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ECE :: Signals and Systems

Signals and Systems - Section 1
Signals and Systems - Section 2
Signals and Systems - Section 3
Signals and Systems - Section 4
Signals and Systems - Section 5
Signals and Systems - Section 6
Signals and Systems - Section 7
Signals and Systems - Section 8
Signals and Systems - Section 9
Signals and Systems - Section 10
Signals and Systems - Section-11

  1. If f(t) is in volts, then F(jω) is in

    2. A.
    volts
    B.
    volt seconds
    C.
    volts/sec
    D.
    volt-sec2

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  2. Assertion (A): If , the final value of i(t) = 10

    Reason (R): If , the initial value i(t) = 2

    3. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

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  3. An ac circuit has an impedance of (3 + j6) ohm for fundamental. The impedance for fifth harmonic is

    4. A.
    (15 + j 30) Ω
    B.
    (15 + j 6) Ω
    C.
    (3 + j 30) Ω
    D.
    (3 + j 1.2) Ω

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  4. Which of following is recursive system?

    5. A.
    y(n - 1)
    B.
    y(n + 1)
    C.
    y(n)
    D.
    y(n) + y(n + 1)

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  5. In terms of signum function sgn(t), unit step function u(t) =

    6. A.
    1 + sgn(t)
    B.
    1 - sgn(t)
    C.
    0.5 + 0.5 sgn(t)
    D.
    0.5 - 0.5 sgn(t)

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  6. Choose correct option

    7. A.
    var (X + Y) = Var (X) + Var (Y)
    B.
    var (X - Y) = Var (X) + Var (Y)
    C.
    var (X + Y) = Var (X) x Var (Y)
    D.
    Both (a) and (b)

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  7. If sequence y(n) = x(-n) then it is

    8. A.
    Causal
    B.
    Non-Causal
    C.
    Depends on x(-n)
    D.
    None

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  8. In the given figure 15.6 shows a series, R - C circuit fed by a current source i(t). There is an initial voltage v0. across the capacitor. The system

    9. A.
    is linear
    B.
    is non linear
    C.
    may be linear or non linear
    D.
    is linear only if v0 is zero

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  9. The function δ(t - b) is

    10. A.
    an impulse function
    B.
    a step function originating at t = b
    C.
    an impulse function originating at t = b
    D.
    none of the above

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  10. An ac network has a power factor of 0.8 lagging for fundamental frequency. If the applied voltage contains thrid and fifth harmonics, the overall power factor will be

    11. A.
    more than 0.8 lagging
    B.
    0.8 lagging
    C.
    less than 0.8 lagging
    D.
    0.8 lagging or less

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