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ECE :: Exam Questions Paper

  1. The voltage reflection coefficient on a 50 Ω line is 0.7∠30°.
    The load impedance is


  2. For finding the square root of N using Newton's iterative formula, the correct expression is:


  3. For a random variable x following the probability density function, p(x), shown in figure, the mean and the variance are respectively,

  4. A.
    1/2 and 2/3
    B.
    1 and 4/3
    C.
    1 and 2/3
    D.
    2 and 4/3

  5. VR at t < T, t = ∞

  6. A.
    500e-40x104t, 0
    B.
    100e-40x103t, 0
    C.
    100e-40x106t, 0
    D.
    100e-40x104t, 0

  7. For a lossless transmission line, the propagation constant is given as γ = __________ .

  8. A.
    jω LC
    B.
    C.
    jω
    D.
    jω

  9. Consider the pulse shape s(t) as shown. The impulse response h(t) of the filter matched to this pulse is


  10. If each stage has a gain of 10 dB and noise figure of 10 dB, then the overall noise figure of a two stage cascade amplifier will be

  11. A.
    10
    B.
    1.09
    C.
    1.0
    D.
    10.9

  12. A rectangular waveguide of internal dimensions (a = 4 cm and b = 3) is to be operated in TE11 mode. The minimum operating frequency is

  13. A.
    6.25 GHz
    B.
    6.0 GHz
    C.
    5.0 GHz
    D.
    3.75 GHz

  14. Using 4-bit numbers (n = 4) if k = 00112, how is k expressed in 2's complement?

  15. A.
    10112
    B.
    11012
    C.
    11002
    D.
    01012