MCQOPTIONS
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MCQOPTIONS
This section includes 283 Mcqs, each offering curated multiple-choice questions to sharpen your Control Systems knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
An ON OFF controller is a |
| A. | P controller |
| B. | integral controller |
| C. | non-linear controller |
| D. | PID controller |
| Answer» D. PID controller | |
| 252. |
An effect of phase-lag compensation on servo system performance is that |
| A. | for a given relative stability, the velocity constant is increased |
| B. | for a given relative stability, the velocity constant is decreased |
| C. | the bandwidth of the system is increased |
| D. | the time response is made faster |
| Answer» B. for a given relative stability, the velocity constant is decreased | |
| 253. |
The minimum number of states necessary to describe the network shown in the figure in a state variable form is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 254. |
Given a unity feedback system with open-loop transfer function. |
| A. | Fig:- A |
| B. | Fig:- B |
| C. | Fig:- C |
| D. | Fig:- D |
| Answer» B. Fig:- B | |
| 255. |
The polar plot of a type-1, 3-pole, open-loop system is shown in figure. The closedloop system is |
| A. | always stable |
| B. | marginally stable |
| C. | unstable with one pole on the right half s-plane |
| D. | unstable with two poles on the right half s-plane |
| Answer» D. unstable with two poles on the right half s-plane | |
| 256. |
A linear discrete-time system has the characteristic equation, z |
| A. | is stable |
| B. | is marginally stable |
| C. | is unstable |
| D. | stability cannot be assessed from the given information. |
| Answer» B. is marginally stable | |
| 257. |
Which of the following is the transfer function of a system having the Nyquist plot in figure below? |
| A. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K</center></td></tr><tr><td style="text-align: center;">s(s + 2)<sup>2</sup>(s + 5)</td></tr></table> |
| B. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K</center></td></tr><tr><td style="text-align: center;">s<sup>2</sup>(s + 2)(s + 5)</td></tr></table> |
| C. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 1)</center></td></tr><tr><td style="text-align: center;">s<sup>2</sup>(s + 2)(s + 5)</td></tr></table> |
| D. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 1)(s + 3)</center></td></tr><tr><td style="text-align: center;">s<sup>2</sup>(s + 2)(s + 5)</td></tr></table> |
| Answer» C. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 1)</center></td></tr><tr><td style="text-align: center;">s<sup>2</sup>(s + 2)(s + 5)</td></tr></table> | |
| 258. |
A system is described by X = [] 0 1 2 3 X + [] 0 1 u y = [1 0] X The system is |
| A. | controllable and observable |
| B. | uncontrollable and observable |
| C. | controllable and unobservable |
| D. | uncontrollable and unobservable |
| Answer» B. uncontrollable and observable | |
| 259. |
A lag compensation network |
| A. | All |
| B. | (i) and (ii) |
| C. | (ii), (iii) and (iv) |
| D. | (iii) and (ii) |
| Answer» B. (i) and (ii) | |
| 260. |
The log-magnitude plot of a system is given below. |
| A. | integrator |
| B. | PID controller |
| C. | PD controller |
| D. | proportional controller |
| Answer» C. PD controller | |
| 261. |
Which one of the following is an example of open-loop system? |
| A. | A windscreen wiper |
| B. | Respiratory system of an animal |
| C. | A system for controlling anti-rocket missiles. |
| D. | None of these |
| Answer» B. Respiratory system of an animal | |
| 262. |
A plant has the following transfer function: |
| A. | 20 sec |
| B. | 40 sec |
| C. | 35 sec |
| D. | 45 sec |
| Answer» C. 35 sec | |
| 263. |
Consider the vectors drawn form the poles and zeros at j = 1 on the imaginary axis as shown in the given figure. The transfer function G (j1) is given by |
| A. | 1/2 0 |
| B. | 2.7 31 |
| C. | 2 45 |
| D. | 2 67.4 |
| Answer» B. 2.7 31 | |
| 264. |
