Free Control Systems MCQs with Answers
72 Control Systems MCQs from Electrical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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72 questions · page 4 of 4
- A. Servomechanism
- B. Feedback
- C. Output pattern
- D. Input pattern
Explanation: Feedback returns a portion of the output to the input for comparison and correction, which is the defining feature of a closed-loop…
Correct answer: Feedback- A. open
- B. closed
- C. partially closed
- D. any of the above
Explanation: A conventional automatic toaster operates for a preset time and then switches off, without measuring the browning of the toast.
Correct answer: open- 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
Explanation: Open-loop systems cannot automatically correct changes in plant characteristics or operating conditions, so periodic recalibration may be…
Correct answer: Recalibration is not required for maintaining the required quality of the output- A. Digestive system
- B. Perspiration system
- C. Ear
- D. Leg movement
Explanation: Perspiration helps regulate body temperature by allowing evaporative cooling when the body becomes too warm.
Correct answer: Perspiration system- A. computer control system
- B. digital data system
- C. stochastic control system
- D. adaptive control system
Explanation: A stochastic control system is designed or analyzed when the system or its inputs include random, probabilistic actions.
Correct answer: stochastic control system- A. Clutch
- B. Eyes
- C. Needle of the speedometer
- D. Steering wheel
- E. None of the above
Explanation: The speedometer needle shows the car’s actual speed, providing the driver with feedback to compare with the desired 50 km/h.
Correct answer: Needle of the speedometer- 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
Explanation: In an open-loop system, the controller does not measure or use the output, so its control action is independent of output feedback.
Correct answer: the control action is independent of the output- A. Closed loop system
- B. Semiclosed loop system
- C. Open system
- D. None of the above
Explanation: A closed-loop system feeds the output back for comparison with the reference input, so the control action depends on the output.
Correct answer: Closed loop system- A. Field controlled D.C. motor
- B. Ward leonard control
- C. Metadyne
- D. Stroboscope
Explanation: A field-controlled DC motor can be operated in open loop by setting its field current without measuring the resulting speed.
Correct answer: Field controlled D.C. motor- A. Open loop system
- B. Closed loop system
- C. Both A. and B.
- D. Neither A. nor B.
Explanation: Closed-loop systems can oscillate when feedback introduces excessive phase shift or insufficient stability margin.
Correct answer: Closed loop system- A. Transient response
- B. Error response
- C. Dynamic response
- D. Either of the above
Explanation: The initial part of a system response, before the output settles to its final value, is the transient response.
Correct answer: Transient response- A. good stability
- B. slow response
- C. good accuracy
- D. sufficient power handling capacity
Explanation: A good control system should respond quickly while maintaining stability, accuracy, and adequate power capability.
Correct answer: slow response