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ECE :: Analog Electronics

  1. A dc power supply has no load voltage of 30 V and full load voltage of 25 V at full load current of 1 A. The output resistance and voltage regulation respectively are

  2. A.
    5 Ω and 25%
    B.
    25 Ω and 20%
    C.
    5 Ω and 16.7%
    D.
    25 Ω and 16.7%

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  3. The main advantage of CC amplifier is

  4. A.
    High input impedance and low output impedance
    B.
    Low input impedance and high output impedance
    C.
    High voltage gain
    D.
    High current gain

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  5. If a = 0.995, IE = 10 mA, ICO = 0.5 mA, then ICEO will be

  6. A.
    100 μA
    B.
    25 μA
    C.
    10.1 μA
    D.
    10.5 μA

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  7. Assertion (A): In class C amplifier the efficiency is more than that for other classes of amplifiers

    Reason (R): In class C amplifier we can get high efficiency over a wideband

  8. 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

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  9. In the following figure C = 0.02 μF, and Vth is known to be of frequency ω = 107 rad/sec and rd = 2.5 Ω and ZTh = RTh = 10 Ω Then phase angle between id and Vd

  10. A.
    26.5°
    B.
    25°
    C.
    30°
    D.

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  11. A class C amplifier has input frequency of 200 kHz. If width of collector pulses is 0.1 μs, duty cycle is

  12. A.
    1%
    B.
    2%
    C.
    10%
    D.
    20%

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  13. Output of a phase splitter is

  14. A.
    a pair of sine waves of unequal amplitude
    B.
    a pair of sine waves of equal amplitudes
    C.
    a pair of sine waves of equal amplitudes and opposite phase
    D.
    a pair of sine waves of unequal amplitudes and opposite phase

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  15. In a transistor the minimum and maximum values of βdc are 100 and 121. The proper value of βdc to be used to locate Q point is

  16. A.
    100
    B.
    121
    C.
    110.5
    D.
    110

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  17. The input to an op-amp integrating amplifier is a constant voltage. The output will be

  18. A.
    a constant voltage
    B.
    a sawtooth wave
    C.
    a ramp
    D.
    ac voltage

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  19. FET amplifier is more difficult to analyse than BJT amplifier.

  20. A.
    True
    B.
    False

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