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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.
| 6451. |
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 | |
| 6452. |
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 | |
| 6453. |
In case of synchro error detector the electrical zero position of control transformer is obtained when angular displacement between rotors is |
| A. | zero |
| B. | 45 |
| C. | 90 |
| D. | 180 |
| Answer» D. 180 | |
| 6454. |
The system in the given figure |
| A. | will be unstable due to the presence of positive feedback in the inner loop |
| B. | may be stabilized by the negative feedback outer loop |
| C. | can never be stable |
| D. | will always be stable |
| Answer» C. can never be stable | |
| 6455. |
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 | |
| 6456. |
Assertion (A): In the given figure open loop transfer function = Reason (R): The ratio is called feed forward transfer 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 | |
| 6457. |
When time constant T in any factor is varied, the shapes of log magnitude and phase angle curves remain the same. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6458. |
Which of the following is not correct for two phase servomotor? |
| A. | Rotor diameter is small |
| B. | Applied voltages are seldom balanced |
| C. | Rotor resistance is low |
| D. | Torque speed curve is linear |
| Answer» D. Torque speed curve is linear | |
| 6459. |
DC servomotors are, generally |
| A. | permanent magnet dc motors |
| B. | shunt field motors |
| C. | separately excited dc motors |
| D. | none of the above |
| Answer» B. shunt field motors | |
| 6460. |
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 | |
| 6461. |
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. | 1/41 |
| D. | 1/40 |
| Answer» D. 1/40 | |
| 6462. |
In Bode diagram (log magnitude plot) of the factor 1/(1 + j T) in the transfer function the log magnitude for << 1/T can be approximated by |
| A. | 0 dB |
| B. | 20 log T dB |
| C. | -20 log T dB |
| D. | none of the above |
| Answer» B. 20 log T dB | |
| 6463. |
The phase angle of is constant and equal to - 90 for all values of |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6464. |
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 | |
| 6465. |
For underdamped second order systems the rise time is the time required for the response to rise from |
| A. | 0% to 100% of its final value |
| B. | 10% to 90% of its final value |
| C. | 5% to 95% of its final value |
| D. | either (a) or (b) |
| Answer» B. 10% to 90% of its final value | |
| 6466. |
The open loop frequency response of a unity feed back system is as underThe gain margin and phase margin respectively are |
| A. | 20 dB and 15 |
| B. | 20 dB and 25 |
| C. | 6 dB and 15 |
| D. | 6 dB and 25 |
| Answer» D. 6 dB and 25 | |
| 6467. |
Assertion (A): A large negative feedback is deliberately introduced in an amplifier to make its gain independent of variation in parameters of active device.Reason (R): A large negative value of feedback results in a high value of return difference compared to unity which makes the feedback gain inversely proportional to the feedback factor. |
| 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 | |
| 6468. |
A motor is coupled to a load through gear ratio n. If T is the motor torque, Jm and JL are moment of inertia of rotor and load, then torque to inertia ratio referred to motor shaft is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-44-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-44-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-44-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-44-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-44-4.png"> | |
| 6469. |
Accurate amplitude measurements can be made more easily than accurate phase shift measurements. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6470. |
A synchro transmitter receiver unit is a |
| A. | two phase ac device |
| B. | 3 phase ac device |
| C. | dc device |
| D. | 1 phase ac device |
| Answer» E. | |
| 6471. |
In the given figure the input frequency f = 0.1 (1/2 p RC) |
| A. | 0 dB |
| B. | 3 dB |
| C. | -3 dB |
| D. | 20 dB |
| Answer» B. 3 dB | |
| 6472. |
Assertion (A): Feedback control systems offer more accurate control than open loop systems.Reason (R): The feedback path establishes a link for comparison of input and output and subsequent error correction. |
| 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 | |
| 6473. |
Examine the following statements Pneumatic systems are fire proof.Pneumatic systems are explosion proof.Hydraulic systems are explosion proof.Hydraulic systems are fire proof. Which of the above statements are correct? |
| A. | 1 only |
| B. | 1 and 2 only |
| C. | 1 2, 3, 4 |
| D. | 2, 3, 4 only |
| Answer» C. 1 2, 3, 4 | |
| 6474. |
For the given figure the equation of motion is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-52-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-52-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-52-3.png"> |
| D. | none of the above |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-52-2.png"> | |
| 6475. |
The addition of a zero to the open loop transfer function |
| A. | pulls the root locus to the left and makes the system more stable |
| B. | pulls the root locus to the right and makes the system less stable |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. pulls the root locus to the right and makes the system less stable | |
| 6476. |
Integral error compensation changes a second order system to |
| A. | first order system |
| B. | third order system |
| C. | fourth order system |
| D. | either (a) or (b) depending on the system |
| Answer» C. fourth order system | |
