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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.
| 6301. |
Which control action can never be used alone? |
| A. | Proportional |
| B. | Derivative |
| C. | Integral |
| D. | Both (b) and (c) |
| Answer» C. Integral | |
| 6302. |
In an armature controlled dc motor let J be equivalent moment of inertia of motor and load, f0 be equivalent viscous friction coefficient of motor and load and be angular displacement of motor shaft. Then torque equation is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-287-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-287-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-287-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-287-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/29-287-2.png"> | |
| 6303. |
Which dc servomotor requires strongest permanent magnet? |
| A. | Slotted armature |
| B. | Surface wound armature |
| C. | Surface wound with stationary rotor |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 6304. |
Nichols chart consists of |
| A. | constant magnitude loci |
| B. | constant phase angle loci |
| C. | magnitude and phase angle loci in log-magnitude versus phase diagram |
| D. | none of the above |
| Answer» D. none of the above | |
| 6305. |
Consider the following statements about root locus The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterionSegments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locusThe number of root locus branches terminating on infinity is always zero Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 1 only |
| D. | 2 and 3 only |
| Answer» C. 1 only | |
| 6306. |
In the signal flow graph in the given figure the number of forward paths and pairs of non-touching loops are respectively |
| A. | 3 and 1 |
| B. | 3 and 2 |
| C. | 4 and 2 |
| D. | 2 and 4 |
| Answer» B. 3 and 2 | |
| 6307. |
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 | |
| 6308. |
N circles for a = a1, and a = a1 180 n (where n = 1, 2, 3, ....) are the same. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6309. |
If G(s)H(s) = K (T1s + 1)/[s2 (T2s + 1)] the system stability depended an relative magnitudes of T1 and T2. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6310. |
In a simple on-off controller with differential gap, the magnitude of differential gap determines |
| A. | the level of accuracy |
| B. | the life of controller |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 6311. |
For a feedback systemThen the velocity error constant Kv is given by |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-261-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-261-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-261-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-261-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/27-261-2.png"> | |
| 6312. |
Which of the following is open loop system? |
| A. | Wind screen wiper |
| B. | Aqualing |
| C. | Respiratory system of animal |
| D. | System for controlling antirocket missiles |
| Answer» B. Aqualing | |
| 6313. |
For type 0 system the starting point (i.e. = 0) of polar plot is finite and is on positive real axis. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6314. |
If poles lie in first quadrant, damping ratio is |
| A. | 1 |
| B. | more than 1 |
| C. | less than 1 |
| D. | zero |
| Answer» D. zero | |
| 6315. |
Consider following statements: Integral of absolute magnitude of error = Integral time-absolute error = Integral time-square error = Which of the above are correct? |
| A. | 1 and 3 |
| B. | 1 only |
| C. | 1 and 2 |
| D. | 2 and 3 |
| Answer» D. 2 and 3 | |
| 6316. |
For a stable system having two or more gain crossover frequencies the phase margin is measured at the highest crossover frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6317. |
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6318. |
In a two phase servomotor the two stator windings have a phase difference of |
| A. | 30 |
| B. | 45 |
| C. | 90 |
| D. | 135 |
| Answer» D. 135 | |
| 6319. |
Nichol's chart is symmetric about - 180 axis. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6320. |
In Bode plots the frequency at which two asymptotes meet is called corner frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6321. |
For a type 1 system and unit step input, the steady state error is |
| A. | 0 |
| B. | 1 |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/12-31-3.png"> |
| D. | |
| Answer» B. 1 | |
| 6322. |
In Bode plots, frequency is plotted on log scale. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6323. |
A system has two poles as shown in the given figure. The zeros are at infinity. If input is unit step, the steady state output is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-243-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-243-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/26-243-3.png"> |
| D. | 1 |
| Answer» E. | |
| 6324. |
The radius and centre of M circles are given by |
| A. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-224-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-224-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-224-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-224-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/automatic-control-systems/25-224-2.png"> | |
| 6325. |
A unity feedback system has the following open loop frequency responseThe gain margin and phase margin are |
| A. | 0 dB, -17 |
| B. | 3.86 dB, -180 |
| C. | 0 dB, 10 |
| D. | 3.86 dB, 10 |
| Answer» E. | |
| 6326. |
The effect of adding poles and zeros can be determined quickly by |
| A. | Nichols chart |
| B. | Nyquist plot |
| C. | Bode plot |
| D. | Root locus |
| Answer» D. Root locus | |
| 6327. |
In force current analogue, mechanical mobility is analogous to |
| A. | impedance Z |
| B. | admittance Y |
| C. | reactance X |
| D. | conductance G |
