78. In a transistor, the base current is about of emitter current.
A.25%
B.20%
C.35%
D.5%

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79. At the base-emitter junction of a transistor, one finds
A. reverse bias
B. a wide depletion layer
C. low resistance
D. none of the above

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80. The input impedance of a transistor is
A. high
B. low
C. very high
D. almost zero

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81. Most of the majority carriers from the emitter
A. recombine in the base
B. recombine in the emitter
C. pass through the base region to the collector
D. none of the above

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82. The current IB is
A. electron current
B. hole current
C. donor ion current
D. acceptor ion current

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83. In a transistor,
A. lc = IE + IB
B. IB = lc + IE
C. IE = IC ? IB
D. IE = lc + IB

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84. The value of a of a transistor is
A. more than 1
B. less than 1
C.1
D.I3 IB

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