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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.
| 6051. |
If the number of ways an event may result ins analysed into m successes and n failures, each equally likely to occur, the probability of success in a single trial is m( m + n) |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6052. |
The function '(t - b) is a unit doublet. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6053. |
If n is the number of observations and r is the residue, the standard deviation = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-123-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-123-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-123-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-123-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-123-2.png"> | |
| 6054. |
The value of P(2 < x < 3) in function f(x) = K(x - 1) for K = 1 < x < 4 is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/17-265-1.png"> |
| B. | 1/3 |
| C. | 2/3 |
| D. | 1 |
| Answer» C. 2/3 | |
| 6055. |
Fourier transform of e-a|t| is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-154-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-154-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-154-4.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-154-1.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/12-154-4.png"> | |
| 6056. |
Consider the following statements If ensemble and time averages of a random process are identical, the process is ergodic.If ensemble and time average of a random process are not identical, the process is ergodic.An ergodic process is stationary.A stationary process is necessarily ergodic. Which of the above statements are correct? |
| A. | 1 only |
| B. | 1 and 3 only |
| C. | 1, 3 and 4 only |
| D. | 1 and 4 only |
| Answer» C. 1, 3 and 4 only | |
| 6057. |
For a periodic waveform, the power spectral density and correlation function form |
| A. | a Laplace transform pair |
| B. | a Fourier transform pair |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» C. either (a) or (b) | |
| 6058. |
For a Gaussian process, auto-correlation sequence also implies that |
| A. | statistical independence |
| B. | statistical dependence |
| C. | ergodic process |
| D. | all |
| Answer» C. ergodic process | |
| 6059. |
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» D. between 1 and 2 | |
| 6060. |
The energy associated with a function f(t) is. In terms of Fourier transform, E = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-120-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-120-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-120-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-120-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-120-2.png"> | |
| 6061. |
What about causality of the system transfer function of a discrete time system |
| A. | uncasual |
| B. | casual |
| C. | casual and some specific point |
| D. | Both b and c |
| Answer» C. casual and some specific point | |
| 6062. |
If f(t) is an odd function, F(j ) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-73-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-73-2.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» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/07-73-4.png"> | |
| 6063. |
The theoretical power of white noise is |
| A. | zero |
| B. | finite |
| C. | depend upon frequency of signal |
| D. | infninite |
| Answer» D. infninite | |
| 6064. |
If Sn is the power associated with each frequency component and S(f) is the sum of all these powers, normalised power spectral density is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-206-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-206-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-206-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/15-206-2.png"> | |
| 6065. |
In RLC circuits the state variables generally selected are |
| A. | voltages across capacitors |
| B. | currents through resistances and voltages across capacitors |
| C. | currents through resistances and capacitances |
| D. | currents through inductances and voltages across capacitances |
| Answer» E. | |
| 6066. |
Let x(t) X(j ) be F.T pair. The Fourier transform of the signal x(5t - 3) in terms of X(j ) is given as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-371-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-371-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-371-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-371-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/21-371-2.png"> | |
| 6067. |
For matrix A, A-1 A = 1 |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6068. |
If x(z) is the Z transform of sequence xk, the z transform of sequence (kxk)is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-109-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-109-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-109-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-109-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-109-3.png"> | |
| 6069. |
e-3t is a |
| A. | energy signal |
| B. | power signal |
| C. | Both (a) and (b) |
| D. | none |
| Answer» E. | |
| 6070. |
The area of an impulse is |
| A. | 1 |
| B. | 0 |
| C. | |
| D. | any finite value |
| Answer» B. 0 | |
| 6071. |
If the value of |
| A. | cannot be determined |
| B. | 0 |
| C. | 1 |
| D. | |
| Answer» B. 0 | |
| 6072. |
For the signal in the given figure the Fourier transform is Then the Fourier transform of the signal in the given figure |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-134-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-134-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-134-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-134-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/10-134-3.png"> | |
| 6073. |
