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ECE :: Analog Electronics

  1. A CB amplifier has a = 0.98 and RL = 600 Ω. If IE = 3.5 mA, the current gain is

  2. A.
    1
    B.
    0.98
    C.
    0.98 x 3.5
    D.

  3. funity of an op-amp is about 1 kHz.

  4. A.
    True
    B.
    False

  5. Assertion (A): In an RC coupled amplifier the junction capacitances can be neglected at low frequencies but not at high frequencies

    Reason (R): Capacitive reactance is inversely proportional to frequency.

  6. 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

  7. In figure, D1 turns on when

  8. A.
    vi is more than V1
    B.
    vi is less than V1
    C.
    vi is between V1 and V2
    D.
    none of the above

  9. In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is

  10. A.
    30 V
    B.
    60 V
    C.
    15 V
    D.
    10 V

  11. In the circuit of figure both diodes are ideal. If v1 = 10 V and v2 = 10 V which diode will conduct?

  12. A.
    D1 only
    B.
    D2 only
    C.
    Both D1 and D2
    D.
    Neither D1 nor D2

  13. The output impedance of an ideal op-amp is

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

  15. In the circuit of the given figure, assume that the diodes are ideal and the meter is an average indicating ammeter, the ammeter will read

  16. A.
    0.42 A
    B.
    0.4 A
    C.
    D.
    0.4/p mA

  17. A virtual ground is a ground for

  18. A.
    voltage
    B.
    current
    C.
    both voltage and current
    D.
    voltage but not for current

  19. As compared to a full wave diode rectifier circuit using centre tapped transformer, the bridge diode rectifier circuit has the main advantage of

  20. A.
    higher current carrying capacity
    B.
    higher efficiency
    C.
    lower ripple factor
    D.
    lower PIV