EC8452-EC-II::Quiz-5-Power Amps.& DC Converters

The output stage of a multistage amplifier is also called ……………

• Mixer stage

• Power stage

• Detector stage

• None of the above

………………. coupling is generally employed in power amplifiers

• Transformer

• RC

• direct

• Impedance

A class A power amplifier uses …………

• Two transistors

• Three transistors

• One transistor

• None of the above

The maximum efficiency of transformer coupled class A power amplifier is ………………

• 30%

• 50%

• 80%

• 45%

Class……. power amplifier has the highest collector efficiency

• C

• A

• B

• AB

Power amplifiers handle …………. signals compare to voltage amplifiers

• Small

• Very small

• Large

• None of the above

In class A operation, the operating point is generally located ………. of the d.c. load line.

• At cut off point

• At the middle

• At saturation point

• None of the above

A 2-transistor class B power amplifier is commonly called ……….. amplifier

• Dual

• Push-pull

• Symmetrical

• Differential

If a transistor is operated in such a way that output current flows for 60^o of the input signal, then it is …………… operation

• Class A

• Class B

• Class C

• None of the above

If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ……………….

• 5 W

• 33 W

• 75 W

• 1 W