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.
| 1. |
The type 2 system has ______ at the origin. |
| A. | no net pole |
| B. | net pole |
| C. | simple pole |
| D. | two poles |
| Answer» E. | |
| 2. |
specified ________ input signal. |
| A. | acceleration |
| B. | velocity |
| C. | position |
| D. | all of the above |
| Answer» E. | |
| 3. |
as |
| A. | disturbance |
| B. | command |
| C. | control element |
| D. | reference input |
| Answer» B. command | |
| 4. |
load disturbances depend ? |
| A. | frequency |
| B. | loop gain |
| C. | forward gain |
| D. | all of the above |
| Answer» E. | |
| 5. |
As a result of introduction of negative feedback which of the following will not decrease ? |
| A. | band width |
| B. | overall gain |
| C. | distortion |
| D. | instability |
| Answer» B. overall gain | |
| 6. |
By which of the following the control action is determined when a man walks along a path ? |
| A. | brain |
| B. | hands |
| C. | legs |
| D. | eyes |
| Answer» E. | |
| 7. |
A control system in which the control action is somehow dependent on the output isknown as |
| A. | Closed loop system |
| B. | Semiclosed loop system |
| C. | Open system |
| D. | None of the above |
| Answer» B. Semiclosed loop system | |
| 8. |
Which of the following is the best method for determining the stability and transientresponse ? |
| A. | Root locus |
| B. | Bode plot |
| C. | Nyquist plot |
| D. | None of the above |
| Answer» B. Bode plot | |
| 9. |
By which of the following the control action is determined when a man walks along apath ? |
| A. | Brain |
| B. | Hands |
| C. | Legs |
| D. | Eyes |
| Answer» E. | |
| 10. |
Velocity error constant of a system is measured when the input to the system is unit_______ function. |
| A. | parabolic |
| B. | ramp |
| C. | impulse |
| D. | step |
| Answer» C. impulse | |
| 11. |
The transfer function technique is considered as inadequate under which of thefollowing conditions ? |
| A. | Systems having complexities and non-linearities |
| B. | Systems having stability problems |
| C. | Systems having multiple input dis¬turbances |
| D. | All of the above |
| Answer» E. | |
| 12. |
As a result of introduction of negative feedback which of the following will notdecrease ? |
| A. | Band width |
| B. | Overall gain |
| C. | Distortion |
| D. | Instability |
| Answer» B. Overall gain | |
| 13. |
The phase lag produced by transportation relays |
| A. | is independent of frequency |
| B. | is inverseh'proportional to frequency |
| C. | increases linearly with frequency |
| D. | decreases linearly with frequency |
| Answer» D. decreases linearly with frequency | |
| 14. |
can be extended to systems which are time-varying ? |
| A. | Bode-Nyquist stability methods |
| B. | Transfer functions |
| C. | Root locus design |
| D. | State model representatives |
| Answer» E. | |
| 15. |
Static error co-efficients are used as a measure of the effectiveness of closed loopsystems for specified ________ input signal. |
| A. | acceleration |
| B. | velocity |
| C. | position |
| D. | all of the above |
| Answer» E. | |
| 16. |
If a step function is applied to the input of a system and the output remains below acertain level for all the time, the system is |
| A. | not necessarily stable |
| B. | stable |
| C. | unstable |
| D. | always unstable |
| Answer» B. stable | |
| 17. |
Which of the following can be measured by the use of a tacho-generator ? |
| A. | Acceleration |
| B. | Speed |
| C. | Speed and acceleration |
| D. | Displacement |
| Answer» C. Speed and acceleration | |
| 18. |
The type 1 system has ______ at the origin. |
| A. | no pole |
| B. | net pole |
| C. | simple pole |
| D. | two poles |
| Answer» D. two poles | |
| 19. |
On which of the following factors does the sensitivity of a closed loop system to gainchanges and load disturbances depend ? |
| A. | Frequency |
| B. | Loop gain |
| C. | Forward gain |
| D. | All of the above |
| Answer» E. | |
| 20. |
The temperature, under thermal and electrical system analogy, is consideredanalogous to |
| A. | voltage |
| B. | current |
| C. | capacitance |
| D. | charge |
| Answer» B. current | |
| 21. |
