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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.
| 6501. |
A second order system exhibits 100% overshoot. The damping ratio is |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» B. 1 | |
| 6502. |
The log magnitude curve for a constant gain K is a horizontal straight line at a magnitude 20 log K dB. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6503. |
For the plot in the given figure, G(j ) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-369-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-371-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-371-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/34-371-4.png"> |
| Answer» E. | |
| 6504. |
A reactance function |
| A. | has a pole at origin |
| B. | has a zero at origin |
| C. | may have a pole or zero at origin |
| D. | has a pole or zero at origin and a pole or zero at infinity |
| Answer» E. | |
| 6505. |
Transfer functions of even complicated components can be found by frequency response tests. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6506. |
Given figure shows a magnitude Bode plot. The transfer function for this plot is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-262-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-262-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-262-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-262-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-262-4.png"> | |
| 6507. |
An RLC series circuit hasIf poles p1 and p1* are close to j axis, then |
| A. | resonant frequency is high |
| B. | Q is high |
| C. | bandwidth is large |
| D. | Q is low |
| Answer» D. Q is low | |
| 6508. |
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 | |
| 6509. |
For a second order system the damping factor is varied from 0 to 1. The locus of poles is |
| A. | a straight line on imaginary axis |
| B. | a straight line on real axis |
| C. | a semi circle |
| D. | a circle |
| Answer» D. a circle | |
| 6510. |
In force voltage analogy the quantity analogous to spring constant K is |
| A. | R |
| B. | C |
| C. | L |
| D. | 1/C |
| Answer» E. | |
| 6511. |
Time rate of change in heat energy is analogous to |
| A. | voltage |
| B. | charge |
| C. | current |
| D. | voltage gradient |
| Answer» D. voltage gradient | |
| 6512. |
The log magnitude curve of factor j is a straight line having a slope of 20 dB/decade. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6513. |
Optical encoders most commonly used in control systems are |
| A. | absolute encoders |
| B. | secondary encoders |
| C. | incremental encoders |
| D. | none of the above |
| Answer» D. none of the above | |
| 6514. |
Assertion (A): In control system velocity error is not an error in velocity but is an error in position due to a ramp input.Reason (R): For a type of system velocity error is zero. |
| 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 | |
| 6515. |
A conditionally stable system has |
| A. | one phase crossover frequency |
| B. | two phase crossover frequencies |
| C. | two or more phase crossover frequencies |
| D. | one or more phase crossover frequencies |
| Answer» D. one or more phase crossover frequencies | |
| 6516. |
For very low frequencies, log magnitude for the given figure is |
| A. | 0 dB |
| B. | -3 dB |
| C. | 3 dB |
| D. | 10 dB |
| Answer» D. 10 dB | |
| 6517. |
The transfer function can be for |
| A. | lead compensator |
| B. | lag compensator |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. lag compensator | |
| 6518. |
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 | |
| 6519. |
An electromechanical device which actuates a train of step angular movements in response to a train of input pulses on one to one basis is |
| A. | synchro control transformer |
| B. | LVDT |
| C. | stepper motor |
| D. | tacho generator |
| Answer» D. tacho generator | |
| 6520. |
As the bandwidth increases, the cost of components |
| A. | generally decreases |
| B. | generally increases |
| C. | may increase or decrease |
| D. | does not change |
| Answer» C. may increase or decrease | |
| 6521. |
In a pneumatic bellows |
| A. | the input surface, output surface and side walls are corrugated |
| B. | the input surface and output surface are flat but the side walls are corrugated |
| C. | the input surface and side walls are flat but the output surface is corrugated |
| D. | the input surface and output surface are corrugated but the side walls are flat |
| Answer» C. the input surface and side walls are flat but the output surface is corrugated | |
| 6522. |
If , initial and final values of i(t) are |
| A. | zero and 1 |
| B. | zero and 10 |
| C. | 10 and zero |
| D. | 70 and 80 |
| Answer» D. 70 and 80 | |
| 6523. |
For a stable system |
| A. | both phase and gain margin are negative |
| B. | both phase and gain margin are positive |
| C. | phase margin is positive but gain margin is negative |
| D. | gain margin is positive but phase margin is negative |
| Answer» C. phase margin is positive but gain margin is negative | |
| 6524. |
If the angle of departure of root locus at s = - 1 + j is |
| A. | zero |
| B. | 90 |
| C. | -90 |
| D. | -180 |
| Answer» E. | |
| 6525. |
