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Quiz: Signals & Systems Set-1

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Number of Questions: 40

Question: 6 -

A system is said to be shift invariant only if______

Options:

  1. a shift in the input signal does not exhibit the corresponding shift in the output

  2. a shifting level does not vary in an input as well as output

  3. a shift in the input signal also results in the corresponding shift in the output

  4. a shifting at input does not affect the output

    5. Answer:

    a shift in the input signal also results in the corresponding shift in the output
    Solution not available.

Question: 7 -

Which condition determines the causality of the LTI system in terms of its impulse response?

Options:

  1. Only if the value of an impulse response is infinity for all negative values of time

  2. Only if the value of an impulse response is unity for all negative values of time

  3. Only if the value of an impulse response is negative for all negative values of time

  4. Only if the value of an impulse response is zero for all negative values of time

    5. Answer:

    Only if the value of an impulse response is zero for all negative values of time
    Solution not available.

Question: 8 -

Which among the following are the stable discrete time systems?

1. y(n) = x(4n)
2. y(n) = x(-n)
3. y(n) = ax(n) + 8
4. y(n) = cos x(n)

Options:

  1. 1, 2, 3 & 4

  2. 1 & 3

  3. 1, 3 & 4

  4. 2 & 4

    5. Answer:

    1, 2, 3 & 4
    Solution not available.

Question: 9 -

An equalizer used to compensate the distortion in the communication system by faithful recovery of an original signal is nothing but an illustration of _________

Options:

  1. Invertible system

  2. None of the above

  3. Dynamic system

  4. Static system

    5. Answer:

    Invertible system
    Solution not available.

Question: 10 -

Under which conditions does an initially relaxed system become unstable?

Options:

  1. only if unbounded input generates unbounded output

  2. only if unbounded input generates bounded output

  3. only if bounded input generates bounded output

  4. only if bounded input generates unbounded output

    5. Answer:

    only if bounded input generates unbounded output
    Solution not available.