MCQOPTIONS
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MCQOPTIONS
This section includes 646 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 501. |
In control systems the magnitude of error voltage |
| A. | is very small |
| B. | is very large |
| C. | neither small nor large |
| D. | may be any value from 0 to 50 V |
| Answer» B. is very large | |
| 502. |
For an m x n matrix A, the eigen values are the roots of the characteristic equation |
| A. | |I - A| |
| B. | |λI - A| = 0 |
| C. | |λA - I| = 0 |
| D. | |A - I| = 0 |
| Answer» C. |λA - I| = 0 | |
| 503. |
At corner frequency the phase angle of factor 1/(1 + jωT) is |
| A. | +90° |
| B. | -90° |
| C. | +45° |
| D. | -45° |
| Answer» E. | |
| 504. |
In the given figure the input frequency f = 0.1 (1/2 π RC) |
| A. | 0 dB |
| B. | 3 dB |
| C. | -3 dB |
| D. | 20 dB |
| Answer» B. 3 dB | |
| 505. |
The log magnitude curve of factor jω is a straight line having a slope of 20 dB/decade. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 506. |
Assertion (A): If minimum phase system has a gain margin of 8 dB and phase margin of 21°, the system is stable.Reason (R): For a minimum phase system both GM and PM must be positive for the system to be stable. |
| 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 | |
| 507. |
If a system is to follow arbitrary inputs accurately the bandwidth should be |
| A. | large |
| B. | small |
| C. | very small |
| D. | neither small nor large |
| Answer» B. small | |
| 508. |
The frequency at which magnitude of closed loop frequency response is 3 dB below its zero frequency value is called critical frequency. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 509. |
For low frequencies such that ω |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 510. |
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 | |
| 511. |
A feedback amplifier has forward gains A1, A2 and feedback factor β 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 β |
| Answer» D. depend on value of β | |
| 512. |
Which of the following represents constant magnitude locus for M = 1? |
| A. | x = -0.5 |
| B. | x = 0 |
| C. | x² + y² = 1 |
| D. | (x + 1)² + y² = 1 |
| Answer» B. x = 0 | |
| 513. |
The transfer function of transportation lag is |
| A. | G(jω) = e^(jωT) |
| B. | G(jω) = e^(-jωT) |
| C. | G(jω) = (1 + jωT) |
| D. | G(jω) = (1 - jωT) |
| Answer» C. G(jω) = (1 + jωT) | |
| 514. |
The polar plot of |
| A. | does not cross real axis |
| B. | crosses real axis once |
| C. | crosses real axis 2 times |
| D. | crosses real axis 4 times |
| Answer» B. crosses real axis once | |
| 515. |
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) | |
| 516. |
In response to a unit step input the controller output in given figure is for |
| A. | proportional controller |
| B. | proportional plus integral controller |
| C. | integral controller |
| D. | none of the above |
| Answer» C. integral controller | |
| 517. |
If a zero is added to a second order underdamped system |
| A. | the peak overshoot is increased |
| B. | the peak overshoot is decreased |
| C. | the peak overshoot remains unchanged |
| D. | either (a) or (b) |
| Answer» B. the peak overshoot is decreased | |
| 518. |
The pole zero plot of the given figure is for |
| A. | non-minimum phase function |
| B. | minimum phase function |
| C. | all pass function |
| D. | either (b) or (c) |
| Answer» B. minimum phase function | |
| 519. |
The polar plot of the given figure can be for G(jω) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 520. |
For G(jω) = 1 / (1+jωT) as ω approaches infinity, the magnitude approaches zero and phase angle approaches - 90°. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 521. |
Frequency response approach is a simple approach to control system design. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 522. |
For the system in the given figure, the ratio C(s)/R(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 523. |
Assertion (A): When a PID controller is added to a system, the peak overshoot to step input cannot be determined easily.Reason (R): Use of PID controller introduces a zero in the forward path. |
| 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 | |
| 524. |
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. | |
| 525. |
The Nyquist plot in the given figure is for G(s) H(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 526. |
Assertion (A): The closeness of G(jω) locus to (- 1 + j0) point can be used as a measured of margin of stability.Reason (R): When the G(jω) 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 | |
| 527. |
The log magnitude curve for a constant gain K is a |
| A. | horizontal straight line |
| B. | horizontal straight line of magnitude 20 log K decibels |
| C. | an inclined line having slope K |
| D. | an inclined line having slope -K |
