Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > consider the following statements :1. The eff...
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consider the following statements :
1. The effect of feedback is to reduce the system error
2. Feedback increases the gain of the system in one frequency range but decreases in another.
3. Feedback can cause a system that is originally stable to become unstable
Which of these statements are correct ?
1. The effect of feedback is to reduce the system error
2. Feedback increases the gain of the system in one frequency range but decreases in another.
3. Feedback can cause a system that is originally stable to become unstable
Which of these statements are correct ?
- a)1, 2 and 3
- b)1 and 2
- c)2 and 3
- d)1 and 3
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
consider the following statements :1. The effect of feedback is to red...
The correct answer is option 'D', which states that statements 1 and 3 are correct. Let's discuss each statement in detail:
1. The effect of feedback is to reduce the system error:
Feedback is a technique used in control systems to reduce the difference between the desired output and the actual output of a system. By using feedback, the error between the desired and actual output is continuously monitored and fed back to the system to make corrections. This helps in reducing the system error and improving the overall performance of the system. Therefore, statement 1 is correct.
3. Feedback can cause a system that is originally stable to become unstable:
While feedback generally helps in stabilizing a system, there are cases where it can cause instability. This can happen when the feedback loop introduces a phase shift of 180 degrees or more at a certain frequency. This phase shift can lead to positive feedback, where the output of the system reinforces itself and keeps increasing. This can cause the system to become unstable and may result in oscillations or even complete failure. Therefore, statement 3 is also correct.
2. Feedback increases the gain of the system in one frequency range but decreases in another:
This statement is not entirely correct. Feedback can indeed affect the gain of a system, but it does not necessarily increase it in one frequency range while decreasing it in another. The effect of feedback on the gain depends on the specific characteristics of the system and the feedback loop. In some cases, feedback may increase the overall gain of the system, while in others, it may reduce the gain. Therefore, statement 2 is not correct.
To summarize, statements 1 and 3 are correct, while statement 2 is not. The effect of feedback is to reduce the system error, and it can cause a stable system to become unstable under certain conditions. However, it does not necessarily increase the gain in one frequency range while decreasing it in another.
1. The effect of feedback is to reduce the system error:
Feedback is a technique used in control systems to reduce the difference between the desired output and the actual output of a system. By using feedback, the error between the desired and actual output is continuously monitored and fed back to the system to make corrections. This helps in reducing the system error and improving the overall performance of the system. Therefore, statement 1 is correct.
3. Feedback can cause a system that is originally stable to become unstable:
While feedback generally helps in stabilizing a system, there are cases where it can cause instability. This can happen when the feedback loop introduces a phase shift of 180 degrees or more at a certain frequency. This phase shift can lead to positive feedback, where the output of the system reinforces itself and keeps increasing. This can cause the system to become unstable and may result in oscillations or even complete failure. Therefore, statement 3 is also correct.
2. Feedback increases the gain of the system in one frequency range but decreases in another:
This statement is not entirely correct. Feedback can indeed affect the gain of a system, but it does not necessarily increase it in one frequency range while decreasing it in another. The effect of feedback on the gain depends on the specific characteristics of the system and the feedback loop. In some cases, feedback may increase the overall gain of the system, while in others, it may reduce the gain. Therefore, statement 2 is not correct.
To summarize, statements 1 and 3 are correct, while statement 2 is not. The effect of feedback is to reduce the system error, and it can cause a stable system to become unstable under certain conditions. However, it does not necessarily increase the gain in one frequency range while decreasing it in another.
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consider the following statements :1. The effect of feedback is to red...
Correct answer is option C. Statement II and III are right
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