Signals And Systems Quiz -1 2018-19

20 Questions | Total Attempts: 84

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Signals And Systems Quiz -1 2018-19

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Questions and Answers
  • 1. 
    The type of systems which are characterized by input and the output quantized at certain levels are called as
    • A. 

      Analog

    • B. 

      Discrete

    • C. 

      Continuous

    • D. 

      Digital

  • 2. 
    The type of systems which are characterized by input and the output capable of taking any value in a particular set of values are called as
    • A. 

      Analog

    • B. 

      Discrete

    • C. 

      Digital

    • D. 

       continuous

  • 3. 
    An example of a discrete set of information/system is
    • A. 

      The trajectory of the Sun

    • B. 

      Data on a CD

    • C. 

      Universe time scale

    • D. 

       movement of water through a pipe

  • 4. 
    A system which is linear is said to obey the rules of
    • A. 

      Scaling

    • B. 

      Additivity

    • C. 

      Both scaling and additivity

    • D. 

      Homogeneity

  • 5. 
     A time invariant system is a system whose output
    • A. 

      Increases with a delay in input

    • B. 

      Decreases with a delay in input

    • C. 

      Remains same with a delay in input

    • D. 

      Vanishes with a delay in input

  • 6. 
    Should real time instruments like oscilloscopes be time invariant?
    • A. 

      Yes

    • B. 

      Sometimes

    • C. 

      Never

    • D. 

      They have no relation with time variance

  • 7. 
     All real time systems concerned with the concept of causality are
    • A. 

      Non causal

    • B. 

      Causal

    • C. 

      Neither causal nor non causal

    • D. 

      Memoryless

  • 8. 
    A system is said to be defined as non causal, when
    • A. 

      The output at the present depends on the input at an earlier time

    • B. 

       the output at the present does not depend on the factor of time at all

    • C. 

      The output at the present depends on the input at the current time

    • D. 

      The output at the present depends on the input at a time instant in the future

  • 9. 
    When we take up design of systems, ideally how do we define the stability of a system?
    • A. 

      A system is stable, if a bounded input gives a bounded output, for some values of the input

    • B. 

      A system is unstable, if a bounded input gives a bounded output, for all values of the input

    • C. 

      A system is stable, if a bounded input gives a bounded output, for all values of the input

    • D. 

       A system is unstable, if a bounded input gives a bounded output, for some values of the input

  • 10. 
    All causal systems must have the component of
    • A. 

      Memory

    • B. 

      Time invariance

    • C. 

      Stability

    • D. 

      Linearity

  • 11. 
     Which mathematical notation specifies the condition of periodicity for a continuous time signal?
    • A. 

      X(t) = x(t +T0)

    • B. 

      X(n) = x(n+ N)

    • C. 

      X(t) = e-αt

    • D. 

      None of the above

  • 12. 
    Which property of delta function indicates the equality between the area under the product of function with shifted impulse and the value of function located at unit impulse instant?
    • A. 

      Replication

    • B. 

      Sampling

    • C. 

      Scaling

    • D. 

      Product

  • 13. 
    Which among the below specified conditions/cases of discrete time in terms of real constant ‘a’, represents the double-sided decaying exponential signal?
    • A. 

      A > 1

    • B. 

      0 < a < 1

    • C. 

      A < -1

    • D. 

      -1 < a < 0

  • 14. 
    Damped sinusoids are 
    • A. 

      Sinusoid signals multiplied by growing exponentials

    • B. 

      Sinusoid signals divided by growing exponentials

    • C. 

      Sinusoid signals multiplied by decaying exponentials

    • D. 

      Sinusoid signals divided by decaying exponentials

  • 15. 
    Under which conditions does an initially relaxed system become unstable?
    • A. 

      Only if bounded input generates unbounded output

    • B. 

       only if bounded input generates bounded output

    • C. 

      Only if unbounded input generates unbounded output

    • D. 

      Only if unbounded input generates bounded output

  • 16. 
    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)
    • A. 

      1 & 3

    • B. 

      2 & 4

    • C. 

      1,3& 4

    • D. 

      1,2,3,& 4

  • 17. 
    An equalizer used to compensate the distortion in the communication system by faithful recovery of an original signal is nothing but an illustration of 
    • A. 

      Static system

    • B. 

      Dynamic system

    • C. 

      Invertible system

    • D. 

      None of the above

  • 18. 
    Which block of the discrete time systems requires memory in order to store the previous input?
    • A. 

      Adder

    • B. 

      Signal Multiplier

    • C. 

      Unit delay

    • D. 

      Unit advance

  • 19. 
    What does the term y(-1) indicate especially in an equation that represents the behaviour of the causal system?
    • A. 

      Initial condition of the system

    • B. 

      Negative initial condition of the system

    • C. 

      Negative feedback condition of the system

    • D. 

      Response of the system to its initial input

  • 20. 
    Which type of system response to its input represents the zero value of its initial condition?
    • A. 

      Zero state response

    • B. 

      Zero input response

    • C. 

      Total response

    • D. 

      Natural response

  • 21. 
    Which among the following operations is/are not involved /associated with the computation process of linear convolution?
    • A. 

      Folding Operation

    • B. 

      Shifting Operation

    • C. 

      Multiplication Operation

    • D. 

      Integration Operation

  • 22. 
     A LTI system is said to be initially relaxed system only if 
    • A. 

      Zero input produces zero output

    • B. 

      Zero input produces non-zero output

    • C. 

       Zero input produces an output equal to unity

    • D. 

      None of the above

  • 23. 
    What are the number of samples present in an impulse response called as?
    • A. 

      String

    • B. 

      Array

    • C. 

      Length

    • D. 

      Element

  • 24. 
    A signal is a power signal when the signal has
    • A. 

      Infinite average power

    • B. 

      Finite average power

    • C. 

      Zero average power

    • D. 

      None of the above

  • 25. 
    The function which relates output of a system to the input(signal) of a system is
    • A. 

      Periodic function

    • B. 

      Non -periodic function

    • C. 

      Transfer function

    • D. 

      None of the above

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