McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 1. |
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» A. Output is independent of control input | |
| 2. |
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» B. Recalibration is not required for maintaining the required quality of the output | |
| 3. |
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» A. Closed loop system | |
| 4. |
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» A. decrease | |
| 5. |
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» A. Field controlled D.C. motor | |
| 6. |
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» B. Presence of non-linearities causes malfunctioning | |
| 7. |
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» D. the control action is independent of the output | |
| 8. |
has tendency to oscillate. |
| A. | Open loop system |
| B. | Closed loop system |
| C. | Both a) and b) |
| D. | Neither a) nor b) |
| Answer» B. Closed loop system | |
| 9. |
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» B. slow response | |
| 10. |
A car is running 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 |
| Answer» C. Needle of the speedometer | |
| 11. |
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» A. Transient response | |
| 12. |
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» C. stochastic control system | |
| 13. |
An automatic toaster is a ______ loop control system. |
| A. | open |
| B. | closed |
| C. | partially closed |
| D. | any of the above |
| Answer» A. open | |
| 14. |
Any externally introduced signal affecting the controlled output is called a |
| A. | feedback |
| B. | stimulus |
| C. | signal |
| D. | gain control |
| Answer» B. stimulus | |
| 15. |
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» B. Feedback | |
| 16. |
is a part of the human temperature control system. |
| A. | Digestive system |
| B. | Perspiration system |
| C. | Ear |
| D. | Leg movement |
| Answer» B. Perspiration system | |
| 17. |
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» D. Eyes | |
| 18. |
is a closed loop system. |
| A. | Auto-pilot for an aircraft |
| B. | Direct current generator |
| C. | Car starter |
| D. | Electric switch |
| Answer» A. Auto-pilot for an aircraft | |
| 19. |
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» D. Any of the above | |
| 20. |
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» B. The gain of the system should be increased | |
| 21. |
increases the steady state accuracy. |
| A. | Integrator |
| B. | Differentiator |
| C. | Phase lead compensator |
| D. | Phase lag compensator |
| Answer» A. Integrator | |
| 22. |
A.C. servomotor resembles |
| A. | two phase induction motor |
| B. | Three phase induction motor |
| C. | direct current series motor |
| D. | universal motor |
| Answer» A. two phase induction motor | |
| 23. |
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» A. Band width | |
| 24. |
Regenerative feedback implies feedback with |
| A. | oscillations |
| B. | step input |
| C. | negative sign |
| D. | positive sign |
| Answer» D. positive sign | |
| 25. |
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» A. reference and output | |
| 26. |
is an open loop control system. |
| A. | Ward Leonard control |
| B. | Field controlled D.C. motor |
| C. | Stroboscope |
| D. | Metadyne |
| Answer» B. Field controlled D.C. motor | |
| 27. |
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» A. saturation in amplifying stages | |
| 28. |
Zero initial condition for a system means |
| A. | input reference signal is zero |
| B. | zero stored energy |
| C. | ne initial movement of moving parts |
| D. | system is at rest and no energy is stored in any of its components |
| Answer» D. system is at rest and no energy is stored in any of its components | |
| 29. |
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» C. The output for any given input | |
| 30. |
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» C. increases by the sane saaaajajt as the gain decrease | |
| 31. |
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» D. All of the above | |
| 32. |
The transient response, with feedback system, |
| A. | rises slowly |
| B. | rises quickly |
| C. | decays slowly |
| D. | decays quickly |
| Answer» D. decays quickly | |
| 33. |
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 |
| Answer» D. The time constant and suppress the oscillations | |
| 34. |
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» C. Only one of the static error co-efficients has a finite non-zero value | |
| 35. |
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» C. The system is highly oscillatory | |
| 36. |
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» C. Noise is proportional to band width | |
| 37. |
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» D. Low-level oscillations | |
| 38. |
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» D. Oscillator | |
| 39. |
In a control system the output of the controller is given to |
| A. | final control element |
| B. | amplifier |
| C. | comparator |
| D. | sensor |
| Answer» A. final control element | |
| 40. |
A controller, essentially, is a |
| A. | sensor |
| B. | clipper |
| C. | comparator |
| D. | amplifier |
| Answer» C. comparator | |
| 41. |
The capacitance, in force-current analogy, is analogous to |
| A. | momentum |
| B. | velocity |
| C. | displacement |
| D. | mass |
| Answer» D. mass | |
| 42. |
The temperature, under thermal and electrical system analogy, is considered analogous to |
| A. | voltage |
| B. | current |
| C. | capacitance |
| D. | charge |
| Answer» A. voltage | |
| 43. |
In electrical-pneumatic system analogy the current is considered analogous to |
| A. | velocity |
| B. | pressure |
| C. | air flow |
| D. | air flow rate |
| Answer» D. air flow rate | |
| 44. |
In liquid level and electrical system analogy, voltage is considered analogous to |
| A. | head |
| B. | liquid flow |
| C. | liquid flow rate |
| D. | none of the above |
| Answer» A. head | |
| 45. |
The viscous friction co-efficient, in force-voltage analogy, is analogous to |
| A. | charge |
| B. | resistance |
| C. | reciprocal of inductance |
| D. | reciprocal of conductance |
| Answer» B. resistance | |
| 46. |
In force-voltage analogy, velocity is analogous to |
| A. | current |
| B. | charge |
| C. | inductance |
| D. | capacitance |
| Answer» A. current | |
| 47. |
In thermal-electrical analogy charge is considered analogous to |
| A. | heat flow |
| B. | reciprocal of heat flow |
| C. | reciprocal of temperature |
| D. | temperature |
| Answer» D. temperature | |
| 48. |
Mass, in force-voltage analogy, is analogous to |
| A. | charge |
| B. | current |
| C. | inductance |
| D. | resistance |
| Answer» C. inductance | |
| 49. |
The transient response of a system is mainly due to |
| A. | inertia forces |
| B. | internal forces |
| C. | stored energy |
| D. | friction |
| Answer» C. stored energy | |
| 50. |
signal will become zero when the feedback signal and reference signs are equal. |
| A. | Input |
| B. | Actuating |
| C. | Feedback |
| D. | Reference |
| Answer» B. Actuating | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.