what is open loop and close loop control system?
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2 Answers

Answer :

Open loop control system  is doesn't have feedback control  I. e input is given to output.
Closed loop control system  is having  feedback control  I. e., input is given to output  and output is regains to input to check an error while getting an accuracy.
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Answer :

A) In open loop system the input is independent         of output but output is depends on input.

A-1. no feedback path in open loop s/m

   -2. less accuracy than close loop s/m.

Ex. Washing machine, Electric heater, fan etc

B) similarly for close loop system the output is dependent on input and also input is dependent on output value,

B-1  feedback path is provided in C.L system.

   -2. high bandwidth.

   -3. high accuracy.

Ex. Air conditioner ( AC ), rocket launcher, radar          system, etc
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Description : What are the advantages of open loop control system?

Answer : Open loop control system are simple to design. Open loop control system are generally stable.

Description : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

Answer : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

Description : What is an example of an open loop system?

Answer : Open loop system. Ex. Electric heater, washing machine, fan, electric switch, etc

Description : If the gain of the open loop system is doubled, the gain margin  (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth

Answer : If the gain of the open loop system is doubled, the gain margin Becomes half

Description : What are the disadvantages of Open loop control system?

Answer : Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.