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EEE :: Transistor Audio Power Amplifiers

  1. The output stage of a multistage amplifier usually employs ___________

  2. A.

     Push-pull amplifier

    B.

     Preamplifier

    C.

     Class A power amplifier

    D.

     None of the above

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  3. ___________ coupling is generally employed in power amplifiers

  4. A.

     Transformer

    B.

     RC

    C.

     direct

    D.

     Impedance

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  5. The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor?

  6. A.

     20 W

    B.

     40 W

    C.

     10 W

    D.

     80 W

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  7. The maximum efficiency of resistance loaded class A power amplifier is

  8. A.

     5%

    B.

     50%

    C.

     30%

    D.

     25%

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  9. The disadvantage of impedance matching is that it ___________

  10. A.

     Gives distorted output

    B.

     Gives low power output

    C.

     Requires a transformer

    D.

     None of the above

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

  12. A.

     At cut off point

    B.

     At the middle

    C.

     At saturation point

    D.

     None of the above

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  13. The output transformer used in a power amplifier is a ___________ transformer

  14. A.

     1:1 ratio

    B.

     Step-up

    C.

     Step-down

    D.

     None of the above

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  15. Transformer coupling can be used in ___________ amplifiers

  16. A.

     Either power or voltage

    B.

     Only power

    C.

     Only voltage

    D.

     None of the above

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

  18. A.

     Dual

    B.

     Push-pull

    C.

     Symmetrical

    D.

     Differential

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  19. A class A power amplifier is sometimes called ___________ amplifier

  20. A.

     Symmetrical

    B.

     Single-ended

    C.

     Reciprocating

    D.

     Differential

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