第十二章测试1.
A class B amplifier (not push-pull) （ ）.
A:conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias B:conducts through 360° of the input waveform C:conducts through 180° of the input waveform D:conducts through less than 180° of the input waveform
答案:C
2.
Crossover distortion in class B amplifiers is prevented by （ ）.
A:using complementary-symmetry transistors B:biasing the transistors deeply into cutoff C:increasing the load resistance D:biasing the transistors slightly above cutoff 3.
The maximum theoretical efficiency of an RC-coupled class A amplifier is （ ）.
A:78.5% B:50% C:99% D:25% 4.
Power amplifiers are typically used to drive low impedance loads.（ ）
A:错 B:对 5.
The power that an amplifier delivers to a load is equal to the difference between the power that the circuit draws from the power supply and the power that the circuit dissipates.（ ）
A:错 B:对
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