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ECE :: Exam Questions Paper

  1. For the given phase lead network, the maximum possible phase lead is

  2. A.
    sin-1
    B.
    30°
    C.
    45°
    D.
    60°

  3. Given (224)r = The value of the radix 'r' is :

  4. A.
    5
    B.
    6
    C.
    7
    D.
    10

  5. Which factor determines whether the medium is free space, lossless dielectric, lossy dielectric or good conductor?

  6. A.
    Attenuation constant
    B.
    Constitutive parameters (σ, μ, ε)
    C.
    Loss tangent
    D.
    Reflection coefficient

  7. Find RAB

  8. A.
    2 Ω
    B.
    1.5 Ω
    C.
    3 Ω
    D.
    None of the above

  9. convert into spherical co-ordinates.

  10. A.
    A = 2 sinθ[sinθ tanΦa r + sinΦa θ + a Φ]
    B.
    A = 2 sinΦ[sinΦ tanΦa r + sinΦa θ + a Φ]
    C.
    A = 2 sinΦ[sinΦ tanΦa r - sinΦa θ - a Φ]
    D.
    none of these

  11. Consider the following program segment written for 8085 based system
    LXI SP, FFFFH
    MVI A, FFH
    MOV BB, A
    K: DCR B
    PUSH HL
    JNZ K
    INR A
    LXI H, FFCEH
    CPI 20H
    LHLD

    The contents of accumulator is :

  12. A.
    CE
    B.
    20
    C.
    indeterminate
    D.
    none of these

  13. The reduced form of the function
    Y(A, B, C, D, E, F) = ∑m(0, 1, 2, 3, 4, 6, 7, 8, 9, 12, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 28, 30, 31) is given by:

  14. A.
    A(C D + E F + D E) + D E
    B.
    (A + C + D + E)(D + E + F)
    C.
    (C + D + E + A)(A + D + E + F)
    D.
    A C D + A E F + A(D ⊕ E)

  15. A 1000 kHz carrier wave modulated 40% at 4000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulation after transmission through this circuit?

  16. A.
    0.40
    B.
    0.20
    C.
    0.27
    D.
    0.54

  17. For the circuit, let us assume that R = 1 Ω, L = 10-3 H, and V(t) = 10 cos (1000t + 30°)V and the differential equation for I(t) is given by

  18. A.
    7.07 cos (1000t + 15°) A
    B.
    70.7 cos (1000t - 30°) A
    C.
    7.07 cos (1000t - 15°) A
    D.
    7.07 cos (1000t + 15°) A

  19. Find equivalent capacitance if each capacitance is 1 F.

  20. A.
    56 F
    B.
    6/5 F
    C.
    6/10 F
    D.
    5/12 F