The given figure shows a square wave i(t). Then I(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/08-95-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/08-95-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/08-95-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/08-95-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/08-95-2.png"> | |
| 6074. |
If the region of convergence of x1(n) + x2(n) is then the region of convergence of x1[n] - x2[n] includes |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-373-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-373-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-373-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/22-373-4.png"> |
| Answer» E. | |
| 6075. |
If xk = 2k for k 0 and = 0 for k > 0 X(z) = 2/(2 - z). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6076. |
The energy of highest value of Autocorrelation of a function 100 cos 50 pt is |
| A. | 50 |
| B. | 10 |
| C. | 200 |
| D. | zero |
| Answer» C. 200 | |
| 6077. |
The Z.T. of sequence x[n] = an [n] is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-311-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-311-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-311-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-311-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/19-311-3.png"> | |
| 6078. |
The output of a linear system for any input can be computed in which of the following ways? |
| A. | Only by summation of inpulse response by convolution integral |
| B. | Only by summation of step response by superposition integral |
| C. | Neither a nor b |
| D. | Either (a) or (b) |
| Answer» E. | |
| 6079. |
If f(t) = sgn(t), F(j ) |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-117-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-117-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-117-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/09-117-4.png"> |
| Answer» E. | |
| 6080. |
If xk = 0 for k < 0 and = 2k for k 0 X(z) = z/(z -2). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6081. |
In the given figure f(t) is an even function. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6082. |
The standard deviation of a set of observations is the rms value of the deviation from the arithmetic mean. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6083. |
x = AX + Bu is a state equation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6084. |
If f(- t) = f(t), the function f(t) has only cosine terms. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6085. |
Given that h(t) = 10e-10t u(t) and e(t) = sin 10t u(t). The Laplace transform of f(t) = h(t - t) e(t)dt is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-148-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-148-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-148-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-148-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-148-4.png"> | |
| 6086. |
If a complex voltage wave is applied to a pure inductance, the resulting current wave is much smoother than the voltage wave. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6087. |
The total area under the probability distribution curve is |
| A. | 1 |
| B. | 0 |
| C. | depend upon curve equation |
| D. | |
| Answer» B. 0 | |
| 6088. |
Which one of following is correct condition to check the stability of system? |
| A. | Bounded I/P unbounded O/P |
| B. | Bounded I/P and O/P |
| C. | Bounded O/P and I/P |
| D. | Bounded I/P Bounded O/P |
| Answer» C. Bounded O/P and I/P | |
| 6089. |
Let f1(t) = G1(t) + 4, f2(t) = G2(t) + 3. If G1(t) and G2(t) are uncorrected then the correlation between f1(t) and f2(t) are |
| A. | 12 |
| B. | 7 |
| C. | 6 |
| D. | zero |
| Answer» E. | |
| 6090. |
If I(s) = , initial value of i(t) is |
| A. | 0 |
| B. | 5 A |
| C. | 10 A |
| D. | - 5A |
| Answer» C. 10 A | |
| 6091. |
The DTFT of x(n) = (n) will be |
| A. | 1 |
| B. | 0 |
| C. | |
| D. | not defined |
| Answer» B. 0 | |
| 6092. |
The real part of complex frequency s corresponds to oscillations. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6093. |
A unit step function is used to represent the closing a switch in a constant voltage system. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6094. |
If then the sequence x[n] is |
| A. | periodic |
| B. | non-perodic |
| C. | depends on |
| D. | <i>n</i> |
| E. | none |
| Answer» C. depends on | |
| 6095. |
A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec and the sampled signal is passed through an ideal low pass filter with cut off frequency 800 Hz. The output signal has the frequency. |
| A. | 0 Hz |
| B. | 0.75 kHz |
| C. | 0.5 kHz |
| D. | 0.25 kHz |
| Answer» D. 0.25 kHz | |
| 6096. |
If autocorrelation sequence is Rc(n) = then what will be energy of sequence? |
| A. | 2 |
| B. | 24 |
| C. | 3 |
| D. | 288 |
| Answer» D. 288 | |
| 6097. |
If x(t) and its first derivative are Laplace transformable and Laplace of transform x(t) is X(s), then x(t) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-145-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-145-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-145-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-145-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/11-145-2.png"> | |
| 6098. |
For Ergodic Process |
| A. | ensemble Average equal to time Average |
| B. | ensemble Average is not equal to time Average |
| C. | ensemble Average > Time Average |
| D. | ensemble Average < Time Average |
| Answer» B. ensemble Average is not equal to time Average | |
| 6099. |
An excitation is applied to a system at t = T and the response in zero for - < t < T. This system is |
| A. | non casual |
| B. | stable |
| C. | casual |
| D. | unstable |
| Answer» D. unstable | |
| 6100. |
Average power for signal is |
| A. | 0 |
| B. | |
| C. | 1 |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/24-412-4.png"> |
| Answer» E. | |