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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%


  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


  5. The final stage of a multistage amplifier uses ___________

  6. A.

     RC coupling

    B.

     Transformer coupling

    C.

     Direct coupling

    D.

     Impedance coupling


  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


  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


  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


  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


  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


  17. ___________ coupling provides the maximum voltage gain

  18. A.

     RC

    B.

     Transformer

    C.

     Direct

    D.

     Impedance


  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