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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.
| 6351. |
Assertion (A): An on off controller gives rise to oscillation of the output between two limits.Reason (R): Location of a pair of poles on j axis gives rise to self sustained oscillations in the output. |
| 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 | |
| 6352. |
Consider the following statements about transport-lag It is of non-minimum phase behaviourIt normally exists in thermal, hydraulic and pneumatic systemsIt has an excessive phase lag with no attenuation at high frequency Which of the above statements are correct? |
| A. | 1 only |
| B. | 1 and 2 |
| C. | All |
| D. | 2 and 3 |
| Answer» D. 2 and 3 | |
| 6353. |
The addition of a pole to the open loop transfer function pulls the root locus |
| A. | to the right |
| B. | to the left and making the system more stable |
| C. | towards right or left depending on the position of new pole |
| D. | none of the above |
| Answer» B. to the left and making the system more stable | |
| 6354. |
. It is required that response settles to within 2% of final value for a step input. The settling time is |
| A. | 20 sec |
| B. | 40 sec |
| C. | 35 sec |
| D. | 45 sec |
| Answer» C. 35 sec | |
| 6355. |
If zeros at infinity are included in the count, the number of zeros of G(s) H(s) is |
| A. | equal to number of poles |
| B. | one more than the number of poles |
| C. | one less than the number of poles |
| D. | none of the above |
| Answer» B. one more than the number of poles | |
| 6356. |
At low frequencies the factor e-j T and behave simple. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6357. |
Which of the following is used to obtain output position in a position control system? |
| A. | Strain gauge |
| B. | Load cell |
| C. | Synchro |
| D. | Thermistor |
| Answer» C. Synchro | |
| 6358. |
In a synchro transmitter-control transformer, the voltage induced in rotor winding of control transformer is zero when the angular displacement between rotors of transmitter and transformer is |
| A. | 0 |
| B. | 90 |
| C. | 180 |
| D. | either (a) or (c) |
| Answer» C. 180 | |
| 6359. |
In the given figure, the curves 1, 2, 3 are respectively for |
| A. | all pass, minimum phase and non-minimum phase functions |
| B. | minimum phase, all pass and non-minimum phase functions |
| C. | non-minimum phase, all pass and minimum phase functions |
| D. | minimum phase, non-minimum phase and all pass functions |
| Answer» C. non-minimum phase, all pass and minimum phase functions | |
| 6360. |
DC tachogenerator can be used in |
| A. | speed control system |
| B. | position control system |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 6361. |
In the given figure, the number of individual loops is |
| A. | 2 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» D. 6 | |
| 6362. |
Consider the following statementsThe effect of feedback is to reduce system errorFeedback increases the system gain at one frequency but reduces the system gain as another frequencyFeedback can cause an originally stable system to become unstable Which of the above statements are correct? |
| A. | 1, 2, 3 |
| B. | 1, 2 |
| C. | 2, 3 |
| D. | 1, 3 |
| Answer» E. | |
| 6363. |
The resolution of a wire wound potentiometer is about |
| A. | 0.001% |
| B. | 0.1% |
| C. | 1% |
| D. | 5% |
| Answer» C. 1% | |
| 6364. |
M circles are symmetrical with respect to |
| A. | real and imaginary axis |
| B. | M = 1 straight line and real axis |
| C. | M = 1 straight line and imaginary axis |
| D. | M = 1 straight line |
| Answer» C. M = 1 straight line and imaginary axis | |
| 6365. |
A lag compensator |
| A. | speeds up the transient response of the system |
| B. | improves steady state behaviour of the system |
| C. | improves steady state behaviour and speeds up the transient response of the system |
| D. | improves steady state behaviour and preserves the transient response of the system |
| Answer» E. | |
| 6366. |
The polar plot in the given figure is for G(j ) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-369-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-372-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-372-1.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-372-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-372-4.png"> | |
| 6367. |
In some on-off controllers a differential gap is provided |
| A. | to make the manufacture process easier |
| B. | to prevent too often frequent operation of controller |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) and (b) | |
| 6368. |
In Bode analysis the correction at corner frequency is 3 dB. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6369. |
Friction forces acts in a direction |
| A. | opposite to that of velocity |
| B. | same as that of velocity |
| C. | at right angle to that of velocity |
| D. | partly opposite and partly at right angle to the direction of velocity |
| Answer» B. same as that of velocity | |
| 6370. |
The slope of log magnitude asymptote changes by - 40 dB/ decade at a certain frequency and the error between asymptote and actual curve is - 6 dB. This means that |
| A. | a double pole is present |
| B. | a pair of complex conjugate poles is present |
| C. | either a double pole or a pair of complex conjugate poles is present |
| D. | either a pole or zero at that frequency is present |
| Answer» B. a pair of complex conjugate poles is present | |
| 6371. |
For a second order system delay time td is the time required to reach |
| A. | half the final value for the very first time |
| B. | the final value for the very first time |
| C. | 90% of the final value for the very first time |
| D. | none of the above |
| Answer» B. the final value for the very first time | |
| 6372. |
A feedback amplifier has forward gains A1, A2 and feedback factor as shown in signal flow graph of the given figure. Because of feedback as shown in signal noise ratio at output will |
| A. | increase |
| B. | decrease |
| C. | be unaffected |
| D. | depend on value of |
| Answer» D. depend on value of | |
| 6373. |
The slope of log magnitude curve changes by - 40 dB/decade at a certain frequency and the error between asymptote and actual curve is positive. This means that |
| A. | a double pole is present |
| B. | a pair of complex conjugate poles is present |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» C. either (a) or (b) | |
| 6374. |
