71. Which of the following describe(s) a power amplifier?
(a) It can handle large power.
(b) It can handle large current.
(c) It does not provide much voltage gain.
(d) All of the above
72. Categorize the power efficiency of each class of amplifier, from worst to best.
(a) A, B, AB, D
(b) A, AB, D, B
(c) A, AB, B, D
(d) Any of these
73. Class AB operation is ________ operation.
(a) similar to class A
(b) similar to class B
(c) similar to class C
(d) None of the above
74. Which of the power amplifiers has the lowest overall efficiency?
(a) Class A
(b) Class B or AB
(c) Class C
(d) Class D
75. What is the maximum efficiency of a class A circuit with a direct or series-fed load connection?
(a) 90%
(b) 78.5%
(c) 50%
(d) 25%
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- 555555555596. A form of class A amplifier having maximum efficiency of ________ uses a transformer to couple the output signal to the load. (a) 90% (b) 78.5% (c) 50% (d) 25%