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.
| 451. |
For the circuit in the given figure, V2(s)/V1(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 452. |
The system in the given figure, has |
| A. | good gain and phase margin |
| B. | poor gain and phase margin |
| C. | good gain margin but poor phase margin |
| D. | poor gain margin but good phase margin |
| Answer» E. | |
| 453. |
For the system in the given figure, C(s)/R(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 454. |
The given figure shows a pole zero diagram. The transfer function G(j1) is |
| A. | 0.5 ∠0 |
| B. | 2.7 ∠- 31° |
| C. | 2 ∠45° |
| D. | 2 ∠- 67.4° |
| Answer» B. 2.7 ∠- 31° | |
| 455. |
Consider the following statements:The gain margin and phase margin of an unstable system may respectively be 1. positive, positive2. positive, negative3. negative, positive4. negative, negative Of these statements |
| A. | 1, 4 are correct |
| B. | 1 and 2 correct |
| C. | 1, 2, 3 are correct |
| D. | 2, 3, 4 are correct |
| Answer» E. | |
| 456. |
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 | |
| 457. |
The slope of log magnitude curve near the cut off frequency is called cut off rate. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 458. |
If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 459. |
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 ωT dB | |
| 460. |
When a unit step voltage drives a lag network the output |
| A. | remains constant at unit step value |
| B. | increases exponentially from zero to final value |
| C. | decreases exponentially from 1 to 0 |
| D. | either (b) of (c) depending on values of R and C |
| Answer» C. decreases exponentially from 1 to 0 | |
| 461. |
For a second order system with 0 < ξ < 1, the angle which poles make with negative real axis is |
| A. | sin¯¹ ξ |
| B. | cos¯¹ ξ |
| C. | tan¯¹ ξ |
| D. | cot¯¹ ξ |
| Answer» C. tan¯¹ ξ | |
| 462. |
If the characteristic equation is (λ + 1) (λ + 2) (λ + 3) = 0, the eigen values are |
| A. | -1, -2, -3 |
| B. | 1, 2, 3 |
| C. | 0, 1, 2 |
| D. | 0, 2, 3 |
| Answer» B. 1, 2, 3 | |
| 463. |
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 | |
| 464. |
For the given figure the equation of motion is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 465. |
The damping ratio of a pair of complex poles when expressed in terms of angle θ measured from jω axis equal to |
| A. | sin θ |
| B. | cos θ |
| C. | tan θ |
| D. | cot θ |
| Answer» B. cos θ | |
| 466. |
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 | |
| 467. |
A first order element yields almost exact duplication only for constant or slowly varying phenomenon. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 468. |
PID controlled system has |
| A. | P and I actions in forward path and D action in feedback path |
| B. | P and I actions in feedback path and actions in forward path |
| C. | All the three (i.e., P, I and D) actions in forward path |
| D. | All the three (i.e., P, I and D) actions in feedback path |
| Answer» B. P and I actions in feedback path and actions in forward path | |
| 469. |
In the given figure, R2 >> R1. Then V₂(s)/V₁(s) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 470. |
An open loop system has a forward path transfer function (42.25)/s(s + 6.5). The unit step response of the system starting from rest will have its maximum value at a time equal to |
| A. | 0 sec |
| B. | 0.56 sec |
| C. | 5.6 sec |
| D. | infinity |
| Answer» E. | |
| 471. |
For the system of the given figure the closed loop poles are located at |
| A. | s = 0 and s = -2 |
| B. | s = 0, s = -1 ± j√3 |
| C. | s = -1 ± j√3 |
| D. | s = -2 and s = -1 ± j√3 |
| Answer» D. s = -2 and s = -1 ± j√3 | |
| 472. |
Assertion (A): A slight change in pole-zero configuration can cause only minor changes in root locus configuration.Reason (R): Asymptotes show the behaviour of root loci for |s| >> 1 |
| 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» E. | |
| 473. |
Consider the following statements about variable reluctance stepper motor used in control system 1. The static torque acting on rotor is a function of angular misalignment between stator and rotor teeth2. There are two positions of zero torque i.e, . Q = 0 and 180°/T where T is the number of rotor teeth3. Both zero torque positions are stable4. When stator is excited, rotor is pulled into minimum reluctance position Of these statements, the correct ones are |
| A. | 2, 3, 4 |
| B. | 1, 2, 3 |
| C. | 1, 2, 4 |
| D. | 1, 3, 4 |
| Answer» D. 1, 3, 4 | |
| 474. |
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 | |
| 475. |
For the mechanical system in the given figure the transfer function X(s)/F(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 476. |
A system has given equation. For unit step input the settling time for 2% tolerance band is |
| A. | 1.6 |
| B. | 2.5 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 477. |
The poles of an RC function |
| A. | are simple and lie on jω axis |
| B. | are simple and lie on negative real axis |
| C. | may be complex conjugate |
| D. | may be anywhere in s plane |
| Answer» B. are simple and lie on negative real axis | |
| 478. |
Assertion (A): Most of actual systems are non-linear.Reason (R): Non linearity may be due to saturation, dead zone, square law etc. |
| 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 | |
| 479. |
