MCQOPTIONS
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MCQOPTIONS
This section includes 102 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
_______________is a closed loop system? |
| A. | Auto-pilot for an aircraft |
| B. | Direct current generator |
| C. | Car starter |
| D. | Electric switch |
| Answer» B. Direct current generator | |
| 2. |
A car is raining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ? |
| A. | Clutch |
| B. | Eyes |
| C. | Needle of the speedometer |
| D. | Steering wheel |
| E. | None of the above |
| Answer» D. Steering wheel | |
| 3. |
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 | |
| 4. |
A closed loop system is distinguished from open loop system by which of the following ? |
| A. | Servomechanism |
| B. | Feedback |
| C. | Output pattern |
| D. | Input pattern |
| Answer» C. Output pattern | |
| 5. |
With feedback __________ increases? |
| A. | system stability |
| B. | sensitivity |
| C. | gain |
| D. | effects of disturbing signals |
| Answer» B. sensitivity | |
| 6. |
In an open loop control system____________? |
| A. | Output is independent of control input |
| B. | Output is dependent on control input |
| C. | Only system parameters have effect on the control output |
| D. | None of the above |
| Answer» B. Output is dependent on control input | |
| 7. |
A good control system has all the following features except_____________? |
| A. | good stability |
| B. | slow response |
| C. | good accuracy |
| D. | sufficient power handling capacity |
| Answer» C. good accuracy | |
| 8. |
The initial response when tne 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 | |
| 9. |
Which of the following is an open loop control system ? |
| A. | Field controlled D.C. motor |
| B. | Ward leonard control |
| C. | Metadyne |
| D. | Stroboscope |
| Answer» B. Ward leonard control | |
| 10. |
has tendency to oscillate______________? |
| A. | Open loop system |
| B. | Closed loop system |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. and B. | |
| 11. |
increases the steady state accuracy? |
| A. | Integrator |
| B. | Differentiator |
| C. | Phase lead compensator |
| D. | Phase lag compensator |
| Answer» B. Differentiator | |
| 12. |
The transient response, with feedback system_____________? |
| A. | rises slowly |
| B. | rises quickly |
| C. | decays slowly |
| D. | decays quickly |
| Answer» E. | |
| 13. |
Which of the following statements is not necessarily correct for open control system ? |
| A. | Input command is the sole factor responsible for providing the control action |
| B. | Presence of non-linearities causes malfunctioning |
| C. | Less expensive |
| D. | Generally free from problems of non-linearities |
| Answer» C. Less expensive | |
| 14. |
The second derivative input signals modify which of the following ? |
| A. | The time constant of the system |
| B. | Damping of the system |
| C. | The gain of the system |
| D. | The time constant and suppress the oscillations |
| E. | None of the above |
| Answer» E. None of the above | |
| 15. |
A control system in which the control action is somehow dependent on the output is known as____________? |
| A. | Closed loop system |
| B. | Semiclosed loop system |
| C. | Open system |
| D. | None of the above |
| Answer» B. Semiclosed loop system | |
| 16. |
Which of the following statements is correct for any closed loop system ? |
| A. | All the co-efficients can have zero value |
| B. | All the co-efficients are always non-zero |
| C. | Only one of the static error co-efficients has a finite non-zero value |
| D. | None of the above |
| Answer» D. None of the above | |
| 17. |
Which of the following statements is correct for a system with gain margin close to unity 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 | |
| 18. |
A controller, essentially, is a________________? |
| A. | sensor |
| B. | clipper |
| C. | comparator |
| D. | amplifier |
| Answer» D. amplifier | |
| 19. |
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 | |
| 20. |
In a control system the output of the controller is given to_____________? |
| A. | final control element |
| B. | amplifier |
| C. | comparator |
| D. | sensor |
| E. | none of the above |
| Answer» B. amplifier | |
| 21. |
In a stable control system backlash can cause which of the following ? |
| A. | Underdamping |
| B. | Overdamping |
| C. | Poor stability at reduced values of open loop gain |
| D. | Low-level oscillations |
| Answer» E. | |
| 22. |
Due to which of the following reasons excessive bond width in control systems should be 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 | |
| 23. |
The band width, in a feedback amplifier_______________? |
| A. | remains unaffected |
| B. | decreases by the same amount as the gain increase |
| C. | increases by the sane saaaajajt as the gain decrease |
| D. | decreases by the same amount as the gain decrease |
| Answer» D. decreases by the same amount as the gain decrease | |
| 24. |
A control system with excessive noise, is likely to suffer from_______________? |
| A. | saturation in amplifying stages |
| B. | loss of gain |
| C. | vibrations |
| D. | oscillations |
| Answer» B. loss of gain | |
| 25. |
_______________is an open loop control system? |
| A. | Ward Leonard control |
| B. | Field controlled D.C. motor |
| C. | Stroboscope |
| D. | Metadyne |
| Answer» C. Stroboscope | |
| 26. |
Transfer function of a system is used to calculate which of the following ? |
| A. | The order of the system |
| B. | The time constant |
| C. | The output for any given input |
| D. | The steady state gain |
