This is the Section 1 Module 10 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 10
1. The constant current region of a FET lies between:
- pinch-off & breakdown
2. Ideally, the equivalent circuit of a FET contains:
- current source bet drain & source terminals
3. Where would you most likely find a lead-acid battery:
- in a portable video cam/recorder
4. Lantern application
- two way portable radio
5. Three phase ac:
- has three waves, all of same amplitude
6. The gate-source diode of a JFET is:
- reversed bias
7. A triangular wave:
- has equal rise & decay rates
8. Inductors in series, assuming no mutual inductance, combine:
- like resistors in series
9. An air variable capacitor might have a range of:
1pf - 100pf
10. Example of elemental semiconductor
- Germanium
11. Electroluminescent of green & red light
- Gallium Phosphide
12. If in the case of certain dc armature, the number of commutator segments is found either one less or than the number of slots, the armature must be having a simplex ____ winding
- wave
13. Lap winding is suitable for ___ current, ___ voltage dc generators:
- high,low
14. The series field of a short shunt dc generator is excited by ___ currents:
- load
15. In a dc generator, the generated emf is directly proportional to the:
- pole flux
16. The commercial efficiency of a shunt generator is maximum when its variable loss equals ___ loss:
- constant
17. Critical resistance of the dc generator is the resistance of:
- field
18. At a frequency of 400 Hz, the most likely form of an inductor would be:
- toroidal
19. At a frequency of 95 MHz, best form of an Inductor would be:
- air core
20. The current sensitivity of a meter is expressed in:
- ohm/volt
21. A 0-1 mA meter has a sensitivity of:
1k ohm/V
22. The power rating of transistor can be increased by:
- using a heat sink
23. The ac load line is the same as dc load line when the ac collector resistance equals the:
- dc collector resistance
24. A sine wave:
- always have the same general appearance
25. A derivative of a sine wave:
- representation of rate of change
26. Advantage of CMOS:
- low power consumption
27. Advantage of electromagnet over permanent magnet
- electromagnet can be switched on or off
28. Crystal set:
- requires no battery
29. Miller
- Voltage gain
30. A polarized capacitor:
- electrolytic
31. The feedback element of a differentiator:
- resistor
32. Semiconductor use in xerography:
- Selenium
33. The dry cell usually:
1.5V
34. Geomagnetic lines of flux:
- are horizontal at the geomagnetic equator
35. The geomagnetic field:
- is what makes a compass work
36. Magnetic flux of around straight, current carrying wire:
- strongest near the wire
37. An ac electromagnet:
- will attract pure, unmagnetized iron
38. Substance with high retentivity is best suited for making:
- a permanent magnet
39. Latch is always:
- positive feedback
40. Zero level detector:
- comparator
41. The speed of universal motor:
- dependent on frequency of supply
42. NICAD memory:
- does not occur very often
43. Resistance of semiconductor:
- bulk resistance
44. Difference of “lantern” and “transistor”
- lantern has more energy capacity
45. The lowest frequency passed by low pass filter
- 0 Hz
46. Base current of phototransistor:
- directly proportional to light
47. The frequency of an amplifier has a gain of 1:
- unity-gain frequency
48. Special type of diode capable of amplification & oscillation:
- Tunnel diode
49. Used in microwave
- IMPATT diode
50. Diode operates in negative resistance in quantum mechanical…
- Gunn Diode
51. Special type of tunnel diode.
- Backward Diode
52. … RF oscillations
- Gunn effect
53. PN junction with intrinsic carrier:
- PIN diode
54. Cascaded transistor has an advantage of:
- low input capacitance
55. Which of the following are thyristors:
- diac & triacs
56. Admittance:
- can ease to pass ac
57. Compensating windings
- reduce armature reaction
58. Device which is used in remote location
- relay
59. It is switch on only when current passes, relay is said to be:
- normally open
60. Base voltage of TSEB should be very:
- small
61. In TSEB, base voltage is:
- near zero volts
62. Minimum anode current keeping the SCR on
- Holding current
63. Minimum current to turn on the SCR
- Trigger Current
64. Voltage above which SCR enters conduction region
- forward breakover voltage
65. In op amp, single ended mode:
- both inputs are connected
66. In dc generator, it is take advantage but unwanted:
- hysteresis motor
67. Variable capacitor diode
- Capacitance increases with increase reverse bias voltage
68. When the emitter bypass capacitor is open, the ac input voltage:
- remains the same
69. When the emitter bypass capacitor is open, the ac output voltage:
- decreases
70. When emitter resistance increase, the collector voltage:
- increases
71. The square wave out of emitter follower:
- both peaks are clipped
72. Clipper when the diode is connected in series with load:
- series clipper
73. Instrumentation amplifier:
- high noise environment
74. The efficiency of a tiny motor in a wrist watch:
1%
75. The current going into a point in a dc circuit is always equal to the current:
- flowing out of that point
76. The sum of the voltages, going around a dc circuit, but not including the power supply:
- equal value as, but opposite polarity, power supply
77. When the positive lead is connected to the anode & the negative lead is connected to the cathode:
- forward biased
78. Maximally flat discharge curve:
- Butterworth
79. Sine wave:
- at just one frequency
80. Positive ion forms when:
- valence electron breaks away
81. The cathode of zener diode must be:
- more positive than the anode
82. Shaded pole:
- high starting torque
83. Solder shorts:
- equal to the collector voltage supply
84. To biased an NPN transistor, the base must be:
- positive with respect to emitter
85. In a voltage divider, when one resistor is open:
- transistor is driven to saturation
86. Darlington advantage:
- very high current gain
87. The starting torque of capacitor-start-induction-run motor is related to the angle between two windings current:
- sine alpha
88. At cutoff, what is the condition of JFET channel:
- almost closed
89. Ohms Law:
- ohms is equal to volts divided ampere
90. Maximum efficiency of class B push pull amplifier:
78.5%
91. Maximum efficiency of class B push pull amplifier:
79 %
92. Push pull amplifier is used in:
- class B
93. Construction of class B push pull amp
- complementary symmetry transistor
94. Operates in linear region at all times
- class A
95. Class C is usually found in:
- tuned RF circuit
96. Negative feedback:
- increases the input impedance & bandwidth
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