Home / ECE / Analog Electronics :: Section 9

ECE :: Analog Electronics

  1. Assertion (A): The duty cycle of a class C amplifier affects the power dissipation of transistor

    Reason (R): At higher harmonics the efficiency of a class C amplifier becomes poor

  2. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. If the op-amp in figure has a unity gain frequency of 1 MHz, the cut off frequency is

  4. A.
    100 kHz
    B.
    1 MHz
    C.
    10 MHz
    D.
    90 MHz

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. In a self bias circuit for CE amplifier the collector supply voltage is made twice. The collector current will

  6. A.
    decrease
    B.
    increase
    C.
    remain the same
    D.
    increase or decrease

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. In a full wave voltage doubler circuit, the input frequency is 560 Hz. The ripple frequency is

  8. A.
    25 Hz
    B.
    50 Hz
    C.
    100 Hz
    D.
    200 Hz

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. Assertion (A): A tuned amplifier uses a parallel tuned circuit

    Reason (R): A tuned amplifier is used to amplify a narrowband frequencies

  10. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. The ac collector current is nearly equal to

  12. A.
    ac base current
    B.
    ac signal current
    C.
    ac supply current
    D.
    ac emitter current

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. From a measurement of the rise time of the output pulse of an amplifier whose input is a small amplitude square wave, one can estimate the following parameter of the amplifier

  14. A.
    gain bandwidth product
    B.
    slew rate
    C.
    upper 3 dB frequency
    D.
    lower 3 dB frequency

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. In an amplifier, if the output current flows for 120° of the input cycle, the class of amplifier will be

  16. A.
    A
    B.
    B
    C.
    C
    D.
    AB

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. Assertion (A): If we overdrive an amplifier the output signal may get clipped

    Reason (R): To dissipate heat to atmosphere a heat sink is sometimes attached to the case of transistor

  18. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Which op-amp circuit uses a diode as one of the circuit components?

  20. A.
    Integrating amplifier
    B.
    Differentiating amplifier
    C.
    Logarithmic amplifier
    D.
    Summing amplifier

    View Answer

    Workspace

    Discuss Discuss in Forum