Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Consider the following statements:1. The effe...
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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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Consider the following statements:1. The effect of feedback is to redu...
Feedback in Control Systems
Feedback is an essential aspect of control systems and has many applications in various fields of engineering. Feedback is a process in which the output of a system is fed back to its input, either directly or through some other component of the system. This feedback loop allows the system to adjust its output based on certain criteria, such as the desired setpoint or the error between the actual output and the setpoint. In this way, feedback can be used to improve the performance of a system, reduce its error, and make it more stable.
Statement 1: The effect of feedback is to reduce the system error.
The statement is correct. Feedback can be used to reduce the system error and improve its performance. By measuring the error between the output and the setpoint, and adjusting the input accordingly, feedback can help to minimize the error and bring the system closer to the desired setpoint. This is achieved by using a controller that compares the actual output to the setpoint and generates a control signal that adjusts the input to the system.
Statement 2: Feedback increases the gain of the system in one frequency range but decreases in another.
The statement is correct. Feedback can affect the gain and stability of a system in different frequency ranges. In some cases, feedback can increase the gain of the system in a particular frequency range, while in other cases, it can decrease the gain and destabilize the system. This is due to the fact that feedback introduces a phase shift in the system's response, which can interact with the system's natural frequency and cause resonance or instability.
Statement 3: Feedback can cause a system that is originally stable to become unstable.
The statement is correct. Feedback can cause a stable system to become unstable if the gain and phase shift introduced by the feedback loop are not properly tuned. This can lead to instability, oscillations, and even system failure. Therefore, it is important to design feedback systems that are stable and robust, and to ensure that the gain and phase margins are sufficient to prevent instability.
Feedback is an essential aspect of control systems and has many applications in various fields of engineering. Feedback is a process in which the output of a system is fed back to its input, either directly or through some other component of the system. This feedback loop allows the system to adjust its output based on certain criteria, such as the desired setpoint or the error between the actual output and the setpoint. In this way, feedback can be used to improve the performance of a system, reduce its error, and make it more stable.
Statement 1: The effect of feedback is to reduce the system error.
The statement is correct. Feedback can be used to reduce the system error and improve its performance. By measuring the error between the output and the setpoint, and adjusting the input accordingly, feedback can help to minimize the error and bring the system closer to the desired setpoint. This is achieved by using a controller that compares the actual output to the setpoint and generates a control signal that adjusts the input to the system.
Statement 2: Feedback increases the gain of the system in one frequency range but decreases in another.
The statement is correct. Feedback can affect the gain and stability of a system in different frequency ranges. In some cases, feedback can increase the gain of the system in a particular frequency range, while in other cases, it can decrease the gain and destabilize the system. This is due to the fact that feedback introduces a phase shift in the system's response, which can interact with the system's natural frequency and cause resonance or instability.
Statement 3: Feedback can cause a system that is originally stable to become unstable.
The statement is correct. Feedback can cause a stable system to become unstable if the gain and phase shift introduced by the feedback loop are not properly tuned. This can lead to instability, oscillations, and even system failure. Therefore, it is important to design feedback systems that are stable and robust, and to ensure that the gain and phase margins are sufficient to prevent instability.
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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 ?a)1, 2 and 3b)1 and 2c)2 and 3d)1 and 3Correct answer is option 'D'. Can you explain this answer?
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