Explore topic-wise MCQs in Engineering.

This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

6101.

A linear discrete time system has the char. equation z3 - 0.81z = 0, the system is

A. stable
B. marginally stable
C. unstable
D. stability cannot be assessed from the given information
Answer» B. marginally stable
Discussion
6102.

which is the Laplace transform of x(t) = -e2t (t) t (t)?

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-380-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-380-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-380-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-380-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-380-3.png">
Discussion
6103.

Highest value of Autocorrelation of a function 100 cos 50 pt is

A. 50
B. 100
C. zero
D. 100/
E. <span class="symbol">p</span>
Answer» C. zero
Discussion
6104.

Short circuit is the dual of open circuit.

A. True
B. False
Answer» B. False
Discussion
6105.

Energy density function is always

A. even
B. odd
C. neither even nor odd
D. both (a) and (b)
Answer» B. odd
Discussion
6106.

Which one of the following is the correct statement? The region of convergence of z transform of x[n] consists of the values of z for which x[n] r-n is

A. absolutely integrable
B. absolutely summable
C. unity
D. < 1
Answer» C. unity
Discussion
6107.

Laplace transforn of sin ( t + a) is

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-160-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-160-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-160-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-160-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-160-3.png">
Discussion
6108.

A system with input x[n] and output y[n] is given as y[n] = (sin 5/6 pn) x(n) The system is

A. linear, stable and invertible
B. non-linear, stable and non-invertible
C. linear stable, non invertible
D. linear, unstable, invertible
Answer» D. linear, unstable, invertible
Discussion
6109.

The impulse response h[n] of a linear time invariant system is given by h[n] = [n + 3 ] + [n - 2] -2 [n -7]. The above system is

A. stable but non-casual
B. stable and casual
C. casual but unstable
D. unstable and not casual
Answer» B. stable and casual
Discussion
6110.

If v(t) = 0 for t &lt; 0 and e-at for t 0 V(j ) = 1/(a + j ).

A. True
B. False
Answer» B. False
Discussion
6111.

The term 'energy spectral density' is associated with

A. periodic waveform
B. non-periodic waveform
C. both perodic and non -perodic waveform
D. none of the above
Answer» C. both perodic and non -perodic waveform
Discussion
6112.

If f(t) = 1, F(j ) = 2p ( ).

A. True
B. False
Answer» B. False
Discussion
6113.

The state equations are in the form

A. X = AX + BW
B. X = AX + Bu
C. X = AX + Bx
D. either (a) or (b)
Answer» B. X = AX + Bu
Discussion
6114.

Following is a reason of distortion in communication system

A. external interference
B. random variations
C. insufficient Channel Bandwidth
D. all
Answer» E.
Discussion
6115.

The n state variables can be considered as n components of a state vector.

A. True
B. False
Answer» B. False
Discussion
6116.

The Laplace transform of sin t is

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-28-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-28-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-28-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-28-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-28-2.png">
Discussion
6117.

Fourier series is applicable for

A. periodic
B. finite duration
C. non periodic
D. a and b
Answer» E.
Discussion
6118.

Fourier transform of the unit step function (i.e., u(t) = 1 for t 0 and u(t) = 0 for t &lt; 0) is

A. <span class="symbol">p</span>
B. ( )
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-142-2.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-142-3.png">
E. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-142-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-142-3.png">
Discussion
6119.

The F.T. X(f) of the periodic delta functions.

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-395-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-395-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-395-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-395-4.png">
Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-395-4.png">
Discussion
6120.

The dirac delta function (t) is defined as

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-372-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-372-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-372-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-372-4.png">
Answer» E.
Discussion
6121.

For the single rectangular pulse of the given figureF(j ) = [Ad sin ( d/2)]/( d/2).

A. True
B. False
Answer» B. False
Discussion
6122.

Out of the three transforms viz. Z-transform, Laplace transform and Fourier transform

A. all three are used in continuous time domain
B. all three are used in both continuous time domain and discrete time domain
C. Z transform is used in continuous time domain while Laplace and Fourier transforms are used in discrete time domain
D. Z transform is used is discrete time domain while Laplace and Fourier transforms are used in continuous time domain
Answer» E.
Discussion
6123.

The inverse z-transform of X(z) is

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-381-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-381-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-381-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-381-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-381-2.png">
Discussion
6124.

In the representation f(t) = the set of complex coefficient Fn is the frequency spectrum of f(t)

A. True
B. False
Answer» B. False
Discussion
6125.

A number of impulses spaced fron one another form an impulse train.

