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ECE :: Analog Electronics

  1. Overall efficiency of class B amplifier is

  2. A.
    72%
    B.
    75%
    C.
    78.5%
    D.
    70%

  3. For a transistor to have-a larger β it must have and a

  4. A.
    close to zero
    B.
    close to 0.5
    C.
    close to unity
    D.
    nearly infinite

  5. JFET is also known as

  6. A.
    linear device
    B.
    square law device
    C.
    inverse law device
    D.
    logarithmic law device

  7. Drain feedback bias is often used with

  8. A.
    D MOSFETs
    B.
    E MOSFETs
    C.
    both D and E MOSFETs
    D.
    neither D nor E MOSFETs

  9. CMRR of a difference amplifier is equal to

  10. A.
    (Av')/(Acom)
    B.
    Av/Acom
    C.
    Acom/Av'
    D.
    (Av)/(Acom)2

  11. In a class C amplifier, full cycle conductor of the current is achieved by employing

  12. A.
    tuned circuit
    B.
    transformers
    C.
    complementary pair
    D.
    Push pull configuration

  13. Higher order active filters are used for variable

  14. A.
    bandwidth
    B.
    gain in the pass band
    C.
    impedance
    D.
    roll off rate

  15. Which of the following statement is false?

  16. A.
    The gate of DMOSFET may be biased positively, zero or negatively
    B.
    N-channel enhancement-only MOSFET conducts only when its gate is highly positive
    C.
    JFET has lower input impedance than MOSFET
    D.
    The bipolar base is forward biased, JFET gate must also be forward biased

  17. Assertion (A): The main use of Miller integrator is to generate ramp

    Reason (R): An inverting amplifier can handle more than one input at the same time.

  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

  19. In figure, IC

  20. A.
    I1
    B.
    IB
    C.
    0.5 I1
    D.
    0.5 IB