Assertion (A): If the Laplace transform is , the Laplaces transform of impulse response is given by Reason (R): The Laplace transform for an impulse function is 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» B. Both A and R are correct but R is not correct explanation of A | |
| 6526. |
Nichols chart consists of M and N locii in log magnitude versus phase diagram. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6527. |
The polar plot of is the negative imaginary axis. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6528. |
In the given figure, P = Pm sin t. Then X(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-50-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-50-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-50-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-50-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-50-2.png"> | |
| 6529. |
The number of branches of root locus plot is equal to |
| A. | the number of roots of characteristic equation |
| B. | double the number of roots of characteristic equation |
| C. | the number of roots of characteristic equation minus one |
| D. | the number of roots of characteristic equation plus one |
| Answer» B. double the number of roots of characteristic equation | |
| 6530. |
The given figure shows three Nyquist plots of G(s) H(s) = e-sT/[s(s + 1)] for different values of T. The curves 1, 2, 3 can be |
| A. | for T = 0, 0.5 and 1 respectively |
| B. | for T = 1, 0.5 and 0 respectively |
| C. | for T = 0.5, 1 and 0 respectively |
| D. | for T = 0, 1 and 0.5 respectively |
| Answer» B. for T = 1, 0.5 and 0 respectively | |
| 6531. |
The force required to initiate motion between two contacting surfaces is called |
| A. | coulomb friction |
| B. | viscous friction |
| C. | static friction |
| D. | none of the above |
| Answer» D. none of the above | |
| 6532. |
One advantage of using polar plot is that it depicts the frequency response characteristics over the entire frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6533. |
Assertion (A): Derivative control action cannot be used alone.Reason (R): Derivative control action is effective only during transient periods. |
| 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 | |
| 6534. |
The slope of log magnitude curve near the cut off frequency is called cut off rate. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6535. |
Consider the following statements:The gain margin and phase margin of an unstable system may respectively be positive, positivepositive, negativenegative, positivenegative, 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. | |
| 6536. |
A first order element yields almost exact duplication only for constant or slowly varying phenomenon. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6537. |
The gain margin of first and second order systems is infinite. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6538. |
Assertion (A): The concept of impulse function is useful in differentiating discontinuous functions.Reason (R): |
| 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 | |
| 6539. |
The gain margin for a stable system |
| A. | has a positive decibel value |
| B. | has a negative decibel value |
| C. | has a large negative decibel value |
| D. | none of the above |
| Answer» B. has a negative decibel value | |
| 6540. |
For overdamped systems a quadratic factor in transfer function can be replaced by two first order factors with real poles |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6541. |
If a number of even 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» B. odd funtion | |
| 6542. |
Assertion (A): The time response of the system with will not have any overshoot for unit step input.Reason (R): A critically damped system does not have any overshoot to a unit step input. |
| 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 | |
| 6543. |
FIR filter Passes __________ Phase. |
| A. | non-linear phase |
| B. | linear phase |
| C. | variable phase |
| D. | none |
| Answer» B. linear phase | |
| 6544. |
A trigonometric series has |
| A. | single sided spectra |
| B. | zero |
| C. | sync function |
| D. | undefined |
| Answer» B. zero | |
| 6545. |
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 | |
| 6546. |
If a signal g(t) has energy E, then the energy of the signal g(2t) is equal to ... |
| A. | E/2 |
| B. | E/4 |
| C. | <i>E</i> |
| D. | 2E |
| Answer» B. E/4 | |
| 6547. |
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. | |
| 6548. |
Which of the following can be used as a rotating amplifier in a control system? AmplidyneSeparately excited dc generatorSynchroSelf excited dc generator Select the answer from the following codes: |
| A. | 3 and 4 |
| B. | 1 and 2 |
| C. | 1, 2 and 3 |
| D. | all |
| Answer» C. 1, 2 and 3 | |
| 6549. |
A lead compensator |
| A. | speeds up the transient response |
| B. | increases the stability margin |
| C. | increases the stability margin and speeds up the transient-response. |
| D. | none of the above. |
| Answer» D. none of the above. | |
| 6550. |
In a second order undamped system, the poles are on |
| A. | positive real axis |
| B. | imaginary axis |
| C. | negative real axis |
| D. | either (a) or (c) |
| Answer» C. negative real axis | |