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.
| 251. |
If C is thermal capacitance, m is mass of liquid and c is specific heat, then |
| A. | C = mc |
| B. | c = mC |
| C. | m = cC |
| D. | C = (mc)² |
| Answer» B. c = mC | |
| 252. |
For a type 1 system and unit step input, the steady state error is |
| A. | 0 |
| B. | 1 |
| C. | 1/(1+Kp) |
| D. | ∞ |
| Answer» B. 1 | |
| 253. |
Assertion (A): For a given system only one of the static error constants is finite and significant.Reason (R): If finite static error constant is large, the loop gain becomes smaller as ω approaches zero. |
| 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 | |
| 254. |
For any test point s on the real axis, the sum of angular contributions of the complex conjugate poles is |
| A. | 90° |
| B. | 180° |
| C. | 270° |
| D. | 360° |
| Answer» E. | |
| 255. |
Examine the following statements 1. Pneumatic systems are fire proof.2. Pneumatic systems are explosion proof.3. Hydraulic systems are explosion proof.4. 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 | |
| 256. |
In Bode diagrams an octave is a frequency band from |
| A. | ω₁ to 10 ω₁ |
| B. | ω₁ to 8 ω₁ |
| C. | ω₁ to 4 ω₁ |
| D. | ω₁ to 2 ω₁ |
| Answer» E. | |
| 257. |
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° | |
| 258. |
Consider the following statements relating to synchros1. Rotor of control transformer is either disc shaped or umbrella shaped2. Rotor of transmitter has low magnetic reluctance3. Transmitter and control transformer pair act as error detector Out of above the correct statements are |
| A. | 1, 2, 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 259. |
The following two functions have |
| A. | identical magnitude and phase curves |
| B. | identical magnitude curves but different phase curves |
| C. | different magnitude curves but identical phase curves |
| D. | different magnitude and phase curves |
| Answer» C. different magnitude curves but identical phase curves | |
| 260. |
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 | |
| 261. |
The given figure shows log magnitude versus ω plots of a system for different values of gain. For this system |
| A. | curve 1 shows highest gain margin and curve 2 shows poorest gain margin |
| B. | gain margins shown by the three curves are equal |
| C. | curve 1 shows poorest gain margin and curve 3 shows highest gain margin |
| D. | curve 3 shows poorest gain margin while curve 1 shows highest gain margin |
| Answer» D. curve 3 shows poorest gain margin while curve 1 shows highest gain margin | |
| 262. |
The constant M loci on G(s) plane are a family of circles. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 263. |
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 | |
| 264. |
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 | |
| 265. |
Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions. Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by jω |
| 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. | |
| 266. |
For type 2 system, the magnitude and phase angle of the term (jω)² in the denominator, at ω = 0, are respectively |
| A. | 0 and - 90° |
| B. | 0 and + 90° |
| C. | infinity and - 180° |
| D. | infinity and + 180° |
| Answer» D. infinity and + 180° | |
| 267. |
For an unstable system the gain margin is indicative of how much the gain should be decreased to make the system stable. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 268. |
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 | |
| 269. |
The signal flow graph of a system is shown in the given figure. The effect of disturbance TD can be reduced by |
| A. | increasing G2 (s) |
| B. | decreasing G2 (s) |
| C. | increasing G1 (s) |
| D. | decreasing G1 (s) |
| Answer» D. decreasing G1 (s) | |
| 270. |
The force required to initiate motion between two contacting surfaces is called |
| A. | coulomb friction |
| B. | viscous friction |
| C. | static friction |
| D. | none of the above |
| Answer» D. none of the above | |
| 271. |
For the system of the given figure, the break away and break in points are determined from the conditions dk/ds =0. Then K = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 272. |
If G(s)H(s) is given by following equation, the closed loop pole will be located at s = -12 when K = |
| A. | 4355 |
| B. | 5760 |
| C. | 9600 |
| D. | 9862 |
| Answer» C. 9600 | |
| 273. |
For the factor 1/(1 + 2jω) the corner frequency is |
| A. | 0.5 rad/sec |
| B. | 1 rad/sec |
| C. | 2 rad/sec |
| D. | 4 rad/sec |
| Answer» B. 1 rad/sec | |
| 274. |
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 | |
| 275. |
The phase angle characteristic in the given figure is for |
| A. | all pass function |
| B. | transport lag |
| C. | minimum phase function |
| D. | none of the above |
| Answer» C. minimum phase function | |
| 276. |
For the plot in the given figure, G(jω) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 277. |
