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MCQOPTIONS
This section includes 519 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.
| 351. |
The slope of log magnitude curve near the cut off frequency is called cut off rate. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 352. |
Assertion (A): The part of root locus on the real axis is not dependent on the poles and zeros which are not on the real axis.Reason (R): Poles and zeros which are not on the real axis occur in conjugate pairs |
| 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» B. Both A and R are correct but R is not correct explanation of A | |
| 353. |
The sensor generally used in incremental optical encoder is |
| A. | LED |
| B. | LCD |
| C. | photodiode |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 354. |
The system in the given figure is |
| A. | type 0 system |
| B. | type 1 system |
| C. | type 2 system |
| D. | type 3 system |
| Answer» E. | |
| 355. |
Consider the following statements about root locus The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterionSegments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locusThe number of root locus branches terminating on infinity is always zero Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 1 only |
| D. | 2 and 3 only |
| Answer» C. 1 only | |
| 356. |
If Nyquist plot has a encirclement of (-1 + jo) point, the system is stable if |
| A. | there are no poles of G(s) H(s) in right-half plane |
| B. | there is one pole of G(s) H(s) in right-half plane |
| C. | there is no zeros of G(s) H(s) in right-half plane |
| D. | none of the above |
| Answer» B. there is one pole of G(s) H(s) in right-half plane | |
| 357. |
A network has . Then |
| A. | it is lead network |
| B. | it is lag network |
| C. | it is lead network if T1 > T2 and lag network T1 < T2 |
| D. | it is lead network if T1 < T2 and lag network T1 > T2 |
| Answer» D. it is lead network if T1 < T2 and lag network T1 > T2 | |
| 358. |
The pole-zero configuration of the given figure can be for |
| A. | lag compensator |
| B. | lead compensator |
| C. | lead-lag compensator |
| D. | series compensator |
| Answer» B. lead compensator | |
| 359. |
Given figure shows the magnitude plot for a system. The steady state error for unit step input is |
| A. | 1/101 |
| B. | 1/100 |
| C. | 14977 |
| D. | 14611 |
| Answer» D. 14611 | |
| 360. |
The transfer function of transportation lag is |
| A. | G(jω) = ejωT |
| B. | G(jω) = e-jωT |
| C. | G(jω) = (1 + jωT) |
| D. | G(jω) = (1 - jωT) |
| Answer» C. G(jœâ) = (1 + jœâT) | |
| 361. |
The polar plot of G(jω) = 1/jω is |
| A. | positive imaginary axis |
| B. | positive real axis |
| C. | negative imaginary axis |
| D. | negative real axis |
| Answer» D. negative real axis | |
| 362. |
Consider the following expressions which indicate the step or impulse response of an initially relaxed system [5 - 4 e-2t] u(t)[e-2t + 5] u(t)d(t) + 8 e-2t u(t)d(t) + 4 e-2t u(t) Those which correspond to the step and impulse response of the same system include |
| A. | 1 and 3 |
| B. | 1 and 4 |
| C. | 2 and 4 |
| D. | 2 and 3 |
| Answer» B. 1 and 4 | |
| 363. |
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 364. |
The units of thermal capacitance are |
| A. | k cal/°C |
| B. | °C/k cal |
| C. | °C sec/k cal |
| D. | none of the above |
| Answer» B. ¬∞C/k cal | |
| 365. |
In Bode analysis the correction at corner frequency is 3 dB. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 366. |
Nichols chart consists of |
| A. | constant magnitude loci |
| B. | constant phase angle loci |
| C. | magnitude and phase angle loci in log-magnitude versus phase diagram |
| D. | none of the above |
| Answer» D. none of the above | |
| 367. |
A stepper motor is essentially |
| A. | a synchronous motor |
| B. | induction motor |
| C. | dc motor |
| D. | either (b) or (c) |
| Answer» B. induction motor | |
| 368. |
Time rate of change in heat energy is analogous to |
| A. | voltage |