| 6477. |
Assertion (A): If integral control action is included in the controller the offset can be eliminated.Reason (R): Integral control action may lead to oscillatory response. |
| 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 | |
| 6478. |
If the breakaway and break in points in the root locus are located at |
| A. | -2 and -1 |
| B. | -2.47 and -3.77 |
| C. | -4.27 and -7.73 |
| D. | none of the above |
| Answer» D. none of the above | |
| 6479. |
An ac tachometer has a drag cup construction so that |
| A. | rotor inertia is low |
| B. | rotor body is conducting |
| C. | rotor is easy to fabricate |
| D. | both (a) and (b) |
| Answer» E. | |
| 6480. |
The constant M loci on G(s) plane are a family of circles. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6481. |
Assertion (A): For an underdamped system with damping ratio , the maximum overshoot is e- p/(1- 2)0.5Reason (R): Peak time of a second order under damped system = p/ d where d is frequency of damped oscillations. |
| 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 | |
| 6482. |
For the given figure, the transfer function of signal flow graph is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/20-163-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/20-163-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/20-163-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/20-163-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/20-163-2.png"> | |
| 6483. |
I-PD controlled system has |
| A. | I, P and D actions in forward path |
| B. | I, P and D actions in feedback path |
| C. | I action in forward path but P and D action in feedback path |
| D. | I action in feedback path but P and D actioins in forward path |
| Answer» D. I action in feedback path but P and D actioins in forward path | |
| 6484. |
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 | |
| 6485. |
The ac motor used in servo applications is |
| A. | single phase induction motor |
| B. | two phase induction motor |
| C. | 3 phase induction motor |
| D. | synchronous motor |
| Answer» C. 3 phase induction motor | |
| 6486. |
For the log magnitude Bode plot of the given figure, the transfer function is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-244-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-244-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-244-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-244-4.png"> |
| Answer» E. | |
| 6487. |
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. | |
| 6488. |
For the equation where Q is heat energy, Ct is thermal capacitance and is temperature, the analogous electrical equation is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-9-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-9-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-9-3.png"> |
| D. | none of the above |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/11-9-2.png"> | |
| 6489. |
In a synchro transmitter, which coil acts as primary? |
| A. | Rotor |
| B. | Stator |
| C. | Partly rotor and partly stator |
| D. | Tertiary |
| Answer» B. Stator | |
| 6490. |
Assertion (A): The transient performance of a control system is generally analysed by using unit step function as reference input.Reason (R): Impulse is the most common input found in practice. |
| 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 | |
| 6491. |
Assertion (A): The function has a double pole at s = - 5.Reason (R): If the function [G(s)] (s + p)n for n = 1, 2, 3 ... has a finite non-zero value at s = - p, then s = - p is called a pole of order n. |
| 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 | |
| 6492. |
The static equation of a system is The poles of this system are located at |
| A. | -1, -9 |
| B. | -1, -20 |
| C. | -4, -5 |
| D. | -9, -20 |
| Answer» D. -9, -20 | |
| 6493. |
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 | |
| 6494. |
Assertion (A): A synchro control transformer has nearly constant impedance across its rotor terminals.Reason (R): Rotor of a synchro control transformer is cylindrical so as to give uniform flux distribution. |
| 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 | |
| 6495. |
The log magnitude plot of the given figure is for |
| A. | type 0 system |
| B. | type 1 system |
| C. | type 2 system |
| D. | either type 0 or type 1 system |
| Answer» B. type 1 system | |
| 6496. |
The shape of torque-speed curve of a two phase servo- motor mostly depends on |
| A. | ratio of rotor reactance to rotor resistance |
| B. | ratio of stator reactance to rotor resistance |
| C. | ratio of rotor reactance to rotor resistance and also the ratio of stator reactance to stator resistance |
| D. | magnitude of stator voltages |
| Answer» B. ratio of stator reactance to rotor resistance | |
| 6497. |
In a lag network the input frequency is 100 fc where fc is critical frequency. The voltage gain is |
| A. | 0 dB |
| B. | -20 dB |
| C. | -40 dB |
| D. | -60 dB |
| Answer» D. -60 dB | |
| 6498. |
Assertion (A): Temperature control of the passenger compartment of car uses both feed forward and feedback controls.Reason (R): Feed forward control gives corrective action before the disturbance affects the output and feedback control applies corrective action after output changes. |
| 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 | |
| 6499. |
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 | |
| 6500. |
The correct sequence of events to improve system stability is |
| A. | insert derivative action, use negative feedback, reduce gain |
| B. | reduce gain, use negative feedback, insert derivative action |
| C. | reduce gain, insert derivative feedback, use negative feed back |
| D. | use negative feedback, reduce gain, insert derivative action |
| Answer» E. | |