| Answer» D. The steady state gain | |
| 27. |
Zero initial condition for a system means_______________? |
| A. | input reference signal is zero |
| B. | zero stored energy |
| C. | an initial movement of moving parts |
| D. | system is at rest and no energy is stored in any of its components |
| Answer» E. | |
| 28. |
A.C. servomotor resembles_____________? |
| A. | two phase induction motor |
| B. | Three phase induction motor |
| C. | direct current series motor |
| D. | universal motor |
| Answer» B. Three phase induction motor | |
| 29. |
____________is a part of the human temperature control system? |
| A. | Digestive system |
| B. | Perspiration system |
| C. | Ear |
| D. | Leg movement |
| Answer» C. Ear | |
| 30. |
The output of a feedback control system must be a function of_________________? |
| A. | reference and output |
| B. | reference and input |
| C. | input and feedback signal |
| D. | output and feedback signal |
| Answer» B. reference and input | |
| 31. |
Any externally introduced signal affecting the controlled output is called a______________? |
| A. | feedback |
| B. | stimulus |
| C. | signal |
| D. | gain control |
| Answer» C. signal | |
| 32. |
In closed loop control system, with positive value of feedback gain the overall gain of the system will______________? |
| A. | decrease |
| B. | increase |
| C. | be unaffected |
| D. | any of the above |
| Answer» B. increase | |
| 33. |
With feed back __________ reduces? |
| A. | system stability |
| B. | system gain |
| C. | system stability and gain |
| D. | none of the above |
| Answer» C. system stability and gain | |
| 34. |
An automatic toaster is a ___________ loop control system? |
| A. | open |
| B. | closed |
| C. | partially closed |
| D. | any of the above |
| Answer» B. closed | |
| 35. |
For open control system which of the following statements is incorrect ? |
| A. | Less expensive |
| B. | Recalibration is not required for maintaining the required quality of the output |
| C. | Construction is simple and maintenance easy |
| D. | Errors are caused by disturbances |
| Answer» C. Construction is simple and maintenance easy | |
| 36. |
Which of the following should be done to make an unstable system stable ? |
| A. | The gain of the system should be decreased |
| B. | The gain of the system should be increased |
| C. | The number of poles to the loop transfer function should be increased |
| D. | The number of zeros to the loop transfer function should be increased |
| Answer» C. The number of poles to the loop transfer function should be increased | |
| 37. |
In open loop system_____________? |
| A. | the control action depends on the size of the system |
| B. | the control action depends on system variables |
| C. | the control action depends on the input signal |
| D. | the control action is independent of the output |
| Answer» E. | |
| 38. |
Which of the following devices are commonly used as error detectors in instruments ? |
| A. | Vernistats |
| B. | Microsyns |
| C. | Resolvers |
| D. | Any of the above |
| Answer» E. | |
| 39. |
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. | |
| 40. |
Regenerative feedback implies feedback with_______________? |
| A. | oscillations |
| B. | step input |
| C. | negative sign |
| D. | positive sign |
| Answer» E. | |
| 41. |
On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ? |
| A. | Frequency |
| B. | Loop gain |
| C. | Forward gain |
| D. | All of the above |
| Answer» E. | |
| 42. |
In an automatic control system which of the following elements is not used ? |
| A. | Error detector |
| B. | Final control element |
| C. | Sensor |
| D. | Oscillator |
| Answer» E. | |
| 43. |
A control system working under unknown random actions is called______________? |
| A. | computer control system |
| B. | digital data system |
| C. | stochastic control system |
| D. | adaptive control system |
| Answer» D. adaptive control system | |
| 44. |
technique gives quick transient and stability response______________? |
| A. | Root locus |
| B. | Bode |
| C. | Nyquist |
| D. | Nichols |
| Answer» B. Bode | |
| 45. |
If the gain of the critical damped system is increased it will behave as______________? |
| A. | oscillatory |
| B. | critically damped |
| C. | overdamped |
| D. | underdamped |
| E. | none of the above |
| Answer» E. none of the above | |
| 46. |
The transfer function technique is considered as inadequate under which of the following conditions ? |
| A. | Systems having complexities and non-linearities |
| B. | Systems having stability problems |
| C. | Systems having multiple input disturbances |
| D. | All of the above |
| Answer» E. | |
| 47. |
An amplidyne can give which of the following characteristics ? |
| A. | Constant current |
| B. | Constant voltage |
| C. | Constant current as well as constant voltage |
| D. | Constant current, constant voltage and constant power |
| E. | None of the above |
| Answer» E. None of the above | |
| 48. |
A differentiator is usually not a part of a control system because it______________? |
| A. | reduces damping |
| B. | reduces the gain margin |
| C. | increases input noise |
| D. | increases error |
| Answer» D. increases error | |
| 49. |
_____________is not a final control element? |
| A. | Control valve |
| B. | Potentiometer |
| C. | Electropneumatic converter |
| D. | Servomotor |
| Answer» C. Electropneumatic converter | |
| 50. |
Pressure error can be measured by which of the following ? |
| A. | Differential bellows and straingauge |
| B. | Selsyn |
| C. | Strain gauge |
| D. | Strain gauge and potentiometer |
| Answer» B. Selsyn | |