| B. | charge |
| C. | current |
| D. | voltage gradient |
| Answer» D. voltage gradient | |
| 369. |
In Bode plots, frequency is plotted on log scale. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 370. |
The polar plot of a transfer function passes through (-1, 0) point. The gain margin is |
| A. | zero |
| B. | - 1 dB |
| C. | 1 dB |
| D. | infinity |
| Answer» B. - 1 dB | |
| 371. |
The phase angle characteristic in the given figure is for |
| A. | all pass function |
| B. | transport lag |
| C. | minimum phase function |
| D. | none of the above |
| Answer» C. minimum phase function | |
| 372. |
For the transport lag G(jω) = e-jωT, the phase angle |
| A. | is constant |
| B. | varies linearly with frequency |
| C. | varies linearly with low frequencies only |
| D. | values as per square law |
| Answer» C. varies linearly with low frequencies only | |
| 373. |
The most commonly used devices for differencing and amplification, in control systems, are |
| A. | BJT amplifiers |
| B. | FET amplifiers |
| C. | operational amplifiers |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 374. |
Assertion (A): Laplace transform of impulse function is equal to area under the impulse.Reason (R): An impulse function whose area is unity is called unit impulse function. |
| 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 | |
| 375. |
In Bode diagram (log magnitude plot) of the factor 1/(1 + jωT) in the transfer function the log magnitude for ω |
| A. | 0 dB |
| B. | 20 log ωT dB |
| C. | -20 log ωT dB |
| D. | none of the above |
| Answer» B. 20 log œâT dB | |
| 376. |
In a second order system, peak overshoot is independent of |
| A. | damping factor |
| B. | natural frequency |
| C. | both damping factor and natural frequency |
| D. | neither damping factor nor natural frequency |
| Answer» C. both damping factor and natural frequency | |
| 377. |
Consider the following statements about polar plots Addition of a non-zero pole to a transfer function results in further rotation of polar plot through an angle of - 90° as ω → ∞Addition of a pole at the origin to a transfer function rotates the polar plot at zero and infinite frequencies by a further angle of - 90° Of the above statements: |
| A. | Both are correct |
| B. | Both are wrong |
| C. | 1 is correct and 2 is wrong |
| D. | 2 is correct and 1 is wrong |
| Answer» B. Both are wrong | |
| 378. |
Bellows converts |
| A. | pressure difference into displacement |
| B. | pressure difference into voltage |
| C. | displacement into pressure difference |
| D. | either (a) or (c) |
| Answer» B. pressure difference into voltage | |
| 379. |
For the system in the given figure, the transfer function C(s)/R(s) is |
| A. | G1 + G2 + G3 |
| B. | G1 G2 + G3 |
| C. | G1 G2 G3 |
| D. | (G1 + G2) G3 |
| Answer» C. G1 G2 G3 | |
| 380. |
The resolution of a wire wound potentiometer is about |
| A. | 0 |
| B. | 0.001 |
| C. | 0.01 |
| D. | 0.05 |
| Answer» C. 0.01 | |
| 381. |
Consider the following statements relating to synchrosRotor of control transformer is either disc shaped or umbrella shapedRotor of transmitter has low magnetic reluctanceTransmitter and control transformer pair act as error detector Out of above the correct statements are |
| A. | 1, 2, 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 382. |
Which control action is also called rate control? |
| A. | Proportional |
| B. | Derivative |
| C. | Integral |
| D. | Proportional plus integral |
| Answer» C. Integral | |
| 383. |
Consider following statements: Integral of absolute magnitude of error = Integral time-absolute error = Integral time-square error = Which of the above are correct? |
| A. | 1 and 3 |
| B. | 1 only |
| C. | 1 and 2 |
| D. | 2 and 3 |
| Answer» D. 2 and 3 | |
| 384. |
Generally a servomotor operates at |
| A. | high torque and high speed |
| B. | low torque and low speed |
| C. | low torque and high speed |
| D. | high torque and low speed |
| Answer» D. high torque and low speed | |
