61. What is the maximum efficiency of a class B circuit?
(a) 90%
(b) 78.5%
(c) 50%
(d) 25%
62. The maximum efficiency of a transformer-coupled class A amplifier is ________.
(a) 25%
(b) 50%
(c) 78.5%
(d) 63.6%
63. Calculate the efficiency of a transformer-coupled class A amplifier for a supply of 15 V and an output of V(p) = 10 V.
(a) 25%
(b) 33.3%
(c) 50%
(d) 78.5%
64. In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor?
(a) 0.5
(b) 0.636
(c) 0.707
(d) 1
65. Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16 Ω.
(a) 78.54%
(b) 75%
(c) 70.69%
(d) 50%
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