| Answer» C. an inclined line having slope K | |
| 528. |
In an armature controlled dc motor let J be equivalent moment of inertia of motor and load, f0 be equivalent viscous friction coefficient of motor and load and θ be angular displacement of motor shaft. Then torque equation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 529. |
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 | |
| 530. |
A system with following transfer function may be approximated by the system |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 531. |
The system of the given figure |
| A. | has two poles and one zero in left half plane |
| B. | has two poles and one zero in right half plane |
| C. | has two poles in left half plane and zero in right half plane |
| D. | none of the above |
| Answer» D. none of the above | |
| 532. |
The following transfer function can be for |
| A. | lead compensator |
| B. | lag compensator |
| C. | lead-lag compensator |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 533. |
If phase angle of open loop transfer function becomes - 180° at frequency ω1, then gain margin is equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 534. |
For the system of the given figure the transfer function E₀(s)/Ei(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 535. |
For the system in the given figure. The transfer function C(s)/R(s) is |
| A. | G1 + G2 + 1 |
| B. | G1 G2 + 1 |
| C. | G1 G2 + G2 + 1 |
| D. | G1 G2 + G1 + 1 |
| Answer» D. G1 G2 + G1 + 1 | |
| 536. |
In the given figure shows pole-zero plot. If steady state gain is 2 the transfer function G(s) is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 537. |
For the system of the given figure, the damping ratio of closed loop poles is |
| A. | 1.5 |
| B. | 1 |
| C. | 0.5 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 538. |
For the system in the given figure the characteristic equation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 539. |
The transfer function technique is considered as inadequate under which of the following conditions ? |
| A. | Systems having complexities and non-linearities |
| B. | Systems having stability problems |
| C. | Systems having multiple input disturbances |
| D. | All of the above |
| Answer» E. | |
| 540. |
In a stable control system saturation can cause which of the following ? |
| A. | Low-level oscillations |
| B. | High-level oscillations |
| C. | Conditional stability |
| D. | Overdamping |
| Answer» D. Overdamping | |
| 541. |
The term backlash is associated with |
| A. | servomotors |
| B. | induction relays |
| C. | gear trains |
| D. | any of the above |
| Answer» D. any of the above | |
| 542. |
an be extended to systems which are time-varying ? |
| A. | Bode-Nyquist stability methods |
| B. | Transfer functions |
| C. | Root locus design |
| D. | State model representatives |
| Answer» E. | |
| 543. |
As a result of introduction of negative feedback which of the following will not decrease? |
| A. | Band width |
| B. | Overall gain |
| C. | Distortion |
| D. | Instability |
| Answer» B. Overall gain | |
| 544. |
In a system low friction coefficient facilitates |
| A. | Reduced velocity lag error |
| B. | Increased velocity lag error |
| C. | Increased speed of response |
| D. | Reduced time constant of the system |
| Answer» B. Increased velocity lag error | |
| 545. |
In a system zero initial condition means that |
| A. | The system is at rest and no energy is stored in any of its components |
| B. | The system is working with zero stored energy |
| C. | The system is working with zero reference signal |
| D. | None of the above |
| Answer» B. The system is working with zero stored energy | |
| 546. |
Which of the following statements is correct for any closed loop system ? |
| A. | All the co-efficients can have zero value |
| B. | All the co-efficients are always non-zero |
| C. | Only one of the static error co-efficients has a finite non-zero value |
| D. | None of the above |
| Answer» D. None of the above | |
| 547. |
Addition of zeros in transfer function causes which of the following? |
| A. | Lead-compensation |
| B. | Lag-compensation |
| C. | Lead-lag compensation |
| D. | None of the above |
| Answer» C. Lead-lag compensation | |
| 548. |
The type-2 system has ________ at the origin. |
| A. | No net pole |
| B. | Net pole |
| C. | Simple pole |
| D. | Two poles |
| Answer» E. | |
| 549. |
By which of the following the control action is determined when a man walks along a path? |
| A. | Brain |
| B. | Hands |
| C. | Legs |
| D. | Eyes |
| Answer» E. | |
| 550. |
The first order control system, which is well designed, has a |
| A. | small bandwidth |
| B. | negative time constant |
| C. | large negative transfer function pole |
| D. | none of the above |
| Answer» D. none of the above | |