| 385. |
In control systems the word controller includes |
| A. | error detector and feedback element |
| B. | feedback element and control elements |
| C. | error detector and control elements |
| D. | error detector, control elements and feedback elements |
| Answer» D. error detector, control elements and feedback elements | |
| 386. |
For quadratic factor. In Bode log magnitude plot the high frequency asymptote is a straight line having the slope |
| A. | -20 dB per decade |
| B. | +20 dB per decade |
| C. | -40 dB per decade |
| D. | +40 dB per decade |
| Answer» D. +40 dB per decade | |
| 387. |
The given figure shows log magnitude versus ω plots of a system for different values of gain. For this system |
| A. | curve 1 shows highest gain margin and curve 2 shows poorest gain margin |
| B. | gain margins shown by the three curves are equal |
| C. | curve 1 shows poorest gain margin and curve 3 shows highest gain margin |
| D. | curve 3 shows poorest gain margin while curve 1 shows highest gain margin |
| Answer» D. curve 3 shows poorest gain margin while curve 1 shows highest gain margin | |
| 388. |
Assertion (A): In liquid system the ratio of change in liquid level to change in flow rate is called resistance of liquid flow.Reason (R): In liquid level systems the ratio of change in liquid stored in a tank to the change in head is called capacitance of tank. |
| 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 | |
| 389. |
The gain margin of first and second order systems is infinite. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 390. |
In the given figure x6 = |
| A. | de(ax1 + bx2 + cx3) |
| B. | (a + b + c) (x1 + x2 + x3) (d + e) |
| C. | (ax1 + bx2 + cx3) (d + e) |
| D. | a b c d e (x1 + x2 + x3) |
| Answer» B. (a + b + c) (x1 + x2 + x3) (d + e) | |
| 391. |
In the signal flow graph in the given figure the number of forward paths and pairs of non-touching loops are respectively |
| A. | 3 and 1 |
| B. | 3 and 2 |
| C. | 4 and 2 |
| D. | 2 and 4 |
| Answer» B. 3 and 2 | |
| 392. |
A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of |
| A. | -200 dB/decade |
| B. | -240 dB/decade |
| C. | -280 dB/decade |
| D. | -320 dB/decade |
| Answer» B. -240 dB/decade | |
| 393. |
For the function G(s) H(s) = the phase cross-over frequency is |
| A. | 0.5 rad/sec |
| B. | 0.707 rad/sec |
| C. | 1.732 rad/sec |
| D. | 2 rad/sec |
| Answer» C. 1.732 rad/sec | |
| 394. |
From the noise point of view, bandwidth should |
| A. | be large |
| B. | not be too large |
| C. | should be as large as possible |
| D. | should be infinite |
| Answer» C. should be as large as possible | |
| 395. |
The frequency at which phase angle is 180° is called |
| A. | phase crossover frequency |
| B. | stability limit frequency |
| C. | frequency of limited stability |
| D. | gain margin frequency |
| Answer» B. stability limit frequency | |
| 396. |
Assertion (A): Derivative control action is also called rate control and has an anticipatory character.Reason (R): Derivative control amplifies noise signals. |
| 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 | |
| 397. |
For 0 < M < 1, the centres of M circle lie to the right of origin. |
| A. | 1 |
| B. | |
| C. | Both A and R are correct and R is correct explanation of A |
| D. | Both A and R are correct but R is not correct explanation of A |
| Answer» B. | |
| 398. |
The effect of negative feedback on distortion and bandwidth because |
| A. | both are decreased |
| B. | both are increased |
| C. | distortion is reduced and bandwidth is increased |
| D. | distortion is increased and bandwidth is decreased |
| Answer» D. distortion is increased and bandwidth is decreased | |
| 399. |
A lead compensator is basically a |
| A. | high pass filter |
| B. | low pass filter |
| C. | band stop filter |
| D. | none of the above |
| Answer» B. low pass filter | |
| 400. |
The polar plot in the given figure is for the term |
| A. | jωT |
| B. | 1 + jωT |
| Answer» C. | |