51. In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?
A. Thin base
B. Thin collector
C. Wide emitter
D. None of the above
✅ The correct answer is option A.
Electrical Engineering
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52. A pony motor is used for the starting which of the following motors ?
A. Squirel cage induction motor
B. Schrage motor
C. Synchronous motor
D. None of the above
✅ The correct answer is option C.
53. With forward bias to a pn junction , the width of depletion layer__________________?
A. Decreases
B. Increases
C. Remains the same
D. None of the above
✅ The correct answer is option A.
54. Due to which of the following reasons the cables should not be operated too hot ?
A. The oil may loose its viscosity and it may start drawing off from higher levels
B. Expansion of the oil may cause the sheath to burst
C. Unequal expansion may create voids in the insulation which will lead to ionization
D. The thermal instability may rise due to the rapid increase of dielectric losses with temperature
✅ The correct answer is option E.
55. In a semiconductor, current conduction is due to________________?
A. Only holes
B. Only free electrons
C. Holes and free electrons
D. None of the above
✅ The correct answer is option C.
56. The parallel combination of a 470 Ω resistor and a 1.2 kΩ resistor is in series with the parallel combination of three 3 kΩ resistors. A 200 V source is connected across the circuit. The resistor with the most current has a value of____________?
A. 470 Ω or 1.2 kΩ
B. 3 kΩ
C. 470 Ω
D. 1.2 kΩ
✅ The correct answer is option C.
57. Class C amplifiers are used as ___________________?
A. AF amplifiers
B. Detectors
A. amplifiers
C. None of the above
✅ The correct answer is option A.
58. The voltage of a single solar cells is about
A. 0.5 volt
B. 1 volt
C. 1.8 volt
D. 1. 5 volt
✅ The correct answer is option A.
59. The disadvantage of impedance matching is that it _______________?
A. Gives distorted output
B. Gives low power output
C. Requires a transformer
D. None of the above
✅ The correct answer is option A.
60. In a p-channel JFET, the charge carriers are _____________?
A. electrons
B. holes
C. both electrons and holes
D. none of the above
✅ The correct answer is option B.