Signals and Systems Quiz | Signals and Systems Objective Type Questions and Answers

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Questions
21 A function of one more variables which conveys information on the nature of physical phenomenon is called
A Noise
B Interference
C System
D Signal

Answer: Signal
22 Which one of the following is correct ? Energy of a power signal is
A Finite
B Zero
C Infinite
D Between 1 And 2

Answer: Infinite
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23 Which one of the following is correct ? A system can be completely described by a transfer function if it is
A Non-Linear And Continuous
B Linear And Time-Varying
C Non-Linear And Time-Invariant
D Linear And Time Invariant

Answer: Linear And Time Invariant
24 Convolution of two sequences X1 Z[n] and X2 [n] is represented as
A X1(z)* X2(z)
B X1(z) X2 (z)
C X1 (z) + X2(z)
D X1(z)/X2(z)

Answer: X1(z) X2 (z)
25 Laplace transforms of f(t) and g(t) are F(s) and G(s), respectively. Which one of the following expressions gives the inverse Laplace transform of F(s) G(s) ?
A f(t) g(t)
B f(t) /g(t)
C f(t) + g(t)
D f(t) *g(t)

Answer: f(t) *g(t)
26 The lengths of two discrete time sequence x1(n) and x2(n) are 5 and 7, respectively. What is the maximum length of a sequence x1(n)*x2(n) ?
A 5
B 6
C 7
D 11

Answer: 11
27 If the response of a system to an input does not depend on the future values of the input.Then which one of the following is true for the system ?
A It Is Aperiodic
B It Is Causal
C It Is Anticipator
D It Is Discrete

Answer: It Is Causal
28 What is the number of roots of the polynomial F(z) = 4z3 – 8z2 –z + 2, lying outside the unit circle ?
A 0
B 1
C 2
D 3

Answer: 1
29 Two rectangular waveforms of duration T1 and T2 seconds are convolved. What is the shape of the resulting waveform ?
A Triangular
B Rectangular
C Trapezoidal
D Semi-circular

Answer: Trapezoidal
30 What are the number of samples present in an impulse response called as?
A String
B Array
C Length
D Element

Answer: Length
31 The poles of a digital filter with linear phase response can lie
A only at z = 0
B only on the unit circle
C only inside the unit circle but not at z = 0
D on the left side of Real (z) =0 line

Answer: only at z = 0
32 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

Answer: sinusoid signals multiplied by decaying exponentials
33 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

Answer: invertible system
34 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 None of the above

Answer: only if bounded input generates unbounded output
35 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

Answer: Only if the value of an impulse response is zero for all negative values of time
36 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

Answer: decreases with an increase in the magnitude of an independent variable (x)
37 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

Answer: -1 < a < 0
38 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

Answer: x(t) = x( t +T0)
39 What is the area under a doublet function?
A Unity
B Negative
C Zero
D Positive

Answer: Zero
40 What are the singularity functions?
A Derivatives and integrals of unit impulse functions
B Derivatives of a unit impulse function
C Integrals of an impulse function
D Sum of successive impulse function

Answer: Derivatives and integrals of unit impulse functions

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