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Transistor Audio Power Amplifiers - section-1
  1. If a transistor is operated in such a way that output current flows for 60° of the input signal, then it is ___________ operation

    2. A.

     Class A
    B.

     Class B
    C.

     Class C
    D.

     None of the above

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  2. The push-pull circuit must use ___________ operation

    3. A.

     Class A
    B.

     Class C
    C.

     Class B
    D.

     Class AB

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  3. The most costly coupling is ___________ coupling

    4. A.

     RC
    B.

     Direct
    C.

     Impedance
    D.

     Transformer

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  4. When no signal is applied, the approximate collector efficiency of class A power amplifier is

    5. A.

     10%
    B.

     0%
    C.

     25%
    D.

     50%

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

    6. A.

     5 W
    B.

     33 W
    C.

     75 W
    D.

     1 W

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  6. The maximum collector efficiency of class B operation is ___________

    7. A.

     50%
    B.

     90%
    C.

     5%
    D.

     5%

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  7. Class C power amplifier has the highest collector efficiency

    8. A.

     C
    B.

     A
    C.

     B
    D.

     AB

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  8. Class ___________ operation gives the maximum distortion

    9. A.

     A
    B.

     B
    C.

     C
    D.

     AB

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  9. An AF amplifier is shielded to ___________

    10. A.

     Keep the amplifier cool
    B.

     Protect from rusting
    C.

     Prevent induction due to stray magnetic fields
    D.

     None of the above

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  10. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?

    11. A.

     10 W
    B.

     15 W
    C.

     5 W
    D.

     20 W

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