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ECE :: Analog Electronics

  1. Which of the following power amplifiers has highest efficiency?

  2. A.
    Class A
    B.
    Class AB
    C.
    Class B
    D.
    Class C

  3. A full wave rectifier using centre tapped transformer and a bridge rectifier use similar diodes and have equal no load output voltage. Under equal load conditions

  4. A.
    Output voltage of bridge rectifier
    B.
    Output voltage of bridge rectifier will be more than that of other
    C.
    Output voltage of both will be exactly equal
    D.
    Output voltage of any one may be more than that of other

  5. Assume that op-amp in figure is ideal. If input Vi is triangular, the output V0 will be

  6. A.
    square wave
    B.
    sine wave
    C.
    triangular wave
    D.
    parabolic wave

  7. In an amplifier with a gain of - 1000 and feedback factor β = - 0.1, the change in gain is 20% due to temperature. The change in gain for feedback amplifier will be

  8. A.
    10%
    B.
    5%
    C.
    0.2%
    D.
    0.01%

  9. In the diode circuit of figure the diodes are ideal. The average current through ammeter is


  10. A transistor has two p-n junctions. The batteries should be connected such that

  11. A.
    both junctions are forward biased
    B.
    both junctions are reverse biased
    C.
    one junction is forward biased and the other is reverse biased
    D.
    either (a) or (b)

  12. The value of parameter re used in re transistor model

  13. A.
    increases with increase in temperature
    B.
    decreases with increase in temperature
    C.
    is not affected by increase in temperature
    D.
    either (b) or (c)

  14. Assertion (A): In a full wave rectifier output the lowest ac component is at twice the input frequency

    Reason (R): In a full wave rectifier, the output waveform consists of half sinusoids

  15. 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

  16. An op-amp has zero gain for common mode inputs. Then CMRR =

  17. A.
    zero
    B.
    infinite
    C.
    high
    D.
    low

  18. Assertion (A): Negative feedback reduces the bandwidth of an amplifier

    Reason (R): Negative feedback stabilizes the gain of an amplifier

  19. 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