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Signals and systems MCQ Questions & Answers

Signals and systems MCQs : This section focuses on the "Signals and systems". These Multiple Choice Questions (MCQs) should be practiced to improve the Signals and systems skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Which one is a linear system?

A. y[n] = x[n] x x[n - 1]
B. y[n] = x[n] + x[n - 10]
C. y[n] = x2[n]
D. (a) and (c)

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Question 2

The ROC of sequence in the Z.T. of sequence x[n] = an ∪ [n] is

A. z > a
B. z < a
C. |z| > a
D. |z| < a

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Question 3

If £[f(t)] = F(s), then £[f(t - T)] =

A. est F(s)
B. e-st F(s)

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Question 4

The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0 ≤ t ≤ a and f(t) = 0 for t > a is

A. a step function
B. a pulse function
C. a shifted step function originating at t = a
D. none of the above

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Question 5

A signal g(t) = A then g(t) is a

A. energy signal
B. power signal
C. neither energy nor power signal
D. insufficient data

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Question 6

Feedback path is present in-

A. Open system
B. Closed system
C. Both open and closed system
D. Neither present in open nor in closed systems

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Question 7

Differentiation of ramp signal gives

A. Step signal
B. Impulse signal
C. 1
D. 0

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Question 8

If f(t) = A d(t - a), F(s) is

A. A e-as
B. A eas
C. A a e-as
D. Aa eas

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Question 9

As per time displacement theorem in Laplace transformation, displacement in the time domain by T becomes

A. division by s in the s domain
B. division by e-sT in the s domain
C. multiplication by s in the s domain
D. multiplication by e-sT in the s domain

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Question 10

An impulse function consist of

A. pure dc
B. pure a.c
C. entire frequency range with constant phase
D. infinite bandwidth with linear phase vaariations

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Question 11

A voltage V(t) is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt2. If it is measured by a dc meter. The reading will be

A. 0
B. 4
C. 2
D. 2

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Question 12

The analog signal given below is sampled by 600 samples per second for m(t) = 3 sin 500 pt + 2 sin 700 pt then folding frequency is

A. 500 Hz
B. 700 Hz
C. 300 Hz
D. 1400 Hz

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Question 13

Two function g1(t) and g2(t) with correlation of 6 has average power of 4 and 5 respectively. The power of g1(t) + g2(t) is

A. 9
B. 21
C. 3
D. 15

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Question 14

A first order system will never be able to give a __________ response band stopband passall pass Choose the correct option

A. 1, 2, 3 true
B. 1 and 3 true, 2 false
C. 1, 2 are true 3 is false
D. 1, 2 are false, 3 is true

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Question 15

Z transform is a non-linear operation.

A. TRUE
B. FALSE

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Question 16

Which one is a causal system?

A. y(n) = 3x[n] - 2x[n - 1]
B. y(n) = 3x[n] + 2x[n + 1]
C. y(n) = 3x[n + 1] + 2x[n - 1]
D. y(n) = 3x[n + 1] 2x[n - 1] + x[n]

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Question 17

Double integration of a unit step function would lead to

A. an impulse
B. a parabola
C. a ramp
D. a doublet

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Question 18

The analog signal m(t) is given below m(t) = 4 cos 100 pt + 8 sin 200 pt + cos 300 pt, the Nyquist sampling rate will be

A. 1/100
B. 1/200
C. 1/300
D. 1/600

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Question 19

A signal m(t) is multiplied by a sinusoidal waveform of frequency fc such thatv(t)=m(t) cos 2pfctIf Fourier transform of m(t) is M(f), Fourier transform of v(t) will be

A. 0.5 M(f + fc)
B. 0.5 M(f - fc)
C. 0.5 M(f + fc) + 0.5 M(f - fc)
D. 0.5 M(f - fc) + 0.5 M(f - fc)

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Question 20

A system where output depends on past and present inputs but not on future inputs is called-

A. Causal system
B. Non causal system
C. Stable system
D. Unstable system

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Question 21

In an ac circuit the fundamental component of current wave lags the corresponding voltage wave by 20°. The third harmonic component of current wave lags the corresponding voltage by an angle.

A. less than 20°
B. more than 20°
C. equal to 20°
D. equal to or more than 20°

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Question 22

In Laplace transform, multiplication by e-at in time domain becomes

A. translation by a in s domain
B. translation by (-a) in s domain
C. multiplication by e-as in s domain
D. none of the above

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Question 23

An energy signal has G(f) = 10. Its energy density spectrum is

A. 10
B. 100
C. 50
D. 20

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Question 24

A voltage wave having 5% fifth harmonic content is applied to a series RC circuit. The percentage fifth harmonic content in the current wave will be

A. 5%
B. more than 5%
C. less than 5%
D. equal or more than 5%

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Question 25

δ(t) is a

A. energy signal
B. power signal
C. neither energy nor power
D. none

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Question 26

The Fourier series of an odd periodic function contains

A. odd harmonics only
B. even harmonics only
C. cosine harmonics only
D. sine harmonics only

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Question 27

Under which condition among the following, will x(t) be a periodic signal?

A. x(t)=x(t+nT), where T=time period and n=natural number.
B. x(t)=x(t+nT), where T=time period and n=whole number.
C. x(t)=x(t+nT), where T=time period and n=integer
D. x(t)=x(t+nT), where T=time period and n=any finite integer.

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Question 28

If transfer function of a system is H(z) = 6 + z-1 + z-2 then system is

A. minimun phase
B. maximum phase
C. mixed phase
D. none

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Question 29

Which one most appropriate dynamic system?

A. y(n) + y(n - 1) + y(n + 1)
B. y(n) + y(n - 1)
C. y(n) = x(n)
D. y(n) + y(n - 1) + y(n + 3) = 0

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