When the initial conditions of a system are specified to be zero it implies that thesystem is |
| A. | at rest without any energy stored in it |
| B. | working normally with reference input |
| C. | working normally with zero reference input |
| D. | at rest but stores energy |
| Answer» E. | |
| 22. |
Which of the following statements is correct for a system with gain margin close tounity or a phase margin close to zero ? |
| A. | The system is relatively stable |
| B. | The system is highly stable |
| C. | The system is highly oscillatory |
| D. | None of the above |
| Answer» D. None of the above | |
| 23. |
Which of the following can be measured byLVDT? |
| A. | Displacement |
| B. | Velocity |
| C. | Acceleration |
| D. | Any of the above |
| Answer» E. | |
| 24. |
The initial response when the output is not equal to input is called |
| A. | Transient response |
| B. | Error response |
| C. | Dynamic response |
| D. | Either of the above |
| Answer» B. Error response | |
| 25. |
In closed loop control system, with positive value of feedback gain the overall gain ofthe system will |
| A. | decrease |
| B. | increase |
| C. | be unaffected |
| D. | any of the above |
| Answer» B. increase | |
| 26. |
In order to increase the damping of a badly underdamped system which of followingcompensators may be used ? |
| A. | Phase-lead |
| B. | Phase-lag |
| C. | Both (a) and (b) |
| D. | Either (a) and (b) |
| Answer» B. Phase-lag | |
| 27. |
Addition of zeros in transfer function causes which of the following ? |
| A. | Lead-compensation |
| B. | Lag-compensation |
| C. | Lead-lag compensation |
| D. | None of the above |
| Answer» C. Lead-lag compensation | |
| 28. |
Which of the following is the output of a thermocouple ? |
| A. | Alternating current |
| B. | Direct current |
| C. | A.C. voltage |
| D. | D.C. voltage |
| Answer» E. | |
| 29. |
A car is running at a constant speed of 50 km/h, which of the following is the feedbackelement for the driver ? |
| A. | Clutch |
| B. | Eyes |
| C. | Needle of the speedometer |
| D. | Steering wheel |
| Answer» D. Steering wheel | |
| 30. |
Due to which of the following reasons excessive bond width in control systems shouldbe avoided ? |
| A. | It leads to slow speed of response |
| B. | It leads to low relative stability |
| C. | Noise is proportional to band width |
| D. | None of the above |
| Answer» D. None of the above | |
| 31. |
A signal other than the reference input that tends to affect the value of controlledvariable is known as |
| A. | disturbance |
| B. | command |
| C. | control element |
| D. | reference input |
| Answer» B. command | |
| 32. |
The planet pinion carrier and shaft are used in which type of gear? |
| A. | Rack and pinion |
| B. | Internal Gears |
| C. | Spur Gears |
| D. | Helical Gears |
| Answer» C. Spur Gears | |
| 33. |
Bevel gears are used for ____ |
| A. | Transmitting power between intersecting shafts |
| B. | Converting rotary into translatory motion |
| C. | For high speed and high load applications |
| D. | Used in high capacity reduction driver like cement mills |
| Answer» B. Converting rotary into translatory motion | |
| 34. |
Which type of gear is used to convert rotary into translatory motion? |
| A. | Spur gear |
| B. | Rack and pinion |
| C. | Helical gear |
| D. | Internal gear |
| Answer» C. Helical gear | |
| 35. |
In which type of gear teethes are parallel to the axis? |
| A. | Spur Gears |
| B. | Helical Gears |
| C. | Rack and pinion |
| D. | Internal Gears |
| Answer» B. Helical Gears | |
| 36. |
When the gear is driven, it results in step down driven in which the output speed decreases and torque increases. |
| A. | True |
| B. | False |
| Answer» C. | |
| 37. |
In any pair of gear, the smaller one is called as the pinion and the larger one is called as ____ |
| A. | Gear immaterial |
| B. | Spur Gear |
| C. | Internal gear |
| D. | Helical gear |
| Answer» B. Spur Gear | |
| 38. |
Which type of damper works on the principle of the magnetic field? |
| A. | Linear dashpot |
| B. | Rotary dashpot |
| C. | Eddy current damper |
| D. | Shock absorbers |
| Answer» D. Shock absorbers | |
| 39. |
