26. The maximum efficiency of a class B amplifier is ________ percent.
(a) 50
(b) 25
(c) 70
(d) 79
27. The class ________ amplifier is biased below cutoff.
(a) A
(b) AB
(c) B
(d) C
28. A class ________ amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180º of the input cycle.
(a) A
(b) B
(c) C
(d) AB
29. Which class of amplifier operates in the linear region for only a small part of the input cycle?
(a) A
(b) B
(c) C
(d) AB
30. You find that there is no output signal. You measure the dc voltage of Q1 emitter and find it equal to 0 V. The trouble might be ________.
(a) D1 is shorted.
(b) D2 is shorted.
(c) R1 is open.
(d) no trouble, everything is normal.
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