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MCQOPTIONS
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.
| 6201. |
If X(z) = 2az-1/(1 - az-1)3 and |a| < |z|, then the initial value x0 is |
| A. | 0 |
| B. | 1 |
| C. | |
| D. | 2 |
| Answer» B. 1 | |
| 6202. |
Pick out the odd one |
| A. | stochastic variable |
| B. | stochastic function |
| C. | random variable |
| D. | random experiment |
| Answer» E. | |
| 6203. |
The derivative of unit step function is |
| A. | unit impulse |
| B. | ramp with slope 1 |
| C. | impulse |
| D. | either (a) or (b) |
| Answer» B. ramp with slope 1 | |
| 6204. |
The coefficients Fn in the exponential form of Fourier series are |
| A. | independent of frequency |
| B. | functions of frequency |
| C. | even function of frequency |
| D. | odd functions of frequency |
| Answer» C. even function of frequency | |
| 6205. |
A voltage v(t) which is a gaussian ergodic random process witha mean of zero and a varance of 4 volt2 is measured by a meter which first square and then reads its dc component. The reading will be |
| A. | 0 |
| B. | 4 |
| C. | 16 |
| D. | 2 |
| Answer» C. 16 | |
| 6206. |
Fourier transform is defined for |
| A. | periodic |
| B. | non-periodic |
| C. | finite duration |
| D. | all |
| Answer» C. finite duration | |
| 6207. |
L [f(t - a)] = F(j ) e-j a |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6208. |
The integral of unit step function is a ramp of slope unity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6209. |
eAt can be expanded as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-178-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-178-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-178-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-178-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-178-3.png"> | |
| 6210. |
If , f(t) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-205-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-205-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-205-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-205-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-205-4.png"> | |
| 6211. |
For a wave v = V 1m sin ( t + 1 ) - V3m sin (3 t + 3), the rms value is (0.5 V21m + 0.5 V23m)0.5 |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6212. |
F.T. of continuous non-periodic signal is |
| A. | aperiodic |
| B. | periodic |
| C. | a and b |
| D. | none |
| Answer» B. periodic | |
| 6213. |
The unit step response of a system starting from rest is given by c(t) = 1 - e-2t for t 0. The transfer function of the syste is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-378-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-378-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-378-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-378-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-378-3.png"> | |
| 6214. |
check the following system for causality y[n] = x[n] + 2x[n - 1]y[n] = x[n - k]y[n] = x[2n] |
| A. | (1) and (2) |
| B. | (2) and (3) |
| C. | (1) omly |
| D. | (1) and (3) |
| Answer» D. (1) and (3) | |
| 6215. |
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» D. Semi-circular | |
| 6216. |
The function Ae(s + j )t represens a rotating phasor having a magnitude increasing with time. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6217. |
The constant magnitude of G(s) plane are |
| A. | a family of straight horizontal lines |
| B. | a family of straight inclined lines with positive slope |
| C. | a family of straight inclined lines with negative slope |
| D. | a family of circles |
| Answer» E. | |
| 6218. |
For a closed loop systemThe imaginary axis intercept of the root loci will be |
| A. | j 2.8 |
| B. | J 0.28 |
| C. | j 1.14 |
| D. | j 11.4 |
| Answer» B. J 0.28 | |
| 6219. |
Assertion (A): In an automobile the amount of fuel admitted to the engine is adjusted as per the difference between desired and actual speed.Reason (R): The control signal is the amount of fuel to be admitted to the engine. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» C. A is correct but R is wrong | |
| 6220. |
A system is highly oscillatory if |
| A. | gain margin is high |
| B. | gain margin is close to 1 |
| C. | gain margin is close to 1 or phase margin is zero |
| D. | gain margin is high and phase margin is 180 |
| Answer» D. gain margin is high and phase margin is 180 | |
| 6221. |
Assertion (A): In root locus the breakaway and break in points either lie on real axis or occur in complex conjugate pairs.Reason (R): All root locus asymptotes intersect on real axis. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» C. A is correct but R is wrong | |
| 6222. |
Assertion (A): Integration in time domain is converted into division in s domainReason (R): |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | R is correct but A is wrong |
| Answer» C. A is correct but R is wrong | |
| 6223. |
The value of Integral (t) sin t dt is equal to |
| A. | zero |
| B. | 1 |
| C. | infinite |
| D. | undefined |
| Answer» B. 1 | |
| 6224. |
The energy of constant amplitude complex valued exponential sequence is ... |
| A. | A |
| B. | <sup>2</sup> |
| C. | |
| D. | 1 |
| E. | 0 |
| Answer» C. | |
| 6225. |
Let be the Fourier transform of y(n), then y(ej0) is |
| A. | 1/4 |
| B. | 2 |
| C. | 4 |
| D. | 4/3 |
| Answer» B. 2 | |
| 6226. |
The Laplace transform of a vlotage across a capacitor is Vc (s) = . If capacitor is 0.5 F, The current through capacitor at t = 0+ is |
| A. | 0 A |
| B. | 2 A |
| C. | 0.5 A |
| D. | 1 A |
| Answer» D. 1 A | |
| 6227. |
The value of Integral (t2 + 2) (t - 3)dt is equal to |
| A. | 11 |
| B. | 3 |
| C. | 9 |
| D. | 0 |
