# Signals And Systems Quiz -1 2018-19

44 Questions | Total Attempts: 110  Settings Create your own Quiz .

• 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.

• 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.

• B.

Signal Multiplier

• C.

Unit delay

• D.

• 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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