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A proportional plus derivative controller
  1. Has high sensitivity.
  2. Increases the stability of the system.
  3. Improves the steady-state accuracy.
Which of the above statements are correct?
  • a)
    1, 2 and 3
  • b)
    1 and 2 only
  • c)
    1 and 3 only
  • d)
    2 and 3 only
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A proportional plus derivative controller Has high sensitivity. Increa...
Proportional plus derivative controller:
Proportional plus derivative control is a type of control strategy used in control systems to improve system performance. Let's break down the given statements to see which ones are correct:

1. Has high sensitivity:
- This statement is incorrect. In fact, a proportional plus derivative controller has lower sensitivity compared to a proportional-only controller. The derivative action helps to reduce sensitivity to disturbances, making the system more robust.

2. Increases the stability of the system:
- This statement is correct. The derivative action in the controller helps to improve system stability by damping out oscillations and reducing overshoot in the system response.

3. Improves the steady-state accuracy:
- This statement is also correct. The derivative action in the controller helps to improve the steady-state accuracy of the system by reducing the steady-state error and improving the response time.
Therefore, the correct statements are:
- 1 and 2 only
Overall, a proportional plus derivative controller is a popular choice in control systems as it offers improved stability and steady-state accuracy compared to a proportional-only controller.
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Community Answer
A proportional plus derivative controller Has high sensitivity. Increa...
The additive combination of proportional & Derivative control is known as P-D control.
The overall transfer function for a PD controller is given by:
Gc(s) =U(s)/E(s) = Kp+ sKD
PD controller is nothing but a differentiator (or) a High Pass Filter.
The frequency of noise is very high.
So this high pass filter will allow noise into the system which results in noise amplification.
Effects of Proportional Derivative (PD) controllers:
  • Decreases the type of the system by one
  • Reduces the rise time and settling time
  • It has high sensitivity.
  • Rise time and settling time decreases and Bandwidth increases
  • The speed of response is increased i.e. the transient response is improved
  • Improves gain margin, phase margin, and resonant peak
  • Increases the input noise
  • Improves the stability
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A proportional plus derivative controller Has high sensitivity. Increases the stability of the system. Improves the steady-state accuracy.Which of the above statements are correct?a)1, 2 and 3b)1 and 2 onlyc)1 and 3 onlyd)2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?
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