In a pneumatic bellows |
| A. | the input surface, output surface and side walls are corrugated |
| B. | the input surface and output surface are flat but the side walls are corrugated |
| C. | the input surface and side walls are flat but the output surface is corrugated |
| D. | the input surface and output surface are corrugated but the side walls are flat |
| Answer» C. the input surface and side walls are flat but the output surface is corrugated | |
| 278. |
In the signal flow graph of the given figure, the number of forward paths is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 279. |
The polar plot of G(jω) = 1/jω is |
| A. | positive imaginary axis |
| B. | positive real axis |
| C. | negative imaginary axis |
| D. | negative real axis |
| Answer» D. negative real axis | |
| 280. |
In the given figure the number of combinations of three non touching loops is |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 281. |
A system has transfer function given by following equation. If a sinusoidal input of frequency ω is applied the steady state output is of the form |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 282. |
The given figure shows three Nyquist plots of G(s) H(s) = e^(-sT)/[s(s + 1)] for different values of T. The curves 1, 2, 3 can be |
| A. | for T = 0, 0.5 and 1 respectively |
| B. | for T = 1, 0.5 and 0 respectively |
| C. | for T = 0.5, 1 and 0 respectively |
| D. | for T = 0, 1 and 0.5 respectively |
| Answer» B. for T = 1, 0.5 and 0 respectively | |
| 283. |
In Bode method of stability analysis, the error curve is not symmetric about corner frequency. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 284. |
A conditionally stable system has |
| A. | one phase crossover frequency |
| B. | two phase crossover frequencies |
| C. | two or more phase crossover frequencies |
| D. | one or more phase crossover frequencies |
| Answer» D. one or more phase crossover frequencies | |
| 285. |
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 | |
| 286. |
For the compensator in the given figure the maximum phase lead is |
| A. | sin¯¹ (1/3) |
| B. | 30° |
| C. | 45° |
| D. | 60° |
| Answer» C. 45° | |
| 287. |
For the following transfer function, the polar plot a is |
| A. | semi circle |
| B. | circle |
| C. | spiral |
| D. | none of the above |
| Answer» D. none of the above | |
| 288. |
Consider the following statements about root locus 1. The intersection of root locus branches with the imaginary axis can be determined by the use of Routh criterion2. Segments of real axis having an odd number of real axis open loop poles plus zeros to their right are not parts of root locus3. The 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 | |
| 289. |
Assertion (A): The time response, usually, is slower with lag compensation. Reason (R): The natural undamped frequency and bandwidth are increased. |
| 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. | |
| 290. |
At corner frequency the phase angle of factor 1/(1 + jωT) is - 45° |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 291. |
The overall transfer function for a unity feedback system is 4/(s² + 4s + 4). Which of the following statements about this system are correct? 1. Position error constant Kp is 42. System is type 13. Velocity error constant is finite Select the answer as per following code: |
| A. | 1, 2, 3 |
| B. | 1, 2 |
| C. | 2, 3 |
| D. | 1, 3 |
| Answer» E. | |
| 292. |
Which of the following rotors are used in two phase ac servomotor? 1. Solid iron rotor2. Squirrel cage rotor3. Drag 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 | |
| 293. |
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. | |
| 294. |
In Bode diagram (log magnitude plot) the factor (jω)^n in the transfer function gives a line having slope |
| A. | 20 dB/decade |
| B. | 20n dB/decade |
| C. | 20/n dB/decade |
| D. | -20n dB/decade |
| Answer» C. 20/n dB/decade | |
| 295. |
In the given figure, P = 3 kg force. Then X(s) = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 296. |
Examine the following statements 1. A small size hydraulic actuator can develop good torque.2. It is easy to maintain a hydraulic system leak proof.3. Both linear and rotatary hydraulic actuators are available.4. Hydraulic power is more easily available than electric power. Which of the above statements are correct? |
| A. | all |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2, 3 and 4 only |
| Answer» D. 2, 3 and 4 only | |
| 297. |
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 | |
| 298. |
The following response is |
| A. | undamped |
| B. | underdamped |
| C. | critically damped |
| D. | oscillatory |
| Answer» C. critically damped | |
| 299. |
In using Nyquist stability criterion it is not necessary to determine closed loop poles. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 300. |
The polar plot of G(jω) = 1/jω is the negative imaginary axis. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |