MCQOPTIONS
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MCQOPTIONS
This section includes 902 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
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) | |
| 652. |
The inverse Fourier transform of δ(t) is |
| A. | ‚à™(t) |
| B. | 1 |
| C. | δ(t) |
| D. | ej2pt |
| Answer» C. Œ¥(t) | |
| 653. |
For a second order system, damping ratio ζ is such that 0 < ζ |
| A. | real but not equal |
| B. | real and equal |
| C. | complex conjugate |
| D. | imaginary |
| Answer» D. imaginary | |
| 654. |
The standard deviation of a set of observations is the rms value of the deviation from the arithmetic mean. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 655. |
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. | |
| 656. |
If X(z) = 2az-1/(1 - az-1)3 and |a| < |z|, then the initial value x0 is |
| A. | 0 |
| B. | 1 |
| C. | ‚àû |
| D. | 2 |
| Answer» B. 1 | |
| 657. |
In the state equation x = AX + Bu is a n x m matrix. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 658. |
If xk = 0 for k < 0 and = 2k for k ‚â• 0 X(z) = z/(z -2). |
| A. | 1 |
| B. | |
| Answer» B. | |
| 659. |
For the system in the given figure |
| A. | yk = uk + 0.5 yk - 2 |
| B. | yk = uk + 0.5 uk - 2 |
| C. | yk = uk - 0.5 yk - 2 |
| D. | yk = uk - 0.5 uk - 2 |
| Answer» B. yk = uk + 0.5 uk - 2 | |
| 660. |
δ(t - b) is a pulse function. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 661. |
If I(s) = , initial value of i(t) is |
| A. | 0 |
| B. | 0.20833333333333 |
| C. | 0.41666666666667 |
| D. | - 5A |
| Answer» C. 0.41666666666667 | |
| 662. |
In the given figure f(t) is an even function. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 663. |
Assertion (A): The response of a network to an impluse is determined only by the parameters of the network.Reason (R): If f(t) is a unit parabolic function, its Laplace transform is 1/s3 |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 664. |
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. | |
| 665. |
State variable formulation is very suitable for computer solution. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 666. |
Assertion (A): The Fourier series of the wave shown in the figure does not contain even harmaonics Reason (R): If f(t) = - f(t ± T/2) the function is said to have half wave symmetry. |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 667. |
Assertion (A): The function δ'(t - b) is equal to 0 for t ≠ bReason (R): A number of impulses spaced from one another form an impulse train. |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 668. |
The signal m(t) = 10 cos 100 pt is sampled at the rate of Fs = 75 Hz, then determine signal after sampling. |
| A. | 4 cos 100 pt + 8 sin 200 pt |
| B. | 4 cos 100 pt + 8 sin 200 pt + cos 75 pt |
| C. | 4 cos 25 pt + 8 sin 50 pt + cos 75 pt |
| D. | none |
| Answer» D. none | |
| 669. |
If X(z) = (1 - az-1)-1 and |a| < |z|, the initial value x0 = 0 |
| A. | 1 |
| B. | |
| Answer» C. | |
| 670. |
A number of impulses spaced fron one another form an impulse train. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 671. |
If f(t) is an even function |
| A. | 1 |
| B. | |
| Answer» B. | |
| 672. |
If F(t) = δ(t - a), F(s)= |
| A. | 0 |
| B. | 1 |
| C. | e-as |
| D. | eas |
| Answer» D. eas | |
| 673. |
Assertion (A): If an event A can happen in m ways and another event B can happen in n ways, both can happen in mn ways.Reason (R): Two events are mutually exclusive if happening of either precludes the occurrence of other. |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 674. |
The z-transform of sequence x[n] = δ(n) is |
| A. | 1 |
| B. | ‚àû |
| C. | 0 |
| D. | z |
| Answer» B. ‚àû | |
| 675. |
An ac wave with superimposed dc is symmetrical about x - axis. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 676. |
A voltage wave is v = 50 sin ωt. 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 | |
| 677. |
If i = 10 + 12 cos 500t - 3.5 sin 500 t, then in amplitude phasse form i = |
