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Consider the following statements: Feedback in control system can be used
1. to reduce the sensitivity of the system to parameter variations and disturbances.
2. to change time constant of the system.
3. to increase loop gain of the system
Which of the statement given above are correct ?
1. to reduce the sensitivity of the system to parameter variations and disturbances.
2. to change time constant of the system.
3. to increase loop gain of the system
Which of the statement given above are correct ?
- a)1, 2 and 3
- b)1 and 2
- c)2 and 3
- d)1 and 3
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements: Feedback in control system can be u...
Feedback in Control System
Feedback is an essential part of any control system, and it is used to improve the performance of the system. It is a process of returning a portion of the output signal back to the input of the system.
Correct Statements
1. To reduce the sensitivity of the system to parameter variations and disturbances
When a control system is designed, it is assumed that the parameters of the system are constant. However, in reality, the parameters of the system may change due to various reasons such as temperature, aging, etc. Feedback can be used to reduce the sensitivity of the system to these parameter variations and disturbances.
2. To change the time constant of the system
The time constant of a control system is defined as the time required for the system to respond to a step input. Feedback can be used to change the time constant of the system by adjusting the gain of the feedback loop. By increasing the gain, the time constant can be reduced, and by decreasing the gain, the time constant can be increased.
Incorrect Statement
3. To increase loop gain of the system
Feedback is used to regulate the loop gain of the system, not to increase it. Loop gain is the product of the forward gain and feedback gain. By adjusting the feedback gain, the loop gain can be regulated to achieve the desired system performance.
Conclusion
Hence, the correct statements are 1 and 2. Feedback is an essential component of any control system, and it is used to improve the performance of the system by reducing the sensitivity to disturbances and adjusting the time constant of the system.
Feedback is an essential part of any control system, and it is used to improve the performance of the system. It is a process of returning a portion of the output signal back to the input of the system.
Correct Statements
1. To reduce the sensitivity of the system to parameter variations and disturbances
When a control system is designed, it is assumed that the parameters of the system are constant. However, in reality, the parameters of the system may change due to various reasons such as temperature, aging, etc. Feedback can be used to reduce the sensitivity of the system to these parameter variations and disturbances.
2. To change the time constant of the system
The time constant of a control system is defined as the time required for the system to respond to a step input. Feedback can be used to change the time constant of the system by adjusting the gain of the feedback loop. By increasing the gain, the time constant can be reduced, and by decreasing the gain, the time constant can be increased.
Incorrect Statement
3. To increase loop gain of the system
Feedback is used to regulate the loop gain of the system, not to increase it. Loop gain is the product of the forward gain and feedback gain. By adjusting the feedback gain, the loop gain can be regulated to achieve the desired system performance.
Conclusion
Hence, the correct statements are 1 and 2. Feedback is an essential component of any control system, and it is used to improve the performance of the system by reducing the sensitivity to disturbances and adjusting the time constant of the system.
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Community Answer
Consider the following statements: Feedback in control system can be u...
Sensitivity = 1/(1+gh) for negative fbdecresedtime constant is also changed
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