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Quiz: Signals and Systems Set-3

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Number of Questions: 25

Question: 16 -

An ac sinusoidal wave has an rms value of 10 V. The peak to peak value is

Options:

  1. 0 V

  2. 10 V

  3. 14.14 V

  4. 28.28 V

    5. Answer:

    28.28 V
    Solution:

    Peak to peak value = 2√2 (rms value).

Question: 17 -

The z transform of sequence x[n] = {2, 4, 3, 2}

Options:

  1. 2z-1 + 3 + 4z+1 + + 2z+2

  2. 2z+1 + 3z-1 + 4z-2 + 2z-3

  3. 3 + 2z-1 + 4z-2 + 2z-1

  4. 2z-1 + 4z-2 + 3 + 2z+1

    5. Answer:

    3 + 2z-1 + 4z-2 + 2z-1
    Solution:

    n(z) = 2z+2 + 4z+1 + 3 + 2z-1 or 2z-1 + 3 + 4z+1 + 2z+2

Question: 18 -

Which one is time invariant system?

Options:

  1. y[n] = x[n] x[n - 1]

  2. all

  3. y[n] = x[2n]

  4. y[n] = x[n/2]

    5. Answer:

    y[n] = x[n] x[n - 1]
    Solution not available.

Question: 19 -

F.T. of continuous non-periodic signal is

Options:

  1. aperiodic & periodic

  2. none

  3. aperiodic

  4. periodic

    5. Answer:

    aperiodic
    Solution not available.

Question: 20 -

The trignometric Fourier series of an even function of time does not have

Options:

  1. odd harmonic terms

  2. sine term

  3. cosine term

  4. dc term

    5. Answer:

    sine term
    Solution:

    An even function cannot have sine terms because for an even function f( - x) = f(x).