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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.
| 6151. |
The units of the spectrum obtained be Fourier transforming the covariance function of a stationery Stochastic Process is |
| A. | Power per Hz |
| B. | energy per Hz |
| C. | Power per sec |
| D. | Energy per second |
| Answer» C. Power per sec | |
| 6152. |
If v(t) = 0 for t < 0 and v(t) = e -at for t 0, V(j ) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-155-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-155-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-155-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-155-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-155-3.png"> | |
| 6153. |
FIR digital filter having __________ stability than FIR filter. |
| A. | good stability |
| B. | poor stability |
| C. | stability not guarnteed |
| D. | poor stability |
| Answer» B. poor stability | |
| 6154. |
If xk = ak and k < 0X(z) = - (1 - az-1)-1 with |z| < |a| |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6155. |
Fourier transform of unit step function is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-277-1.png"> |
| B. | <span class="symbol">p</span> |
| C. | ( ) |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-277-3.png"> |
| E. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-277-4.png"> |
| Answer» E. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-277-4.png"> | |
| 6156. |
When a complex voltage wave is applied to a capacitor the resulting current wave is more distorted than the voltage wave. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6157. |
Auto correlation R(t) of a function v(t) is defined as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-210-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-210-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-210-3.png"> |
| D. | noe of these |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-210-2.png"> | |
| 6158. |
Parseval's theorem for energy tells that |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-284-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-284-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-284-3.png"> |
| D. | Not defined for energy |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-284-3.png"> | |
| 6159. |
State space analysis is applicable to |
| A. | time invariant systems |
| B. | time varying systems |
| C. | both time invariant and time varying systems |
| D. | none of the above |
| Answer» D. none of the above | |
| 6160. |
Given, Lf(t) = F(s) &Rightarrow; which of the following expression are correct? L[f(t - a) (t - a)] = F(s)e-saL(t - a)f(t) = as F(s) Select the correct answer using the codes given below |
| A. | 1, 2, 3 |
| B. | 1, 2, 4 |
| C. | 2, 3, 4 |
| D. | 1, 3, 4 |
| Answer» C. 2, 3, 4 | |
| 6161. |
If X(z) = (1 - az-1), and |a| < |z|, the initial value x0 is |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | |
| Answer» B. 0 | |
| 6162. |
consider the following as regards probability distribution function f(x)f(x) = 0 for all xcumulative distribution function which of the above are correct? |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 1, 2 and 3 |
| D. | 1 and 3 only |
| Answer» D. 1 and 3 only | |
| 6163. |
If for k 0 and xk = 0 for k < 0, z transform of the sequence x is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-106-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-106-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-106-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-106-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-106-2.png"> | |
| 6164. |
Fourier transform of non periodic DT signal is |
| A. | aperiodic |
| B. | Periodic |
| C. | both a and b |
| D. | None of these |
| Answer» C. both a and b | |
| 6165. |
The function shown in the figure |
| A. | impulse function |
| B. | signum function |
| C. | unit step function |
| D. | none of the above |
| Answer» C. unit step function | |
| 6166. |
The triangular wave of the given figure can be written as v(t) = u(t) - tu(t) + (t - 1) u(t - 1) |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6167. |
If f(t) = - f(- t) satisfies Drichlet conditions, then f(t) can be expanded in Fourier series containing |
| A. | only sine terms |
| B. | only cosine terms |
| C. | cosine terms and constant |
| D. | sine terms and constant |
| Answer» B. only cosine terms | |
| 6168. |
The joint probability function of two discrete random variable X and Y is given by x = 0, 2, y = 2, 3 then E(y) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-271-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-271-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-271-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-271-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-271-3.png"> | |
| 6169. |
The joint probability function of two discrete random variable X and Y is given by x = 0, 2, y = 2, 3 variance 2 will be[Hint: 2 = E(X2) - 2 &Rightarrow; E(X2) - (E(X))2] |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-273-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-273-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-273-3.png"> |
| D. | zero |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-273-3.png"> | |
| 6170. |
A probability density function is given by p(x) = Ke-x2/2 for - < x < , The value of K should be |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-173-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-173-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-173-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-173-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-173-2.png"> | |
| 6171. |
The Laplace transform of f(t) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-16-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-16-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-16-3.png"> |
| D. | none of the above |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-16-3.png"> | |
| 6172. |
The stationary process has |
| A. | all the statistical Properties dependent on time. |
| B. | all the statistical Properties independent of time. |
| C. | aime average is equal to ensemble average. |
| D. | zero variance. |
| Answer» C. aime average is equal to ensemble average. | |
| 6173. |
An ac network has a power factor of 0.8 leading if the applied wave is of fundamental frequency. If the applied wave contains third and fifth harmonics, the overall power factor will be |
| A. | 0.8 leading |
| B. | less than 0.8 leading |
| C. | more than 0.8 leading |
| D. | 0.8 leading or more |
| Answer» D. 0.8 leading or more | |
| 6174. |
A voltage wave is i = 100 sin ( t). Its average value calculated over one half cycle is |
| A. | zero |
| B. | 70.72 V |
| C. | 63.70 V |
| D. | none of the above |