| A. | 10 + 12.5 sin (500 t + 106.20°) |
| B. | 5 + 12.5 sin (500 t + 106.20°) |
| C. | 10 + 11 sin (500 t + 106.20°) |
| D. | 10 + 12.5 sin (500 t + 10°) |
| Answer» B. 5 + 12.5 sin (500 t + 106.20¬∞) | |
| 678. |
Assertion (A): For the determinant the minor fora11 is Reason (R): The minor of any element of a determinant ajk is the determinant which remains when the row and column corresponding to ajk are deleted. |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 679. |
(sI - A)-1 is equal to |
| A. | adj (sI - A)/det (sI - A) |
| B. | det (sI - A)/adj(sI - A ) |
| C. | [adj (sI - A)] [det(sI - A)] |
| D. | none of the above |
| Answer» B. det (sI - A)/adj(sI - A ) | |
| 680. |
The value of P(2 < x < 3) in function f(x) = K(x - 1) for K = 1 < x < 4 is |
| A. | |
| B. | 43525 |
| C. | 43526 |
| Answer» C. 43526 | |
| 681. |
Assertion (A): A sweep circuit operates by virtue of recurring transient phenomenon.Reason (R): Transients are always undesirable. |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» D. A is false, R is true | |
| 682. |
Assertion (A): Impulse function is an important function in network analysis.Reason (R): Convolution integral enables us to find the response of a network to an arbitary input in terms of the impulse response. |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 683. |
Z transform of [(Xk±k0)] = |
| A. | z±k0 X(z) |
| B. | z±k0 X(z) |
| C. | |
| Answer» B. z¬±k0 X(z) | |
| 684. |
Fourier transform of -jt f(t) is |
| A. | G'(f) |
| B. | 2pG'(f) |
| C. | |
| Answer» B. 2pG'(f) | |
| 685. |
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 | |
| 686. |
In a Communication system, noise is most likely to affect the signal. |
| A. | at the transmitter |
| B. | In the channel |
| C. | in Information source |
| D. | at the destination |
| Answer» C. in Information source | |
| 687. |
If a number of odd functions are added, the resultant sum is |
| A. | even function |
| B. | odd funtion |
| C. | either even or odd function |
| D. | mixture of odd amd even functions |
| Answer» C. either even or odd function | |
| 688. |
The value of the in + ve sense is |
| A. | jp/2 |
| B. | #NAME? |
| C. | #NAME? |
| D. | p/2 |
| Answer» E. | |
| 689. |
If v(t) is a time varying voltage, is |
| A. | initial current |
| B. | initial voltage |
| C. | initial charge |
| D. | initial flux leakages |
| Answer» E. | |
| 690. |
The range of values of a and b for which the linear time invariant system with impulse response. h(n) = an n ≥ 0         = bn n < 0 will be stable if |
| A. | |a| > 1, |b| > 1 |
| B. | |a| < 1, |b| < 1 |
| C. | |a| < 1, |b| > 1 |
| D. | |a| > 1, |b| < 1 |
| Answer» D. |a| > 1, |b| < 1 | |
| 691. |
If ξ f(t) = F(jω), ξf(t-a) = |
| A. | F(jω) e-jωa |
| B. | F(jω) ejωa |
| C. | |
| Answer» B. F(jœâ) ejœâa | |
| 692. |
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 | |
| 693. |
Assertion (A): L[e-at f(t)] = F(s + a) Reason (R): In use of Laplace transform method, initial conditions may be neglected. |
| 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 true, R is false |
| D. | A is false, R is true |
| Answer» C. A is true, R is false | |
| 694. |
If the value of |
| A. | cannot be determined |
| B. | 0 |
| C. | 1 |
| D. | ‚àû |
| Answer» B. 0 | |
| 695. |
If xk = ak and k ‚â• 0X(z) = (1 - az-1)-1 with |a| < |z| |
| A. | 1 |
| B. | |
| Answer» C. | |
| 696. |
If f(t)↔ F(jω), and f(t) is real, then F(- jω) |
| A. | F(jω) |
| B. | F*(j‚Üî) |
| C. | F*(- jω) |
| D. | none of these |
| Answer» C. F*(- jœâ) | |
| 697. |
The real part of complex frequency s corresponds to oscillations. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 698. |
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 | |
| 699. |
Energy density function is always |
| A. | even |
| B. | odd |
| C. | neither even nor odd |
| D. | both (a) and (b) |
| Answer» B. odd | |
| 700. |
The area of an impulse is |
| A. | 1 |
| B. | 0 |
| C. | ‚àû |
| D. | any finite value |
| Answer» B. 0 | |