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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.
| 6551. |
For the system of the given figure, the undamped natural frequency of closed loop poles is |
| A. | 2 rad/sec |
| B. | 1 rad/sec |
| C. | 0.5 rad/sec |
| D. | 0.25 rad/sec |
| Answer» B. 1 rad/sec | |
| 6552. |
In the given figure |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-291-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-291-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-291-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-291-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-291-2.png"> | |
| 6553. |
In the given figure the input frequency f = 10(1/2 p RC) |
| A. | 0 dB |
| B. | 3 dB |
| C. | -3 dB |
| D. | -20 dB |
| Answer» E. | |
| 6554. |
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 | |
| 6555. |
If G(s) H(s) = , the closed loop poles are on |
| A. | negative real axis |
| B. | <i>j</i> |
| C. | axis |
| D. | right half plane |
| E. | either (a) or (b) |
| Answer» C. axis | |
| 6556. |
For the given figure C(s)/R(s) |
| A. | K |
| B. | 0.5 K |
| C. | 2 K |
| D. | 0.25 K |
| Answer» C. 2 K | |
| 6557. |
For the second order system damping ratio is |
| A. | 0.1 |
| B. | 0.25 |
| C. | 0.333 |
| D. | 0.5 |
| Answer» E. | |
| 6558. |
Modelling error may occur due to |
| A. | neglecting the nonlinear characteristics of plant |
| B. | inaccuracy of parameters |
| C. | change of plant characteristics with time |
| D. | any of the above |
| Answer» E. | |
| 6559. |
In the given figure, P = 3 kg force. Then X(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-49-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-49-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-49-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-49-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-49-4.png"> | |
| 6560. |
In position control system the device used for providing rate feedback voltage is |
| A. | potentiometer |
| B. | synchro-transmitter |
| C. | synchro-transformer |
| D. | tacho generator |
| Answer» E. | |
| 6561. |
A system has 12 poles and 2 zeros. Its high frequency asymptote in its magnitude plot has a slope of |
| A. | -200 dB/decade |
| B. | -240 dB/decade |
| C. | -280 dB/decade |
| D. | -320 dB/decade |
| Answer» B. -240 dB/decade | |
| 6562. |
The phase angle curve of G(j ) H(j ) can be drawn |
| A. | by adding the phase angle curves of individual factors |
| B. | by subtracting the phase angle curves of individual factors |
| C. | by multiplying the phase angle curves of individual factors |
| D. | by dividing the phase angle curves of individual factors |
| Answer» B. by subtracting the phase angle curves of individual factors | |
| 6563. |
The most commonly used devices for differencing and amplification, in control systems, are |
| A. | BJT amplifiers |
| B. | FET amplifiers |
| C. | operational amplifiers |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 6564. |
For the feedback system with closed loop transfer function the settling time for 2% tolerance |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-265-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-265-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/28-265-3.png"> |
| D. | 4 |
| E. | <sub><i>n</i></sub> |
| Answer» D. 4 | |
| 6565. |
In a second order system with a unit step input, the speed of response is high if system is |
| A. | overdamped |
| B. | undamped system |
| C. | critically damped |
| D. | underdamped |
| Answer» E. | |
| 6566. |
A thermometer requires 1 minute to indicate 98% of its final response to a step input. If it is a first order system the time constant is |
| A. | 1 minute |
| B. | 0.5 minute |
| C. | 0.25 minute |
| D. | 0.1 minute |
| Answer» D. 0.1 minute | |
| 6567. |
The system in the given figure, x(0) = 0 and x (0) = 0, At t = 0 the unit impulse (t) is applied X(s) |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-43-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-43-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-43-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-43-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-43-4.png"> | |
| 6568. |
If 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 | |
| 6569. |
For the block diagram of in the given figure, the transfer function C(s)/R(s) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/12-19-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/12-19-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/12-19-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/12-19-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/12-19-3.png"> | |
| 6570. |
Which of the following rotors are used in two phase ac servomotor? Solid iron rotorSquirrel cage rotorDrag cup rotor Of the above the correct ones are |
| A. | 1, 2, 3 |
| B. | 1, 2 |
| C. | 2, 3 |
| D. | 1, 3 |
| Answer» D. 1, 3 | |
| 6571. |
For the system of given figure the closed loop transfer function |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-58-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-58-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-58-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-58-4.png"> |
| Answer» E. | |
| 6572. |
For the system in the given figure, the ratio C(s)/R(s) = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-221-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-221-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-221-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-221-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-221-2.png"> | |
| 6573. |
The transfer function can be for |
| A. | lead compensator |
| B. | lag compensator |
| C. | both (a) and (b) |
| D. | either (a) or (b) |
| Answer» C. both (a) and (b) | |
| 6574. |
In Bode method of stability analysis, the error curve is not symmetric about corner frequency. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6575. |
Given figure shows a unity feedback system. The ratio of time constants for open loop and closed loop response are |
| A. | 1 : 1 |
| B. | 2 : 1 |
| C. | 3 : 2 |
| D. | 2 : 3 |
| Answer» E. | |
| 6576. |
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. | |
| 6577. |
In a second order system n = 10 rad/sec and = 0.1, then d = |
| A. | 9.1 rad/sec |
| B. | 9.95 rad/sec |
| C. | 9 rad/sec |
| D. | 1 rad/sec |
| Answer» C. 9 rad/sec | |
| 6578. |
Derivative control action is effective? |
| A. | Only during steady state periods |
