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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. The impulse response h[n] of a linear time invariant system is given by h[n] = ∪[n + 3 ] + ∪[n - 2] -2∪[n -7]. The above system is

    2. A.
    stable but non-casual
    B.
    stable and casual
    C.
    casual but unstable
    D.
    unstable and not casual

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  2. Which one condition is true to check the periodically for discrete time signal (where K is any integer, N is period, f0 is frequency of signal)

    3. A.
    f0 = K/N
    B.
    f0 = K + N
    C.
    f0 = KN
    D.
    f0 = N/K

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  3. If v(t) = 0 for t < 0 and e-at for t ≥ 0 V(jω) = 1/(a + jω).

    4. A.
    True
    B.
    False

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  4. The term 'energy spectral density' is associated with

    5. A.
    periodic waveform
    B.
    non-periodic waveform
    C.
    both perodic and non -perodic waveform
    D.
    none of the above

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  5. If f(t) = 1, F(jω) = 2p δ(ω).

    6. A.
    True
    B.
    False

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  6. Short circuit is the dual of open circuit.

    7. A.
    True
    B.
    False

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  7. Highest value of Autocorrelation of a function 100 cos 50 pt is

    8. A.
    50
    B.
    100
    C.
    zero
    D.
    100/p

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  8. The Laplace transform of (tn-1) where n is integer is

    9. A.
    1/sn
    B.
    (n - 1)!/sn
    C.
    D.
    n!/sn

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  9. Which one of the following is the correct statement? The region of convergence of z transform of x[n] consists of the values of z for which x[n] r-n is

    10. A.
    absolutely integrable
    B.
    absolutely summable
    C.
    unity
    D.
    < 1

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  10. The data about p the pull required to lift a weight wby a pulley block is

    The linear law p = a + bw is

    11. A.
    3.2 + 0.171 w
    B.
    2.28 + 0.1879 w
    C.
    1.2 + 0.25 w
    D.
    0.6 + 0.3 w

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