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ECE :: Analog Electronics

  1. Which of the following circuit does not need a coupling capacitor?

  2. A.
    Resistance loaded
    B.
    Transformer coupled
    C.
    Impedance coupled
    D.
    Single tuned

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  3. Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation is in parameters of active device and other components.

    Reason (R): A large negative feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to feedback factor.

  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

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  5. In case of a transistor amplifier the emitter resistance Re is removed

  6. A.
    the gain of the amplifier will reduce
    B.
    heat sink will not be required
    C.
    Q-point will become unstable
    D.
    base to emitter function will be less forward biased

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  7. In oscillators class C operation is preferred because

  8. A.
    is most efficient
    B.
    has frequency stability
    C.
    gives larger output
    D.
    it produces nearly square waves

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  9. In a common emitter circuit all voltages are measured with respect to

  10. A.
    base
    B.
    emitter
    C.
    collector
    D.
    base or collector

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  11. A ripple in collector supply voltage of the output stage of amplifier causes noise.

  12. A.
    True
    B.
    False

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  13. In a transistor IE = 10 mA, ICO = 0.5 μA and a = 0.995. Then ICEO =

  14. A.
    100 μA
    B.
    25 μA
    C.
    10.1 mA
    D.
    10.5 mA

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  15. As a compared to a CB amplifier, a CE amplifier has

  16. A.
    lower current amplification
    B.
    higher current amplification
    C.
    lower input resistance
    D.
    higher input resistance

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  17. The stray capacitance between the last stage and the first stage of an oscillator may cause

  18. A.
    unwanted low frequency oscillations
    B.
    unwanted high frequency oscillations
    C.
    unwanted oscillations at low and high frequencies
    D.
    large feedback

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  19. In a voltage regulator circuit using zener diode the load voltage is nearly constant only if

  20. A.
    zener current is very small
    B.
    zener current is very large
    C.
    zener current is neither small nor large
    D.
    None of the above

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