86. In a class A transformer-coupled power amplifier, ________ winding resistance of the transformer determine(s) the dc load line for the circuit.
(a) the ac
(b) the dc
(c) both the ac and dc
(d) neither the ac nor dc
87. In class B operation, the current drawn from a single power supply has the form of ________ rectified signal.
(a) a full-wave
(b) a half-wave
(c) both a full-wave and a half-wave
(d) None of the above
88. In a class A transformer-coupled amplifier, the ________ the value of VCEmax and the ________ the value of VCEmin, the ________ the efficiency to (from) the theoretical limit of 50%.
(a) larger, smaller, farther
(b) larger, smaller, closer
(c) smaller, larger, closer
(d) None of the above
89. A class A amplifier dissipates ________ power when the load is drawing maximum power from the circuit.
(a) the least
(b) about the same
(c) the most
(d) None of the above
90. The fundamental component is typically ________ any harmonic component.
(a) larger than
(b) the same as
(c) smaller than
(d) None of the above
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555555555576. 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- Amplifiers » Exercise - 110. The type of power amplifier which exhibits crossover distortion in its output is : (a) Class A (b) Class B (c) Class AB (d) Class C
- 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%