In the following pick out the time-invariant systems. |
| A. | (i) and (iii) |
| B. | (i) and (ii) |
| C. | (ii) and (iii) |
| D. | (i) only |
| Answer» B. (i) and (ii) | |
| 265. |
In the following, pick out the non-linear systems |
| A. | (i) and (iii) |
| B. | (ii) and (iii) |
| C. | (i) and (ii) |
| D. | None of these |
| Answer» B. (ii) and (iii) | |
| 266. |
The transfer function of a phase lead controller is (1 + 3Ts)/ (1 + Ts). The maximum value of phase provided by this controller is |
| A. | 90 |
| B. | 60 |
| C. | 45 |
| D. | 30 |
| Answer» E. | |
| 267. |
In a synchronous error detector, the output voltage is proportional to [ (t)]n where (t) is the rotor velocity and n equals to |
| A. | 2 |
| B. | 1 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 268. |
If stability error for step input and speed of response be the criterion for design, what controller would you recommend? |
| A. | P controller |
| B. | PD controller |
| C. | PI controller |
| D. | PID controller |
| Answer» E. | |
| 269. |
In the following, pick out the linear systems. |
| A. | (i) and (ii) |
| B. | (i) only |
| C. | (i) and (iii) |
| D. | (ii) and (iii) |
| Answer» D. (ii) and (iii) | |
| 270. |
In the Bode-plot of a unit feedback control system, the value of phase of G (j ) at the gain crossover frequency is 125 . The phase margin of the system is |
| A. | 125 |
| B. | 55 |
| C. | 55 |
| D. | 125 |
| Answer» D. 125 | |
| 271. |
The block diagram shown below is equivalent to |
| A. | Fig:- A |
| B. | Fig:- B |
| C. | Fig:- C |
| D. | Fig:- D |
| Answer» C. Fig:- C | |
| 272. |
A second order system with no zeros has its poles located at 3 + j4 and 3 j4 in the s-plane. The undamped natural frequency and the damping factor of the system are respectively |
| A. | 4 rad/sec and 0.75 |
| B. | 3 rad/sec and 0.60 |
| C. | 5 rad/sec and 0.80 |
| D. | 5 rad/sec and 0.60 |
| Answer» B. 3 rad/sec and 0.60 | |
| 273. |
The transfer function is 1 + 0 5s/1 + s. It represents a |
| A. | lead network |
| B. | lag network |
| C. | lag-lead network |
| D. | proportional controller |
| Answer» C. lag-lead network | |
| 274. |
For a gain constant K, the phase-lead compensator |
| A. | reduces the slope of the magnitude curve in the entire range of frequency domain |
| B. | decreases the gain cross-over frequency |
| C. | reduce the phase margin |
| D. | reduces the resonance peak, M |
| E. | <sub>p</sub> |
| Answer» B. decreases the gain cross-over frequency | |
| 275. |
Which input yields natural response? |
| A. | ac input |
| B. | dc input |
| C. | impulse input |
| D. | a ramp input |
| Answer» D. a ramp input | |
| 276. |
The type of a transfer function denotes the number of |
| A. | Poles at origin |
| B. | Zeros at origin |
| C. | Finite poles |
| D. | Poles at infinity |
| Answer» B. Zeros at origin | |
| 277. |
Sinusoidal oscillator are |
| A. | stable |
| B. | marginally stable |
| C. | unstable |
| D. | conditionally stable |
| Answer» C. unstable | |
| 278. |
A minimum-phase system with no zeros has a phase angle of 270 at gain crossover frequency. The system is |
| A. | stable |
| B. | unstable |
| C. | marginally stable |
| D. | conditionally stable |
| Answer» C. marginally stable | |
| 279. |
G (s) =1s(1 + 6s) |
| A. | stable |
| B. | unstable |
| C. | marginally stable |
| D. | conditionally stable |
| Answer» D. conditionally stable | |
| 280. |
A linear second-order system with the transfer function |
| A. | 16% |
| B. | 9% |
| C. | 2% |
| D. | zero |
| Answer» D. zero | |
| 281. |
When two identical first order systems have been cascaded non-interactively. The unit step response of the systems will be |
| A. | overdamped |
| B. | underdamped |
| C. | undamped |
| D. | critically damped |
| Answer» E. | |
| 282. |
The transfer function of the system |
| A. | Stable |
| B. | Unstable |
| C. | Conditionally stable |
| D. | Marginally stable |
| Answer» C. Conditionally stable | |
| 283. |
It is given that |
| A. | 2 and 3 |
| B. | 3 and 2 |
| C. | 3 and 3 |
| D. | 2 and 2 |
| Answer» C. 3 and 3 | |