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