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ECE :: Analog Electronics

  1. The ripple factor of a half wave rectifier is more than 2.

  2. A.
    True
    B.
    False

  3. Assertion (A): The circuit in figure produces repetitive narrow pulses when input is fed with sine or triangular waveform having peak value more than + V

    Reason (R): The high gain op-amp produces voltages at two levels. If input is more than + V, the output is + 15 V otherwise the output is - 15 V.

  4. 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

  5. In a CE amplifier drives a low load resistance directly the result will be

  6. A.
    overloading of amplifier
    B.
    underloading of amplifier
    C.
    overloading or underloading of amplifier depending on circuit
    D.
    none of the above

  7. For CE amplifier of figure, the slope of ac load line is


  8. For high frequencies a capacitor like

  9. A.
    an open circuit
    B.
    a short circuit
    C.
    either open circuit or short circuit
    D.
    none of the above

  10. A non-inverting op-amp summer is shown in figure, the output voltage V0 is

  11. A.
    B.
    3 sin (100t)
    C.
    sin (100t)
    D.
    2 sin (100t)

  12. In following figure find VGG by assuming gate current is negligible for the p-channel JFET. (if IDQ = - 6 mA, RS = 0, VDD = -18 V, RD = 2 kΩ, IDSS = - 10 mA, IPO = - 3 V)

  13. A.
    0.67 V
    B.
    6.7 V
    C.
    7 V
    D.
    0.3 V

  14. A difference amplifier using op-amp has closed loop gain = 50. If input is 2 V to each of inverting and non-inverting terminals, output is 5 mA. Then CMRR =

  15. A.
    20000
    B.
    2000
    C.
    200
    D.
    20

  16. The coupling capacitor in amplifier circuits

  17. A.
    affects dc biasing
    B.
    does not affect dc biasing
    C.
    affects dc biasing to some extent
    D.
    both (a) and (c)

  18. In figure if C is replaced by short circuit then RB will be

  19. A.
    425 K
    B.
    412 K
    C.
    474 K
    D.
    400 K