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ECE :: Analog Electronics

  1. In figure, current gain is

  2. A.
    a
    B.
    re
    C.
    D.

  3. In the CE circuit shown in figure the slope of dc load line will be


  4. Which of the following values represents the open loop gain of typical op-amp?

  5. A.
    100
    B.
    10000
    C.
    100000
    D.
    1000000

  6. Which of the following configuration has low thermal stability?

  7. A.
    CB
    B.
    CC
    C.
    CE
    D.
    All have identical thermal stability

  8. Efficiency of class A power amplifier is very poor.

  9. A.
    True
    B.
    False

  10. In an op-amp comparator, the positive or negative output is

  11. A.
    saturated
    B.
    amplifier
    C.
    unsaturated
    D.
    any of the above

  12. In logarithmic amplifiers, output voltage is equal to

  13. A.
    K.log10 (input voltage)
    B.
    K.loge (input voltage)
    C.
    input voltage
    D.

  14. In a series regulated power supply circuit the voltage gain of pass transistor satisfies the condition

  15. A.
    Av → ∞
    B.
    1 << Av → ∞
    C.
    Av ≈ 1
    D.
    Av << 1

  16. Occasionally a discrete amplifier user RF chokes instead of collector resistors. Such amplifiers are inherently

  17. A.
    low pass amplifiers
    B.
    high pass amplifiers
    C.
    band pass amplifiers
    D.
    none of the above

  18. In oscillator circuits the energy feedback to its input terminal from output is

  19. A.
    always in phase with the input signal
    B.
    90° out of phase with the input signal
    C.
    180° out of phase with the input signal
    D.
    270° out of phase with the input signal