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Closed-loop system has higher _______ than open-loop control system and this implies increased speed of response.

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BPSC AE Paper 6 (Electrical) 25 Mar 2022 Official Paper
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  1. gain
  2. speed
  3. frequency
  4. bandwidth

Answer (Detailed Solution Below)

Option 4 : bandwidth
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Detailed Solution

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  • The transfer function for a negative closed-loop is given by:

\(T.F. = {G(s) \over 1+G(s)H(s)}\)

where G(s) = Forward path gain

H(s) = Feedback path gain

  • Due to the presence of a feedback path, the gain of the transfer function decreases.
  • As the gain-bandwidth product must be constant, hence bandwidth increases for decreasing value of gain.
  • As the transient response of the system is improved by the use of feedback and it causes the settling time to reduce and the closed-loop system has higher bandwidth than open-loop systems and this implies an increase in the speed of response.
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