Dashpot absorbs energy from an object. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 40. |
Force applied by dashpot is proportional to the velocity of an object in ____ |
| A. | Same direction |
| B. | Opposite direction |
| C. | All directions |
| D. | Upward and Downward direction |
| Answer» C. All directions | |
| 41. |
What are Dashpots? |
| A. | It works as a damper which resists motion by viscous friction |
| B. | Toothed parts which transfer power between two shafts |
| C. | Used to transmit power between two parallel shafts |
| D. | Convert the rotatory motion into translatory motion |
| Answer» B. Toothed parts which transfer power between two shafts | |
| 42. |
In position control systems, the Tacho-generator feedback is used to |
| A. | Increase the effective damping in the system |
| B. | Decrease the effective damping in the system |
| C. | Decrease the steady-state error |
| D. | Increase the steady-state error |
| Answer» B. Decrease the effective damping in the system | |
| 43. |
In an automobile driving system, brain of the driver acts as |
| A. | error detector |
| B. | integrating block |
| C. | summing block |
| D. | actuator |
| Answer» B. integrating block | |
| 44. |
In a closed loop control system |
| A. | control action depends on the output and also on the input command |
| B. | output signal as feedback to be compared with the reference signal |
| C. | accuracy is better than in open loop system |
| D. | All of these |
| Answer» E. | |
| 45. |
Direction: The following item consists of two statements, one labelled as ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the code given below:Statement I: Open-loop system is inaccurate and unreliable due to internal disturbances and lack of adequate calibration.Statement II: Closed-loop system is inaccurate as it cannot account environmental or parametric changes and may become unstable. |
| A. | Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I |
| B. | Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I |
| C. | Statement I is true but Statement II is false |
| D. | Statement I is false but Statement II is true |
| Answer» D. Statement I is false but Statement II is true | |
| 46. |
Positive feedback in a system |
| A. | increases the system error |
| B. | increases the gain of the system in one frequency range |
| C. | increases the gain of the system in one frequency range but decreases in another |
| D. | makes originally stable system to become more unstable |
| Answer» E. | |
| 47. |
Directions: It consists of two statements, one labelled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I):Servo motors have small diameter and large axial length.Statement (II):Servo motors must have low inertia and high starting torque. |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» B. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I) | |
| 48. |
For a negative feedback system shown in Figure,the equivalent transfer function is: |
| A. | \(\frac {s^3 + 5s^2 + 6s}{s^3 + 7s^2 + 12s + 3}\) |
| B. | \(\frac {s^3 + 5s^2 + 6s}{s^3 + 5s^2 + 4s - 3}\) |
| C. | \(\frac {s^2 + 5s + 4}{s^3 + 7s^2 + 12s + 3}\) |
| D. | \(\frac {s^2 + 5s + 4}{s^3 + 5s^2 + 4s - 3}\) |
| Answer» D. \(\frac {s^2 + 5s + 4}{s^3 + 5s^2 + 4s - 3}\) | |
| 49. |
An Op-Amp has the following open-loop parameters Zin = 300 kΩ, Zout = 100 Ω, A = 50,000. The low-frequency system input and output impedances, when the closed-loop gain is set to 100, are |
| A. | 0.6 Ω and 50 k Ω |
| B. | 150 M Ω and 0.2 Ω |
| C. | Same as in open loop |
| D. | None of the above |
| Answer» C. Same as in open loop | |
| 50. |
If the input signal x(t) and impulse response h(t) of a continuous-time system are described asx(t) =e-3t u(t) and h(t) = u(t – 1), the output y(t) will be |
| A. | \(\frac{1}{3}\left[ {1 - {e^{ - 3\left( {t - 1} \right)}}} \right]\)u(t - 1) |
| B. | \(\frac{1}{3}\left[ {1 - {e^{ - 3t\;}}} \right]\)u(t - 1) |
| C. | \(\frac{1}{3}\left[ {1 + {e^{ - 3\left( {t - 1} \right)}}} \right]\)u(t - 1) |
| D. | \(\frac{1}{3}\left[ {1 + {e^{ - 3t}}} \right]\)u(t - 1) |
| Answer» B. \(\frac{1}{3}\left[ {1 - {e^{ - 3t\;}}} \right]\)u(t - 1) | |