| B. | Only during transient state periods |
| C. | During both steady state and transient state periods |
| D. | Either during steady state or during transient state periods |
| Answer» C. During both steady state and transient state periods | |
| 6579. |
The response is |
| A. | undamped |
| B. | underdamped |
| C. | critically damped |
| D. | oscillatory |
| Answer» C. critically damped | |
| 6580. |
A second order system has damping ratio x and natural frequency n. The unit step response is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-51-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-51-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-51-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-51-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/14-51-4.png"> | |
| 6581. |
For the given figure, |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/33-358-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/33-358-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/33-358-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/33-358-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/33-358-3.png"> | |
| 6582. |
A system has .If x(t) = t2, Y(s) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-42-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-42-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-42-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-42-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/13-42-4.png"> | |
| 6583. |
In the given figure, R2 >> R1. Then |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/32-330-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/32-330-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/32-330-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/32-330-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/32-330-2.png"> | |
| 6584. |
Which of the following is not a necessary advantage of negative feedback system? |
| A. | Feedback improves speed of response |
| B. | Feedback improves stability |
| C. | Feedback reduces effect of variations in system parameters |
| D. | Feedback reduces the effect of external disturbances |
| Answer» C. Feedback reduces effect of variations in system parameters | |
| 6585. |
The auto correlation of a sampling function is a |
| A. | triangular function |
| B. | gate function |
| C. | signum function |
| D. | none of the above |
| Answer» C. signum function | |
| 6586. |
If a linear time invartant system is exicited by a pure random signal like white noise, the output of the linear system will have which of the following properties? |
| A. | Output will be a white noise |
| B. | Output will be periodic |
| C. | Output will be random |
| D. | Output will be correlated or coloured noise |
| Answer» D. Output will be correlated or coloured noise | |
| 6587. |
The enery E associated with time function f(t) is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-198-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-198-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-198-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-198-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-198-3.png"> | |
| 6588. |
Give that is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-164-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-164-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-164-3.png"> |
| D. | None of these |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/13-164-3.png"> | |
| 6589. |
In the periodic train of rectangular pulses F0 = (V0/T)d |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6590. |
If f(t) F(j ), and f(t) is real, then |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-200-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-200-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-200-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-200-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/14-200-3.png"> | |
| 6591. |
The F.T. of e-pf2 is e-pf2 then Fourier Transform of e -at2 is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/24-400-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/24-400-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/24-400-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/24-400-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/signals-and-systems/24-400-3.png"> | |
| 6592. |
For the unity feed back system of the given figure, the closed loop transfer function is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-299-3.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-298-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-298-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-299-1.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/30-298-2.png"> | |
| 6593. |
The effect of negative feedback on distortion and bandwidth because |
| A. | both are decreased |
| B. | both are increased |
| C. | distortion is reduced and bandwidth is increased |
| D. | distortion is increased and bandwidth is decreased |
| Answer» D. distortion is increased and bandwidth is decreased | |
| 6594. |
For an ac sinusoidal wave, the rms value is 10 A. For the same wave delayed by 60 in each half cycle, the rms value is likely to be |
| A. | 10 A |
| B. | 7.07 A |
| C. | 6.35 A |
| D. | 3.5 A |
| Answer» B. 7.07 A | |
| 6595. |
It f(t) is an odd function, the coefficients Fn in the exponential form of Fourier series |
| A. | are real |
| B. | are imaginary |
| C. | are complex |
| D. | may be real or imaginary |
| Answer» C. are complex | |
| 6596. |
In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to |
| A. | facilitate tracking |
| B. | allow permit adequate frequency coverage without switching |
| C. | facilitate image frequency rejection |
| D. | all of the above |
| Answer» C. facilitate image frequency rejection | |
| 6597. |
The sensitivity of a superheterodyne receiver is determined by |
| A. | the gain IF amplifier |
| B. | the gain of RF amplifier |
| C. | the noise figure |
| D. | all of the above |
| Answer» E. | |
| 6598. |
A padder is basically a/an |
| A. | insulator |
| B. | variable resistor |
| C. | capacitor |
| D. | inductor |
| Answer» D. inductor | |
| 6599. |
When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is |
| A. | 555 kHz |
| B. | 1010 kHz |
| C. | 1465 kHz |
| D. | 1920 kHz |
| Answer» D. 1920 kHz | |
| 6600. |
In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be |
| A. | 1010 kHz |
| B. | 1455 kHz |
| C. | 1910 kHz |
| D. | 545 kHz |
| Answer» D. 545 kHz | |