# MCQ On Signals And Systems: Signals And Systems Q&A

MCQ On Signals And Systems Part 2. Electronics Engineering Multiple-Choice Questions related to Signals And Systems. MCQ On Signals And Systems Part 1 is available here

## MCQ On Signals And Systems

What does the term y(-1) indicate especially in an equation that represents the behavior 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

Recursive Systems are basically characterized by the dependency of its output on _______ ??

a. Present input
b. Past input
c. Previous outputs
d. All of the above

Which among the following belongs to the category of non-recursive systems ??

a. Causal FIR Systems
b. Non-causal FIR Systems
c. Causal IIR Systems
d. Non-causal IIR Systems

Which type/s of the discrete-time system does not exhibit the necessity of any feedback ??

a. Recursive Systems
b. Non-recursive Systems
c. Both a & b
d. None of the above

Which block of the discrete-time systems requires memory in order to store the previous input ??

b. Signal Multiplier
c. Unit Delay

### MCQ Electronic Engineering

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

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

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

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

a. Only if the value of an impulse response is zero for all negative values of time
b. Only if the value of an impulse response is unity for all negative values of time
c. Only if the value of an impulse response is infinity for all negative values of time
d. Only if the value of an impulse response is negative for all negative values of time

A system is said to be shift-invariant only if ______ ??

a. a shift in the input signal also results in the corresponding shift in the output
b. a shift in the input signal does not exhibit the corresponding shift in the output
c. a shifting level does not vary in input as well as output
d. a shifting at input does not affect the output

MCQ On Signals And Systems

An amplitude of sinc function that passes through zero at multiple values of an independent variable ‘x’ ______ ??

a. Decreases with an increase in the magnitude of an independent variable (x)
b. Increases with an increase in the magnitude of an independent variable (x)
c. Always remains constant irrespective of variation in magnitude of ‘x’
d. Cannot be defined

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

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

Which property of the 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

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

MCQ On Signals And Systems

Which type of standard PDFs has/ have an ability to describe an integer-valued random variable concerning the repeated trials carried /conducted in an experiment ??

a. Binomial
b. Uniform
c. Both a & b
d. None of the above

What would happen if the value of term [(m-x) / (σ √2)]  increases in the expression of Gaussian CDF ??

a. Complementary error function also goes on increasing
b. Complementary error function goes on decreasing
c. Complementary error function remains constant or unchanged
d. Cannot predict

A random variable belongs to the category of a uniform PDF only when ______ ??

a. It occurs in a finite range
b. It is likely to possess zero value outside the finite range
c. Both a & b
d. None of the above

Which among the below mentioned standard PDFs is/are applicable to discrete random variables ??

a. Gaussian distribution
b. Rayleigh distribution
c. Poisson distribution
d. All of the above

When do the conditional density functions get converted into the marginal density functions ??

a. Only if random variables exhibit statistical dependency
b. Only if random variables exhibit statistical independency
c. Only if random variables exhibit deviation from its mean value
d. None of the above

MCQ On Signals And Systems

What is the value of an area under the conditional PDF ??

a. Greater than ‘0’ but less than ‘1’
b. Greater than ‘1’
c. Equal to ‘1’
d. Infinite

The Joint Cumulative Density Function (CDF) _____ ??

a. Is a non-negative function
b. Is a non-decreasing function of x & y planes
c. Is always a continuous function in xy plane
d. All of the above

Consider the assertions given below
A : CDF is a monotonously increasing function
B : PDF is a derivative of CDF & is always positive

Which among them is correct according to the properties of PDF ??

a. A is true & B is false
b. A is false & B is true
c. Both A & B are true but B is a reason for A
d. Both A & B are false since B is not a reason for A

What would be the joint probability of statistically independent events that occur simultaneously ??

a. Zero
b. Not equal to zero
c. Infinite
d. None of the above

What would happen if the two events are statistically independent ??

a. Conditional probability becomes less than the elementary probability
b. Conditional probability becomes more than the elementary probability
c. Conditional probability becomes equal to the elementary probability
d. Conditional as well as elementary probabilities will exhibit no change