76. By how much does the output signal vary for a class AB power amplifier?
(a) 360º
(b) 180º
(c) Between 180º and 360º
(d) Less than 180º
77. Which of the following is (are) power amplifiers?
(a) Class A
(b) Class B or AB
(c) Class C or D
(d) All of the above
78. Which type of amplifier uses pulse (digital) signals in its operation?
(a) Class A
(b) Class B or AB
(c) Class C
(d) Class D
79. Which type of power amplifier is biased for operation at less than 180³ of the cycle?
(a) Class A
(b) Class B or AB
(c) Class C
(d) Class D
80. The greater the power handled by the power transistor, ________ the case temperature.
(a) the higher
(b) the lower
(c) there is no change in
(d) None of the above
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- 555555555566. How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal? (a) 0 (b) 1 (c) 2 (d) 3
- 5555555555 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%
- 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%