Q. In a closed-loop system, what is the purpose of feedback?
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A.
To increase the system's output.
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B.
To compare the actual output with the desired output.
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C.
To eliminate all disturbances.
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D.
To simplify the control algorithm.
Solution
Feedback in closed-loop systems is used to compare the actual output with the desired output to make necessary adjustments.
Correct Answer:
B
— To compare the actual output with the desired output.
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Q. In a transfer function, what does a zero represent?
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A.
A point where the output is zero for a non-zero input.
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B.
A point of instability.
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C.
A point where the system is stable.
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D.
A point of maximum gain.
Solution
A zero in a transfer function indicates a frequency at which the output becomes zero for a non-zero input.
Correct Answer:
A
— A point where the output is zero for a non-zero input.
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Q. What is the characteristic equation of a control system?
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A.
It is derived from the transfer function.
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B.
It describes the system's input-output relationship.
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C.
It is always a polynomial of degree one.
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D.
It determines the system's frequency response.
Solution
The characteristic equation is derived from the transfer function and is used to determine the stability of the system.
Correct Answer:
A
— It is derived from the transfer function.
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Q. What is the primary purpose of a controller in a control system?
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A.
To measure the output.
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B.
To provide a reference input.
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C.
To manipulate the input to achieve the desired output.
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D.
To stabilize the system.
Solution
The primary purpose of a controller is to manipulate the input to the system in order to achieve the desired output based on the feedback received.
Correct Answer:
C
— To manipulate the input to achieve the desired output.
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Q. Which component of a PID controller is responsible for eliminating steady-state error?
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A.
Proportional
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B.
Integral
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C.
Derivative
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D.
All of the above
Solution
The integral component of a PID controller accumulates the error over time, effectively eliminating steady-state error.
Correct Answer:
B
— Integral
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