81. Improvement in production techniques of power transistors have ________.
(a) produced higher power ratings in small-sized packaging cases
(b) increased the maximum transistor breakdown voltage
(c) provided faster-switching power transistors
(d) All of the above
82. In Fourier technique, any periodic distorted waveform can be represented by ________ the fundamental and all harmonic components.
(a) multiplying
(b) subtracting
(c) dividing
(d) adding
83. A ________ power amplifier is limited to use at one fixed frequency.
(a) class A
(b) class B or AB
(c) class C
(d) class D
84. The slope of the ac load line in the class A transformer-coupled transistor is ________.
(a) –1/RL (load resistor)
(b) 1/(a2RL)
(c) –1/(a2RL)
(d) 1/RL
85. The ________ has the hottest temperature in a power transistor.
(a) heat sink
(b) case
(c) junction
(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%