MCQs on Power Amplifiers

For class B operation, the collector current flows for

• The whole cycle

• Half the cycle

• Less than half a cycle

• Less than a quarter of a cycle

Transformer coupling is an example of

• Direct coupling

• AC coupling

• DC coupling

• Impedance coupling

An audio amplifier operates in the frequency range of

• 0 to 20 Hz

• 20 Hz to 2 kHz

• 20 to 20 kHz

• Above 20 kHz

A tuned RF amplifier is

• Narrowband

• Wideband

• Direct-coupled

• A dc amplifier

The first stage of a preamp is

• A tuned RF stage

• Large signal

• Small signal

• A dc amplifier

For maximum peak-to-peak output voltage, the Q point should be

• Near saturation

• Near cutoff

• At the center of the ac load line

• At the center of the dc load line

Push-pull is almost always used with

• Class A

• Class B

• Class C

• All of the above

One advantage of a class B push-pull amplifier is

• No quiescent current drain

• Maximum efficiency of 78.5 percent

• Greater efficiency than class A

• All of the above

Class C amplifiers are almost always

• Transformer-coupled between stages

• Operated at audio frequencies

• Tuned RF amplifiers

• Wideband

The collector current of a class C amplifier

• Is an amplified version of the input voltage

• Has harmonics

• Is negatively clamped

• Flows for half a cycle