| Answer» D. none of the above | |
| 6175. |
A voltage wave is v = 50 sin t. Its average value calculated over full one cycle is |
| A. | zero |
| B. | 35.36 V |
| C. | 31.85 V |
| D. | none of the above |
| Answer» B. 35.36 V | |
| 6176. |
The z transform of x(n) = (n) |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-310-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-310-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-310-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-310-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-310-2.png"> | |
| 6177. |
DTFT (Discrete time Fourier transform) of x[n] = an [n] for -1 < a < + 1. |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-292-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-292-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-292-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-292-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/18-292-2.png"> | |
| 6178. |
A casual system having the transfer function is excited with 10 (t). The time at which the output reaches 99% of its steady-state value is |
| A. | 2.7 sec |
| B. | 2.5 sec |
| C. | 2.3 sec |
| D. | 2.1 sec |
| Answer» D. 2.1 sec | |
| 6179. |
If i(t) is a time varying current, is |
| A. | initial current |
| B. | initial charge |
| C. | initial flux leakages |
| D. | initial voltage |
| Answer» C. initial flux leakages | |
| 6180. |
In the state equation x = AX + Bu is a n x m matrix. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6181. |
The function f(t) in the given figure will have its Laplace transform as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-161-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-161-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-161-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-161-4.png"> |
| Answer» E. | |
| 6182. |
The joint probability function of two discrete random variable X and Y is given by x = 0, 2, y = 2, 3 then E(X) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-270-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-270-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-270-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-270-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-270-3.png"> | |
| 6183. |
The effective value of the waveform in the given figure is |
| A. | 5 |
| B. | 2.5 |
| C. | <span class="root">2.5</span> |
| D. | <span class="root">5.0</span> |
| Answer» E. | |
| 6184. |
The integral of a unit step function is |
| A. | a unit impulse function |
| B. | a unit pulse function |
| C. | a ramp function of slope 1 |
| D. | none of the above |
| Answer» D. none of the above | |
| 6185. |
Highest value of autocorrelation function 100 sin 50 pt is |
| A. | 50 |
| B. | zero |
| C. | 100 |
| D. | 100/ |
| E. | <span class="symbol">p</span> |
| Answer» C. 100 | |
| 6186. |
The initial value theorem is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-20-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-20-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-20-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-20-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/04-20-4.png"> | |
| 6187. |
A unit impulse voltage is applied to an inductance at t = 0. The current at t = 0 will be |
| A. | 0 |
| B. | L amperes |
| C. | |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/08-90-4.png"> |
| Answer» E. | |
| 6188. |
The exponential form of Fourier series is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/06-65-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/06-65-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/06-65-3.png"> |
| D. | Both (a) and (b) |
| Answer» E. | |
| 6189. |
A voltage wave containing 10% third harmonic is applied to a scries R-L circuit. The percentage third harmonic content in the current wave will be |
| A. | more than 10% |
| B. | 10% or less than 10% |
| C. | less than 10% |
| D. | 10% or more or less |
| Answer» D. 10% or more or less | |
| 6190. |
Principle of superposition is applicable to |
| A. | linear systems only |
| B. | nonlinear systems only |
| C. | both linear and non linear system |
| D. | linear systems and some nonlinear systems |
| Answer» B. nonlinear systems only | |
| 6191. |
Consider z transform of a signal as given belowthen the response will be |
| A. | IIR |
| B. | FIR |
| C. | Depends on value of |
| D. | <i>n</i> |
| E. | Cannot determined |
| Answer» C. Depends on value of | |
| 6192. |
The Laplace transform of unit ramp function starting at t = a is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-180-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-180-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-180-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-180-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-180-4.png"> | |
| 6193. |
A signal f(t) = cos 10pt + 3 cos 4pt is instantaneously sampled. The maximum allowable value of sampling interval Ts in sec is |
| A. | 1 / 4 sec |
| B. | 1 / 8 sec |
| C. | 1 / 8p sec |
| D. | 1 / 10 sec |
| Answer» E. | |
| 6194. |
A rectangular pulse is passed through an L.P.F. The response is a |
| A. | triangular |
| B. | trapezoidal function |
| C. | sampling |
| D. | Both (a) and (b) |
| Answer» B. trapezoidal function | |
| 6195. |
(t - b) is a pulse function. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6196. |
For exponential function e-at the Laplace transform 1/(s - a) |
| A. | True |
| B. | False |
| Answer» C. | |
| 6197. |
Fourier transform pair are |
| A. | autocorrelation and power spectral density |
| B. | autocorrelation and convoloution |
| C. | convolution and power spectral density |
| D. | autocorrelation and energy |
| Answer» B. autocorrelation and convoloution | |
| 6198. |
The function x(t) is shown in the given figure. Even and odd parts of a unit step function (t) are respectively, |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-361-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-361-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-361-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-361-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-361-2.png"> | |
| 6199. |
In the given figure 15.5 show a discrete time system consisting of a unit delay system, a multiplier and a summer, such that y(k) = x(k - 1) + 0.5 x(k). This system |
| A. | is linear |
| B. | is non linear |
| C. | may be linear or non linear depending on value |
| D. | impossible to judge |
| Answer» B. is non linear | |
| 6200. |
An RLC series circuit has a variable inductance. The value of L for resonance conditions at fundamental frequency is 0.18 H. For resonance conditions at third harmonic frequency the value of inductance is |
| A. | 0.54 H |
| B. | 0.06 H |
| C. | 0.02 H |
| D. | 1.62 H |
| Answer» D. 1.62 H | |