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EEE :: Transistor Audio Power Amplifiers

  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


  3. The push-pull circuit must use ___________ operation

  4. A.

     Class A

    B.

     Class C

    C.

     Class B

    D.

     Class AB


  5. The most costly coupling is ___________ coupling

  6. A.

     RC

    B.

     Direct

    C.

     Impedance

    D.

     Transformer


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

  8. A.

     10%

    B.

     0%

    C.

     25%

    D.

     50%


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

  10. A.

     5 W

    B.

     33 W

    C.

     75 W

    D.

     1 W


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

  12. A.

     50%

    B.

     90%

    C.

     5%

    D.

     5%


  13. Class C power amplifier has the highest collector efficiency

  14. A.

     C

    B.

     A

    C.

     B

    D.

     AB


  15. Class ___________ operation gives the maximum distortion

  16. A.

     A

    B.

     B

    C.

     C

    D.

     AB


  17. An AF amplifier is shielded to ___________

  18. A.

     Keep the amplifier cool

    B.

     Protect from rusting

    C.

     Prevent induction due to stray magnetic fields

    D.

     None of the above


  19. 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 ?

  20. A.

     10 W

    B.

     15 W

    C.

     5 W

    D.

     20 W