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Controllers MCQs

Practice Controllers MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Control SystemsControllers

A proportional controller primarily has control law?

  • Au(t)=Kp e(t)
  • Bu(t)=Ki∫e(t)dt only
  • Cu(t)=Kd de(t)/dt only
  • Du(t)=0
Report an error
Correct Answer: A. u(t)=Kp e(t)
Explanation: A P controller produces control effort proportional to the instantaneous error.
Reference: Standard control systems: controllers
Question 2
Control SystemsControllers

Integral control is particularly useful for reducing or eliminating?

  • ASteady-state error for suitable stable systems
  • BAll measurement noise
  • CPlant order
  • DEvery transient oscillation
Report an error
Correct Answer: A. Steady-state error for suitable stable systems
Explanation: Integral action accumulates error and increases low-frequency loop gain, often eliminating steady-state error to constant inputs when the resulting closed loop is stable.
Reference: Standard control systems: controllers
Question 3
Control SystemsControllers

Derivative control responds to?

  • AThe rate of change of error
  • BOnly accumulated error
  • COnly constant error magnitude
  • DThe reference amplitude squared
Report an error
Correct Answer: A. The rate of change of error
Explanation: Derivative action is proportional to de(t)/dt and anticipates changes in error.
Reference: Standard control systems: controllers
Question 4
Control SystemsControllers

The transfer function of an ideal PID controller is?

  • AKp+Ki/s+Kd s
  • BKp s+Ki+Kd/s²
  • CKp/(s+1) only
  • DKi s only
Report an error
Correct Answer: A. Kp+Ki/s+Kd s
Explanation: An ideal PID controller combines proportional, integral and derivative actions: Gc(s)=Kp+Ki/s+Kd s.
Reference: Standard control systems: controllers