MCQOPTIONS
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MCQOPTIONS
This section includes 646 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
A negative feedback system has G(s) = 1/(s+1) and H(s) = K/s(s+2). The closed loop system is stable for |
| A. | K > 20 |
| B. | 15 < K < 19 |
| C. | 8 ≤ K ≤ 14 |
| D. | K < 6 |
| Answer» E. | |
| 202. |
The M circle for M = 1 is the |
| A. | straight line at x = - 0.5 |
| B. | critical point (-l, jo) |
| C. | circle with r = 0.33 |
| D. | circle with r = 0.67 |
| Answer» B. critical point (-l, jo) | |
| 203. |
Assertion (A): When the performance of a stable second order system is improved by a PID controller, the system may become unstable.Reason (R): PID controller increases the order of the system to 3. |
| 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 | |
| 204. |
The constant magnitude of G(s) plane are |
| A. | a family of straight horizontal lines |
| B. | a family of straight inclined lines with positive slope |
| C. | a family of straight inclined lines with negative slope |
| D. | a family of circles |
| Answer» E. | |
| 205. |
For the second order system given by following equation, damping ratio is |
| A. | 0.1 |
| B. | 0.25 |
| C. | 0.333 |
| D. | 0.5 |
| Answer» E. | |
| 206. |
In a mechanical accelerometer, the steady state displacement is a measure of |
| A. | constant input acceleration |
| B. | constant input velocity |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. constant input velocity | |
| 207. |
For the given figure, the transfer function of signal flow graph is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 208. |
For a closed loop system given below. The imaginary axis intercept of the root loci will be |
| A. | ± j 2.8 |
| B. | ± J 0.28 |
| C. | ± j 1.14 |
| D. | ± j 11.4 |
| Answer» B. ± J 0.28 | |
| 209. |
For a first order system having transfer function 1/(1+sT), the unit step response is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 210. |
The radius of constant N circle for N = 1 is |
| A. | 2 |
| B. | √2 |
| C. | 1 |
| D. | 1/√2 |
| Answer» E. | |
| 211. |
If G(s) H(s) = 1/(s²+100), the closed loop poles are on |
| A. | negative real axis |
| B. | jω axis |
| C. | right half plane |
| D. | either (a) or (b) |
| Answer» C. right half plane | |
| 212. |
In a two phase ac servomotor rotor resistance is R and rotor reactance is X. The speed curve will be linear if |
| A. | X/R << 1 |
| B. | X/R >> 1 |
| C. | X/R = 1 |
| D. | X² = R |
| Answer» B. X/R >> 1 | |
| 213. |
In a minimum phase system |
| A. | all poles lie in the left half plane |
| B. | all zeros lie in the left half plane |
| C. | all poles lie in the right half plane |
| D. | all except one pole or zero lie in the left half plane |
| Answer» C. all poles lie in the right half plane | |
| 214. |
For a second order system damping factor is 0.1. If ωd is frequency of damped oscillations and ωn is natural frequency, |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 215. |
In terms of ξ and ωn the settling time (5% criterion) of a second order system for a step input, is equal to |
| A. | 1/ξωn |
| B. | 2/ξωn |
| C. | 3/ξωn |
| D. | 4/ξωn |
| Answer» D. 4/ξωn | |
| 216. |
A system has its two poles on the negative real axis and one pair of poles lies on jω axis. The system is |
| A. | stable |
| B. | unstable |
| C. | limitedly stable |
| D. | either (a) or (c) |
| Answer» D. either (a) or (c) | |
| 217. |
The loop transfer function of a feedback system is given below. The number of asymptotes of its root loci are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 218. |
If feedback factor is β the overall gain of a closed loop system is approximately equal to |
| A. | 1/Avβ |
| B. | 1/β |
| C. | β |
| D. | √β |
| Answer» C. β | |
| 219. |
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. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 220. |
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 | |
| 221. |
The polar plot in the given figure is for the term |
| A. | jωT |
| B. | 1 + jωT |
| C. | 1/jωT |
| D. | 1/(1+jωT) |
| Answer» C. 1/jωT | |
| 222. |
Assertion (A): If the Laplace transform is G(s) = 4/(s²+2s+4), the Laplaces transform of impulse response is given by C(s) = 4/(s²+2s+4)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 | |
| 223. |
For the log magnitude Bode plot of the given figure, the transfer function is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 224. |
For a second order system delay time td is the time required to reach |
| A. | half the final value for the very first time |
| B. | the final value for the very first time |
| C. | 90% of the final value for the very first time |
| D. | none of the above |
| Answer» B. the final value for the very first time | |
| 225. |
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. | |
| 226. |
Bellows converts |
| A. | pressure difference into displacement |
| B. | pressure difference into voltage |