A. True
B. False
Answer» B. False
Discussion
6126.

In a complex wave, the negative half of the wave is a reproduction of the positive half wave. Then

A. the wave contains only fundamental and third harmonic
B. the wave does not contain even harmonics
C. the wave does not contain odd harmonics
D. the wave does not contain triple harmonics
Answer» C. the wave does not contain odd harmonics
Discussion
6127.

consider the following as regards cumulative disribution function F(x)0 F(x) 1F(- ) = 0F( ) = 1F(x1) F(x2) If x1 &lt; x2 Out of above which are correct?

A. 1 and 2 only
B. 1, 2 and 3 only
C. 1, 2, 3 and 4
D. 2 and 4
Answer» D. 2 and 4
Discussion
6128.

If and k &gt; 0 X(z) = - In (1 - z-1) with 1 &lt; |z|

A. True
B. False
Answer» B. False
Discussion
6129.

The impulse response of the DT - LTI system is given below Check whether the system is StableCasualDynamic.

A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Answer» E.
Discussion
6130.

The units of F(j ) are volt-seconds.

A. True
B. False
Answer» B. False
Discussion
6131.

If f (t) is an even function, then in th form

A. True
B. False
Answer» B. False
Discussion
6132.

unit step is a

A. energy signal
B. power signal
C. neither energy nor power signal
D. none
Answer» C. neither energy nor power signal
Discussion
6133.

The eign values of n x n matrix A are the root of the characteristic equation 1 I - AI = 0

A. True
B. False
Answer» B. False
Discussion
6134.

(SI - A)-1 = adj(sI - A)/det (sI - A)

A. True
B. False
Answer» B. False
Discussion
6135.

A pulse function can be represented as difference of two equal step functions.

A. True
B. False
Answer» B. False
Discussion
6136.

If f(t) is an even function, F(j ) =

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-74-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-74-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-73-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-73-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-74-2.png">
Discussion
6137.

An experiment is repeated N times. One event A occurs NA times. Then

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-216-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-216-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-216-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-216-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-216-3.png">
Discussion
6138.

If I(s) = , fnal value of i(t) is

A. 0
B. 2.5
C. 12.5
D.
Answer» D.
Discussion
6139.

Choose correct option

A. var (X + Y) = Var (X) + Var (Y)
B. var (X - Y) = Var (X) + Var (Y)
C. var (X + Y) = Var (X) x Var (Y)
D. Both (a) and (b)
Answer» E.
Discussion
6140.

If v(t) is a time varying voltage, is

A. initial current
B. initial voltage
C. initial charge
D. initial flux leakages
Answer» E.
Discussion
6141.

An ac network has a power factor of 0.8 lagging for fundamental frequency. If the applied voltage contains thrid and fifth harmonics, the overall power factor will be

A. more than 0.8 lagging
B. 0.8 lagging
C. less than 0.8 lagging
D. 0.8 lagging or less
Answer» D. 0.8 lagging or less
Discussion
6142.

If otherwise find E(X)

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-272-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-272-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-272-3.png">
D. 0
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-272-2.png">
Discussion
6143.

Which of the following is the correct Laplace transform of the signal shown in the given figure

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-136-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-136-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-136-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-136-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-136-3.png">
Discussion
6144.

Which of the following can be impulse response of a casual system?

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-363-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-363-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-363-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-363-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-363-3.png">
Discussion
6145.

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

A. 0
B. 4
C. 2
D. 16
Answer» D. 16
Discussion
6146.

If f(t) is in volts, then F(j ) is in

A. volts
B. volt seconds
C. volts/sec
D. volt-sec
E. <sup>2</sup>
Answer» C. volts/sec
Discussion
6147.

The Nyquist sampling interval, for the signal sinc (700t) + sinc (500t) is

A. 1/350 sec
B. <span class="symbol">p</span>
C. /350 sec
D. 1/700 sec
E. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/20-345-4.png">
Answer» D. 1/700 sec
Discussion
6148.

The integral of a unit impulse is

A. a unit step function
B. a ramp function of slope 1
C. a pulse function of magnitude 1
D. none of the above
Answer» B. a ramp function of slope 1
Discussion
6149.

State variable formulation is very suitable for computer solution.

A. True
B. False
Answer» B. False
Discussion
6150.

A wave f(t) has half wave symmetry and time period equal to T. Then

A. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/06-62-1.png">
B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/06-62-2.png">
C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/06-62-3.png">
D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/06-62-4.png">
Answer» E.
Discussion