| Answer» B. admittance Y | |
| 6328. |
If any term in the first column of a Routh array becomes zero, then |
| A. | Routh criterion cannot be used to determine stability |
| B. | Routh criterion can be used by substituting a small positive number for zero and completing the array |
| C. | Routh criterion can be used by substituting a big positive number for zero and completing the array |
| D. | Routh criterion can be used by substituting a small negative number for zero and completing the array |
| Answer» C. Routh criterion can be used by substituting a big positive number for zero and completing the array | |
| 6329. |
The polar plot of |
| A. | does not cross real axis |
| B. | crosses real axis once |
| C. | crosses real axis 2 times |
| D. | crosses real axis 4 times |
| Answer» B. crosses real axis once | |
| 6330. |
For the factor (1 + 0.5 j ) the corner frequency is |
| A. | 1 rad/sec |
| B. | 0.5 rad/sec |
| C. | 2 rad/sec |
| D. | 0.25 rad/sec |
| Answer» D. 0.25 rad/sec | |
| 6331. |
The block diagram of the given figure for |
| A. | On-off controller |
| B. | On-off controller with differential gap |
| C. | On-off controller with integral gap |
| D. | Three position controller |
| Answer» B. On-off controller with differential gap | |
| 6332. |
In a two phasor servomotor, the direction of rotation of the rotating field depends on |
| A. | magnitudes of voltages applied to the two stator windings |
| B. | phase relation of voltages applied to the two stator windings |
| C. | both magnitude and phase relationship of voltages applied to the two stator windings |
| D. | none of the above |
| Answer» C. both magnitude and phase relationship of voltages applied to the two stator windings | |
| 6333. |
Assertion (A): Points in the s plane at which function G(s) is not analytic are called singular, points.Reason (R): Singular points at which the function G(s) or its derivative approach infinity are called poles. |
| 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 | |
| 6334. |
The permanent magnet field system of brushless dc servo- motor is generally on |
| A. | stator |
| B. | rotor |
| C. | partly on stator and partly on rotor |
| D. | either (a) or (b) |
| Answer» C. partly on stator and partly on rotor | |
| 6335. |
In force current analogy, displacement x is analogous to |
| A. | charge |
| B. | magnetic flux linkage |
| C. | electrostatic energy |
| D. | voltage |
| Answer» C. electrostatic energy | |
| 6336. |
Consider the following statements about variable reluctance stepper motor used in control system The static torque acting on rotor is a function of angular misalignment between stator and rotor teethThere are two positions of zero torque i.e, . Q = 0 and where T is the number of rotor teethBoth zero torque positions are stableWhen 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 | |
| 6337. |
For the system in the given figure, the gain margin is |
| A. | 0 |
| B. | low |
| C. | + |
| D. | none of the above |
| Answer» D. none of the above | |
| 6338. |
For any transfer function, the constant phase angle loci are |
| A. | a family of circles |
| B. | a family of straight lines |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. a family of straight lines | |
| 6339. |
Consider the following statements about root locus The root locus is symmetrical about real axis.If a root locus branch moves along the real axis from an open loop pole to zero or to infinity, this root locus branch is called real root branch.The breakaway points of the root locus are the solutions of Which statements out of above are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 1, 2 and 3 |
| D. | 2 and 3 only |
| Answer» D. 2 and 3 only | |
| 6340. |
At corner frequency the phase angle of factor is - 45 |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6341. |
For an m x n matrix A, the eigen values are the roots of the characteristic equation |
| A. | |I - A| |
| B. | | I - A| = 0 |
| C. | | A - I| = 0 |
| D. | |A - I| = 0 |
| Answer» C. | A - I| = 0 | |
| 6342. |
If , the number of branches of root locus are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 6343. |
Assertion (A): If f(t) = 1 - e-t, 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» C. A is correct but R is wrong | |
| 6344. |
The system of the given figure |
| A. | is unstable for all values of K |
| B. | is stable for all values of K |
| C. | can be stable for some values of K |
| D. | data is insufficient to determine stability |
| Answer» B. is stable for all values of K | |
| 6345. |
The poles with greater displacement from the real axis correspond to |
| A. | higher frequencies of oscillations |
| B. | stable response |
| C. | lower frequencies of oscillations |
| D. | unbounded output |
| Answer» B. stable response | |
| 6346. |
Consider the following statements: If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.If one or more non-repeated roots of characteristic equation are on j 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 | |
| 6347. |
For a type 1 system and unit parabolic input, the steady state error is |
| A. | 0 |
| B. | |
| C. | 1 |
| D. | 1/K |
| E. | <i><sub>v</sub></i> |
| Answer» C. 1 | |
| 6348. |
In root locus analysis the breakaway and break in points |
| A. | lie on the real axis |
| B. | either lie on the real axis or occur in complex conjugate pairs |
| C. | always occur in complex conjugate pairs |
| D. | none of the above |
| Answer» C. always occur in complex conjugate pairs | |
| 6349. |
In control systems the output of sensor usually, is |
| A. | analog electrical signal |
| B. | digital electrical signal |
| C. | mechanical signal |
| D. | analog or digital electrical signal |
| Answer» E. | |
| 6350. |
Magnetic amplifier is used for |
| A. | voltage amplification |
| B. | power amplification |
| C. | current amplification |
| D. | frequency amplification |
| Answer» C. current amplification | |