For the system in the given figure . Then steady state error is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/24-211-1.png"> |
| B. | K |
| C. | Zero |
| D. | 1 |
| Answer» D. 1 | |
| 6375. |
The damping ratio of a pair of complex poles when expressed in terms of angle measured from j axis equal to |
| A. | sin |
| B. | cos |
| C. | tan |
| D. | cot |
| Answer» B. cos | |
| 6376. |
A system has high gain and phase margin. The system is |
| A. | very stable |
| B. | sluggish |
| C. | very stable and sluggish |
| D. | oscillatory |
| Answer» D. oscillatory | |
| 6377. |
For low frequencies such that , the log magnitude of factor is 0 dB. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6378. |
The open loop transfer function of a system is . If the frequency at the intersection of - 40 dB/decade line and 0 dB line is , then |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/18-118-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/18-118-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/18-118-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/18-118-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/18-118-3.png"> | |
| 6379. |
Consider the following statements regarding negative feedback It increases system gainIt improves sensitivityIt improves system stability Which of these are not correct? |
| A. | all |
| B. | 1, 2 |
| C. | 1, 3 |
| D. | 1 only |
| Answer» E. | |
| 6380. |
Which of the following are applications of position control systems? |
| A. | Control of sheet and metal thickness in hot rolling mill |
| B. | Missile guidance of ships |
| C. | Radar tracking system |
| D. | All of the above |
| Answer» E. | |
| 6381. |
Assertion (A): Increasing the system gain improves steady state behaviour but may result in instability.Reason (R): A compensator is inserted into a system to ensure specified performance. |
| 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 | |
| 6382. |
Assertion (A): Inverse Laplace transform can be found from P(s) by inversion integral.Reason (R): The function f(t) is assumed to be zero for t < 0. |
| 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 | |
| 6383. |
The system in the given figure has |
| A. | good gain and phase margins |
| B. | good gain margin and poor phase margin |
| C. | poor gain and phase margins |
| D. | poor gain margin but good phase margin |
| Answer» C. poor gain and phase margins | |
| 6384. |
Which dc servomotor has minimum inertia? |
| A. | Slotted armature construction |
| B. | Surface wound armature |
| C. | Surface wound with stationary rotor |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 6385. |
Gas flow resistance is defined as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-70-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-70-2.png"> |
| C. | (change in gas pressure difference) x (change in gas flow rate) |
| D. | none of the above |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-70-2.png"> | |
| 6386. |
Examine the following statements A small size hydraulic actuator can develop good torque.It is easy to maintain a hydraulic system leak proof.Both linear and rotatary hydraulic actuators are available.Hydraulic power is more easily available than electric power. Which of the above statements are correct? |
| A. | all |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2, 3 and 4 only |
| Answer» D. 2, 3 and 4 only | |
| 6387. |
For the transfer function , the polar plot a is |
| A. | semi circle |
| B. | circle |
| C. | spiral |
| D. | none of the above |
| Answer» D. none of the above | |
| 6388. |
A proportional controller is basically |
| A. | an amplifier with adjustable gain |
| B. | an integrating amplifier |
| C. | an amplifier with infinite gain |
| D. | an amplifier with almost zero gain |
| Answer» B. an integrating amplifier | |
| 6389. |
Assertion (A): The closeness of G(j ) locus to (- 1 + j0) point can be used as a measured of margin of stability.Reason (R): When the G(j ) locus comes close to encircling (- 1 + j0) point the system becomes oscillatory. |
| 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 | |
| 6390. |
For the system of the given figure |G(j )| = 0 dB at = |
| A. | 0 |
| B. | 1 rad/sec. |
| C. | |
| D. | 2.38 rad/sec. |
| Answer» E. | |
| 6391. |
The capacitance of a gas pressure vessel is defined as |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-71-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-71-2.png"> |
| C. | (change in gas stored) x (change in gas pressure) |
| D. | none of the above |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/15-71-2.png"> | |
| 6392. |
The polar plot of G(j ) = 1/j is |
| A. | positive imaginary axis |
| B. | positive real axis |
| C. | negative imaginary axis |
| D. | negative real axis |
| Answer» D. negative real axis | |
| 6393. |
For an unstable system the gain margin is indicative of how much the gain should be decreased to make the system stable. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6394. |
In the signal flow graph of the given figure, the number of forward paths is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 6395. |
At corner frequency the phase angle of factor 1/(1 + j T) is |
| A. | +90 |
| B. | -90 |
| C. | +45 |
| D. | -45 |
| Answer» E. | |
| 6396. |
The Nyquist plot in the given figure is for G(s) H(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/36-393-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/36-393-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/36-393-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/36-393-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/36-393-4.png"> | |
| 6397. |
Frequency response approach is a simple approach to control system design. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6398. |
The pole zero plot of the given figure is for |
| A. | non-minimum phase function |
| B. | minimum phase function |
| C. | all pass function |
| D. | none of the above |
| Answer» C. all pass function | |
| 6399. |
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 | |
| 6400. |
The given figure shows a hybrid servosystem. The components 1, 2, 3, 4 are respectively |
| A. | amplifier, demodulator, dc servomotor and load |
| B. | demodulator, amplifier, dc servomotor and load |
| C. | demodulator, dc servomotor, amplifier and load |
| D. | amplifier, dc servomotor, demodulator and load |
| Answer» B. demodulator, amplifier, dc servomotor and load | |