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EEE :: Multistage Transistor Amplifiers

  1. 1 db corresponds to ___________ change in power level

  2. A.

     50%

    B.

     35%

    C.

     26%

    D.

     22%

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  3. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?

  4. A.

     8 db

    B.

     6 db

    C.

     5 db

    D.

     4 db

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  5. The final stage of a multistage amplifier uses ___________

  6. A.

     RC coupling

    B.

     Transformer coupling

    C.

     Direct coupling

    D.

     Impedance coupling

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  7. In obtaining the frequency response curve of an amplifier, the ___________

  8. A.

     Amplifier level output is kept constant

    B.

     Amplifier frequency is held constant

    C.

     Generator frequency is held constant

    D.

     Generator output level is held constant

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  9. If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is ___________

  10. A.

     600 db

    B.

     24 db

    C.

     14 db

    D.

     27 db

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  11. In RC coupling, the value of coupling capacitor is about ___________

  12. A.

     100 pF

    B.

     0.1 µF

    C.

     0.01 µF

    D.

     10 µF

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  13. The ear is not sensitive to ___________

  14. A.

     Frequency distortion

    B.

     Amplitude distortion

    C.

     Frequency as well as amplitude distortion

    D.

     None of the above

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  15. RC coupling is generally confined to low power applications because of

  16. A.

     Large value of coupling capacitor

    B.

     Low efficiency

    C.

     Large number of components

    D.

     None of the above

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  17. ___________ coupling provides the maximum voltage gain

  18. A.

     RC

    B.

     Transformer

    C.

     Direct

    D.

     Impedance

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  19. The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?

  20. A.

     5 mV

    B.

     2 mV

    C.

     8 mV

    D.

     5 mV

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