Module 5.7

Power Amplifiers Quiz

Try our quiz, based on the information you can find in Amplifiers Module 5. Submit your answers and see how many you get right. If you get any answers wrong. Just follow the hints to find the right answer and learn about Amplifiers as you go.

1.

Refer to Fig. 5.7.1: What will be the operating mode of the amplifier?
 ampquiz05-571.gif

2.

Refer to Fig. 5.7.1: If the amplifier is delivering 5WRMS of audio power to the loudspeaker, what will be the approximate RMS voltage across the transformer primary?

3.

What is the main factor governing the maximum power rating (PTOT) of a transistor?

4.

For the class B power amplifier circuit in Fig. 5.7.2, which of the output waveforms a b c d shows the correct output signal? src="images/ampquiz05-572.gif" alt=" ampquiz05-572.gif "/>

5.

Which of the following amplifier classes has a maximum theoretical efficiency of between 70 and 80%?

6.

Which of the following classes of amplifier is illustrated by the input characteristic shown in Fig. 5.7.3
 ampquiz05-573.gif

7.

Refer to Fig. 5.7.4: What is the purpose of D1 and D2?
 ampquiz05-574.gif

8.

Refer to Fig. 5.7.4: What is the purpose of the capacitor C3?

9.

Which of the stages listed below would drive the loudspeaker, in a class D amplifier?

10.

Which of the following problems may be expected as a result of using pulse width modulation (PWM) in audio amplifiers.

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