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ECE :: Exam Questions Paper

  1. If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} = 1, then

  2. A.
    Y = Z
    B.
    Y = Z
    C.
    Z = 1
    D.
    Z = 0

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  3. (22)4 + (101)3 - (20)5 = (x)4 + (4)x+1 where x > 4. The value of x is

  4. A.
    6
    B.
    4
    C.
    12
    D.
    8

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  5. Consider a system with the transfer function . Its damping ratio will be 0.5 when the value of k is :

  6. A.
    2/6
    B.
    3
    C.
    1/6
    D.
    6

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  7. For the system with given characteristic equation
    s5 + 4s4 + 8s3 + 8s2 + 7s + 4 = 0
    The number of roots on left hand side, right hand side and imaginary axis are respectively.

  8. A.
    3, 2, 0
    B.
    4, 0, 1
    C.
    3, 0, 2
    D.
    4, 1, 0

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  9. A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is

  10. A.
    25
    B.
    50
    C.
    100
    D.
    200

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  11. The depth of penetration at 4 MHz is 10 cm, then at 2.5 MHz it is

  12. A.
    62.5 cm
    B.
    13 cm
    C.
    6.25 cm
    D.
    8 cm

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  13. The expression given is F(A, B , C, D, E, F, G, H) = (33, 48, 102, 158, 222, 229, 233, 243, 255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual

  14. A.
    243, 233, D
    B.
    222, 158, B
    C.
    243, 255, A
    D.
    229, 243, E

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  15. Calculate i(t) for t ≥ 0 assuming the switch has been in position A for a long time. At t = 0, the switch is moved to position B.

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  17. A source produces 4 symbols with probabilities , , , For this source, a practical coding scheme has an average codeword length of 2 bits/symbol. The efficiency of the code is

  18. A.
    1
    B.
    C.
    D.

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  19. A generator of 50 Ω internal impedance and operating at 1 GHz feeds a 75 Ω load via a coaxial line of characteristic impedance 50 Ω. The VSWR on the feed line is

  20. A.
    0.5
    B.
    1.5
    C.
    2.5
    D.
    1.75

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