31. You find that this amplifier only shows the negative alternation at the output. The possible trouble might be that ________.
(a) C3 is shorted.
(b) BE1 is open.
(c) BE2 is open.
(d) R1 is open.
32. A class C amplifier has a tank circuit in the output. The amplifier is conducting only 28°. The output voltage is ________.
(a) 0 V.
(b) a dc value equal to VCC.
(c) a sine wave.
(d) a square wave with a frequency determined by the tank.
33. You find that there is an input signal on the base of Q1 and Q2. However, there is no output signal. You then measure the dc voltages on Q2 and find them to be all 0 V. The possible trouble might be ________.
(a) C3 is shorted.
(b) C1 is open.
(c) RL is shorted.
(d) VCC is 0 V.
34. In practice, the efficiency of a capacitively coupled class A amplifier is about ________%.
(a) 25
(b) 34
(c) 70
(d) 10
35. The Q-point is at cutoff for class ________ operation.
(a) A
(b) B
(c) C
(d) AB
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