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ECE :: Exam Questions Paper

  1. The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

  2. A.
    9.19 A
    B.
    9.91 A
    C.
    10.56 A
    D.
    8.61 A

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  3. A noiseless 3 KHz channel can transmit binary at the rate __________ .

  4. A.
    12000 bps
    B.
    10000 bps
    C.
    6000 bps
    D.
    3000 bps

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  5. Find Vx Vy Vz

  6. A.
    Vx = -6 Vy = 3 Vz = -3
    B.
    Vx = -6 Vy = -3 Vz = 1
    C.
    Vx = 6 Vy = 3 Vz = 3
    D.
    Vx = 6 Vy = 1 Vz = 3

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  7. If x[n] then the sequence x[n] is

  8. A.
    non-periodic
    B.
    periodic
    C.
    depends on n
    D.
    none of these

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  9. Consider a stable and causal system with impulse response h(t) and system function H(S). Suppose H(S) is rational, contains a pole at S = - 2, and does not have a zero at the origin. The location of all other poles and zero is unknown for each of the following statements. Let us determine whether statement is true or false.

    1. f[h(t) e-3t] converges
    2. h(t) has finite duration
    3. H(s) = H(- s)
    Choose correct option.

  10. A.
    1 - True, 2 - False, 3 - True, 4 - False
    B.
    1 - False, 2 - False, 3 - False, 4 - True
    C.
    1 - False, 2 - False, 3 - False, 4 - False
    D.
    1 - True, 2 - can't say, 3 - True, 4 - can't say

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  11. The specific gravity of tungsten is 13.8 and its atomic weight is 184.0 Assume that there are two free elements per atom. Then the Fermi level or characteristic energy for the crystal in eV will be

  12. A.
    8.95 eV
    B.
    -8.95 eV
    C.
    7.326 eV
    D.
    -7.326 eV

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  13. An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE10 mode is

  14. A.
    1.5 x 108 m/s
    B.
    5.5 x 108 m/s
    C.
    3.46 x 108 m/s
    D.
    0.18 x 107 m/s

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  15. For a given voltage, four heating coils will produce maximum heat when connected

  16. A.
    all in parallel
    B.
    all in series
    C.
    with two parallel pairs in series
    D.
    one pair in parallel with the other two in series

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  17. Denominator polynomial of a transfer function of certain network is:
    s3 + s2 + 2s + 24
    Then the network is:

  18. A.
    stable
    B.
    oscillatory
    C.
    unstable
    D.
    depends on numerator polynomial

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  19. A TV picture is to be transmitted over a channel of 6 MHz bandwidth at a 35 dB S/N ratio. The capacity of the channel is

  20. A.
    50 Mbps
    B.
    100 Mbps
    C.
    36 Mbps
    D.
    72 Mbps

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