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 – r__ectangular__

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**