A FET is a __________ controlled device whereas a bipolar transistor is a __________ controlled device. |
| A. | gate, drain |
| B. | drain, gate |
| C. | current, voltage |
| D. | voltage, current |
| Answer» E. | |
| 480. |
Consider the following statements regarding negative feedback 1. It increases system gain2. It improves sensitivity3. It improves system stability Which of these are not correct? |
| A. | all |
| B. | 1, 2 |
| C. | 1, 3 |
| D. | 1 only |
| Answer» E. | |
| 481. |
In the given figure shows a root locus plot. Consider the following statements for this plot 1. The open loop system is a second order system2. The system is overdamped for K > 13. The system is stable for all values of K Which of the above statements are correct? |
| A. | 1, 2, 3 |
| B. | 1, 3 |
| C. | 2, 3 |
| D. | 1, 2 |
| Answer» C. 2, 3 | |
| 482. |
Consider the following statements: 1. If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.2. If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.3. If one or more non-repeated roots of characteristic equation are on jω axis impulse response is bounded but the system is unstable. Which of the above equations are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2 and 3 only |
| Answer» B. 1 and 2 only | |
| 483. |
The action of bellows is similar to that of |
| A. | mass |
| B. | viscous friction |
| C. | spring |
| D. | none of the above |
| Answer» D. none of the above | |
| 484. |
First column elements of Routh's tabulation are 3, 5, -3/4, 1/2, 2. It means that there |
| A. | is one root in left half s plane |
| B. | are two roots in left half s plane |
| C. | are two roots in right half s plane |
| D. | is one root in right half s plane |
| Answer» D. is one root in right half s plane | |
| 485. |
Power handling capacity of wire wound potentiometer used in control systems is about |
| A. | 0.1 W |
| B. | 5 W |
| C. | 25 W |
| D. | 100 W |
| Answer» C. 25 W | |
| 486. |
The root locus branches |
| A. | start from open loop poles and terminate at zeros |
| B. | start from open loop zeros and terminate at poles |
| C. | may start from pole or zero and terminate at another pole or zero |
| D. | none of the above |
| Answer» B. start from open loop zeros and terminate at poles | |
| 487. |
Assertion (A): When the forward gain of a system is increased, the transient response becomes oscillatory.Reason (R): Increasing the forward gain reduces steady state error. |
| 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 | |
| 488. |
In Bode plots, frequency is plotted on log scale. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 489. |
N circles for α = α1, and α = α1 ± 180° n (where n = 1, 2, 3, ....) are the same. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 490. |
If G(jω) = 1/(1+(jωT) the polar plot, as the frequency is varied from 0 to infinity is |
| A. | a semicircle |
| B. | a circle |
| C. | a straight line |
| D. | none of the above |
| Answer» B. a circle | |
| 491. |
If G(s)H(s) = K/s(s+1)(s²+4s+20), the number of branches of root locus are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 492. |
Coulomb friction is |
| A. | the force of sliding friction between dry surfaces |
| B. | the force of friction between moving surfaces separated by viscous fluid |
| C. | the force required to initiate motion between two contacting surfaces |
| D. | all of the above |
| Answer» B. the force of friction between moving surfaces separated by viscous fluid | |
| 493. |
In classical analogue, torque is analogous to |
| A. | current |
| B. | voltage |
| C. | charge |
| D. | voltage gradient |
| Answer» C. charge | |
| 494. |
A compensator has its pole and zero as shown in the given figure |
| A. | lag compensator |
| B. | lead compensator |
| C. | lead-lag compensator |
| D. | series compensator |
| Answer» C. lead-lag compensator | |
| 495. |
For the following equation, where Q is heat energy Gt is thermal conductance and θ is temperature, analogous electrical equation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 496. |
Assertion (A): The phase angle plot in Bode diagram is not affected by change in system gain.Reason (R): The variation in gain has no effect on phase margin of the system. |
| 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» D. R is correct but A is wrong | |
| 497. |
Examine the following statements 1. Air and gases are compressible.2. Air, gases and some liquids are compressible.3. Oil can function as hydraulic fluid as well as lubricator. Which of the above statements are correct? |
| A. | 3 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 2 only |
| Answer» D. 2 only | |
| 498. |
In an integral controller |
| A. | the output is proportional to input |
| B. | the rate of change of output is proportional to input |
| C. | the output is proportional to rate of change of input |
| D. | none of the above |
| Answer» C. the output is proportional to rate of change of input | |
| 499. |
The compensator in the given figure is a |
| A. | lag compensator |
| B. | lead compensator |
| C. | lag-lead compensator |
| D. | none of the above |
| Answer» D. none of the above | |
| 500. |
For the signal flow graph of the given figure consider the following statements1. It has three forward paths2. It has three individual loops3. It has two non touching loopsOut of above the correct statements are |
| A. | 1, 2, 3 |
| B. | 1, 2 |
| C. | 2, 3 |
| D. | 1, 3 |
| Answer» E. | |