| C. | displacement into pressure difference |
| D. | either (a) or (c) |
| Answer» B. pressure difference into voltage | |
| 227. |
Assertion (A): Positive feedback is not used in any circuit.Reason (R): Positive feedback leads to instability. |
| 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. | |
| 228. |
The open loop transfer function of a system is K/s(Js+F). If the frequency at the intersection of - 40 dB/decade line and 0 dB line is ω, then |
| A. | ω = K/J |
| B. | ω² = K/J |
| C. | ω³ = K/J |
| D. | ω⁴ = K/J |
| Answer» C. ω³ = K/J | |
| 229. |
In force voltage analogy, displacement is analogous to |
| A. | current |
| B. | voltage |
| C. | charge |
| D. | none of the above |
| Answer» D. none of the above | |
| 230. |
In a two phase servomotor, if R is rotor resistance, X is rotor reactance, L is rotor length D is rotor diameter then |
| A. | X/R and L/D are both small |
| B. | X/R is large but L/D is small |
| C. | X/R is small but L/D is large |
| D. | X/R and L/D are both large |
| Answer» D. X/R and L/D are both large | |
| 231. |
The system in the given figure, x(0) = 0 and x (0) = 0, At t = 0 the unit impulse δ(t) is applied X(s) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 232. |
In control systems the word controller includes |
| A. | error detector and feedback element |
| B. | feedback element and control elements |
| C. | error detector and control elements |
| D. | error detector, control elements and feedback elements |
| Answer» D. error detector, control elements and feedback elements | |
| 233. |
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 | |
| 234. |
Mechanical impedance is the ratio of |
| A. | rms force to rms velocity |
| B. | rms force to rms displacement |
| C. | rms velocity to rms displacement |
| D. | none of the above |
| Answer» B. rms force to rms displacement | |
| 235. |
In a synchro transmitter-control transformer, the voltage induced in rotor winding of control transformer is zero when the angular displacement between rotors of transmitter and transformer is |
| A. | 0° |
| B. | 90° |
| C. | 180° |
| D. | either (a) or (c) |
| Answer» C. 180° | |
| 236. |
For the given figure C(s)/R(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 237. |
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 | |
| 238. |
In a synchro transmitter |
| A. | input is angular position of rotor shaft and output is stator voltages |
| B. | input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft |
| C. | input is rotor voltage and output is angular position of rotor shaft |
| D. | input is angular position of rotor shaft and output is rotor voltage |
| Answer» B. input is stator voltages and output is angular position of shaft input is rotor voltage and output is angular position of rotor shaft | |
| 239. |
If G(s)H(s) = K/s²(s²+2s+2), the angle of departure of root locus at s = - 1 + j is |
| A. | zero |
| B. | 90° |
| C. | -90° |
| D. | -180° |
| Answer» E. | |
| 240. |
In log magnitude Bode diagram the slope of high frequency asymptote of (1 + jωT) is |
| A. | 20 dB per decade |
| B. | 10 dB per decade |
| C. | 20 dB per octave |
| D. | 10 dB per octave |
| Answer» B. 10 dB per decade | |
| 241. |
The system matrix of continuous time system described in state variable form is given below. The systems is stable for all values of x and y satisfying |
| A. | x < 1/2, y < 1/2 |
| B. | x > 1/2, y > 0 |
| C. | x < 0, y < 0 |
| D. | x < 0, y < 1/2 |
| Answer» D. x < 0, y < 1/2 | |
| 242. |
The phase difference (jω - p1) means |
| A. | phasor drawn from p1 to jω |
| B. | phasor drawn from origin to p1 |
| C. | phasor directed from origin to jω point |
| D. | phasor directed from jω to p1 |
| Answer» B. phasor drawn from origin to p1 | |
| 243. |
The slope of log magnitude asymptote changes by - 40 dB/ decade at a certain frequency and the error between asymptote and actual curve is - 6 dB. This means that |
| A. | a double pole is present |
| B. | a pair of complex conjugate poles is present |
| C. | either a double pole or a pair of complex conjugate poles is present |
| D. | either a pole or zero at that frequency is present |
| Answer» B. a pair of complex conjugate poles is present | |
| 244. |
At low frequencies the factor e^(-jωT) and 1/(1+jωT) behave simple. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 245. |
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 | |
| 246. |
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. | |
| 247. |
For the following equation, where Q is heat energy, Ct is thermal capacitance and θ is temperature, the analogous electrical equation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 248. |
Lag compensation increases bandwidth of the system. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 249. |
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 | |
| 250. |
Given figure shows a magnitude Bode plot. The transfer function for this plot is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |