a. A.
c. C.
b. B.
d. AB.
7. When low-level modulation is used in a transmitter, the final power amplifier
is operated as a
b. class B amplifier.
d. push-pull amplifier.
8. The tuned tank circuit in a class C amplifier plate circuit is designed to
a. operate only in push-pull.
b. be shocked into oscillation.
c. provide a series-resonant circuit.
d. change the sinusoidal waveform into pulses of RF energy.
9. The essential difference between a class B and a class C radio-frequency
power amplifier in a CW transmitter is the
a. operating plate voltage.
b. value of bias voltage.
c. use of push-pull circuits for class B operation.
d. development of sinusoidal waveform in class C operation.
10. Neutralization is not required in a frequency multiplier circuit because
a. there is no grid tank circuit in a frequency multiplier.
b. there is no plate tank circuit in a frequency multiplier.
c. plate and grid tank circuits are tuned to the same frequency.
d. plate and grid tank circuits are tuned to different frequencies.
11. Assume that pentode tube, functioning as a class A amplifier, uses cathode
bias. This type of bias is developed by the cathode resistor and the
a. control grid current.
b. screen grid current.
c. cathode current.
d. plate current.
321 L1
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