| Answer» E. | |
| 6228. |
A rectangular pulse train s(t) is shown in figure is convolved with the signal cos2(4p x 103t). The convolved signal will be a |
| A. | DC |
| B. | 12 kHZ sinusoidal |
| C. | 8 kHZ sinusoidal |
| D. | 14 kHZ sinusoidal |
| Answer» E. | |
| 6229. |
A voltage wave v = 10 + 20 sin t + 7.5 sin 3 (t) is applied to a series combination of two elements. The current is i = 5 sin ( t + 20 ) + 1.5 sin (3 t + 10 ). The elements are |
| A. | R and C |
| B. | R and L |
| C. | L and C |
| D. | both inductances |
| Answer» B. R and L | |
| 6230. |
For the function u(t - a) = 0 for t < a and u(t - a) = 1 fort a, the Laplace transform is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-7-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-7-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-7-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-7-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-7-3.png"> | |
| 6231. |
An ac sinusoidal wave has an rms value of 10 V. The peak to peak value is |
| A. | 10 V |
| B. | 0 V |
| C. | 14.14 V |
| D. | 28.28 V |
| Answer» E. | |
| 6232. |
A complex wave is 5 + 5 sin t. Its rms value is |
| A. | 7.07 V |
| B. | 5 V |
| C. | 10 V |
| D. | 6.12 V |
| Answer» E. | |
| 6233. |
The final value of is |
| A. | |
| B. | 2 |
| C. | 1 |
| D. | zero |
| Answer» D. zero | |
| 6234. |
The trignometric Fourier series of an even function of time does not have |
| A. | dc term |
| B. | cosine term |
| C. | sine term |
| D. | odd harmonic terms |
| Answer» D. odd harmonic terms | |
| 6235. |
Energy density spectrum of x[n] = an [n] for -1 < a < + 1 is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-293-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-293-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-293-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-293-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-293-4.png"> | |
| 6236. |
The impulse response of discrete time system is x[n] = (4)n [3 - n], the system is |
| A. | casual |
| B. | stable |
| C. | stable and casual |
| D. | stable and non-casual |
| Answer» E. | |
| 6237. |
The amplitude of the first odd harmonic of the square wave shown in the given figure is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-140-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-140-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-140-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-140-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-140-2.png"> | |
| 6238. |
Laplace transform of eat cos (at) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-172-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-172-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-172-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-172-2.png"> | |
| 6239. |
An ac wave with superimposed dc is symmetrical about x - axis. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6240. |
The Laplace transform of cos t is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-27-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-27-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-27-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-27-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/05-27-2.png"> | |
| 6241. |
Which of the following represents a stable system? Impulse response decreases exponentially.Area within the impulse response in finite.Eigen values of the system are positive and real.Roots of the characteristic equation of the system are real and positive. Select the answer using the following codes: |
| A. | 1 and 4 |
| B. | 1 and 3 |
| C. | 2, 3 and 4 |
| D. | 1, 2 |
| Answer» E. | |
| 6242. |
Auto correlation for t = 0 is equal to |
| A. | average power S of waveform |
| B. | square of average power S of waveform |
| C. | half of average power S of waveform |
| D. | square root of average power S of waveform |
| Answer» B. square of average power S of waveform | |
| 6243. |
The signal x(t) = A cos ( 0t + ) is |
| A. | energy signal |
| B. | power signal |
| C. | energy Power |
| D. | none |
| Answer» C. energy Power | |
| 6244. |
State variables which describe a system are a unique set. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6245. |
If (t) denotes a unit impulse, Laplace transform of is |
| A. | 1 |
| B. | <i>s<sup>2</sup></i> |
| C. | <i>s</i> |
| D. | <i>s</i> |
| E. | <sup>-2</sup> |
| Answer» C. <i>s</i> | |
| 6246. |
Energy density spectrum of a gate GT(t) function is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-286-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-286-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-286-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-286-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-286-2.png"> | |
| 6247. |
The Laplace transform of the waveform shown in the below figure is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-388-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-388-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-388-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/23-388-4.png"> |
| Answer» E. | |
| 6248. |
If , then x(n) series has |
| A. | alternates 0 |
| B. | alternate 1 |
| C. | alternate 2 |
| D. | alternate -1 |
| E. | <i>s</i> |
| Answer» B. alternate 1 | |
| 6249. |
If then, f(0+) and f( ) are given by |
| A. | 0 and 2 |
| B. | 2, 0 |
| C. | 0, 1 |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-175-4.png"> |
| E. | , 0 |
| Answer» C. 0, 1 | |
| 6250. |
The F.T. of a conjugate symmetric function is always |
| A. | imaginary |
| B. | real |
| C. | conjugate Unsymmetric |
| D. | conjugate symmetric |
| Answer» C. conjugate Unsymmetric | |