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ECE :: Exam Questions Paper

  1. Find the power absorbed or delivered by each source:

  2. A.
    a = -32 b = - 12 c = -80 d = -60
    B.
    a = -32 b = - 12 c = 80 d = 60
    C.
    a = 32 b = 12 c = -80 d = 60
    D.
    a = -32 b = 12 c = 80 d = -60

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  3. The function shown in figure, can represent a probability density function for A __________

  4. A.
    A = 1/4
    B.
    A = 1/6
    C.
    A = 1/9
    D.
    A = 1/2

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  5. If the transfer function of the following network is

    The value of the load resistance RL is

  6. A.
    R/4
    B.
    R/2
    C.
    R
    D.
    2R

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  7. A bipolar differential amplifier uses a transistor having β0 = 200, ICQ = 100 mA, |Adm| = 500 and CMRR = 80 dB. The value of Rc and RE will be respectively __________ .

  8. A.
    1.25 kΩ, 1.25 MΩ
    B.
    125 kΩ, 1.25 MΩ
    C.
    1.25 MΩ, 1.25 kΩ
    D.
    3.25 kΩ, 3.25 MΩ

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  9. System is at rest for t < 0. Vs = sin 2t. Determine v(t) for t greater than zero.

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  11. A 300 MHz plane EM wave is propagating in free space. The wave is incident normally on an infinite copper slap. The antenuation constant for the wave is (σcopper = 5.8 x 107 mho/ m). The skin depth is

  12. A.
    0.005 x 10-3 m
    B.
    0.0038 x 10-3m
    C.
    0.0028 x 10-3 m
    D.
    0.0024 x 10-3 m

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  13. Following figure represents

  14. A.
    AND
    B.
    OR
    C.
    NAND
    D.
    NOT

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  15. For parallel RLC circuit, which one of the following statements is NOT correct?

  16. A.
    The bandwidth of the circuit deceases if R is increased
    B.
    The bandwidth of the circuit remains same if L is increased
    C.
    At resonance, input impedance is a real quantity
    D.
    At resonance, the magnitude of input impedance attains its minimum value

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  17. The practical resonant circuit is shown in above figure. Find the expression for the resonant frequency ωo

  18. A.
    B.
    C.
    D.
    None of these

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