

Complete List of Section 2 Modules in Electronics (Q&A)

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