Exam Question
(a) What is feedback control? Explain open loop and close loop systems with reference to shipboard applications? (8)
(b) What is P, PI and PID control. Make a neat comparison among all these methods of controlling with examples. (8)
Class 2 (2nd Engineer)
MET
📅 Jan 2025
Reference Answer
(a) Open loop control system:
An open loop control system is the one in which the output signal is NOT fed back to the input of the system. Therefore, an open loop control system is also referred to as a non-feedback control system.
In the case of an open loop control system, the output has NO control over the control action of the system. Thus, the open loop control system follows its input signals regardless of the final results. The input is supplied to the controller, which produces an actuating signal (or control signal). This actuating single is supplied to the plant or processing system, which is to be controlled.
The major disadvantage of an open loop control system is that it is poorly equipped to handle the disturbances, which may reduce its ability to complete the desired task.
An open loop control system is the one in which the output signal is NOT fed back to the input of the system. Therefore, an open loop control system is also referred to as a non-feedback control system.
In the case of an open loop control system, the output has NO control over the control action of the system. Thus, the open loop control system follows its input signals regardless of the final results. The input is supplied to the controller, which produces an actuating signal (or control signal). This actuating single is supplied to the plant or processing system, which is to be controlled.
The major disadvantage of an open loop control system is that it is poorly equipped to handle the disturbances, which may reduce its ability to complete the desired task.
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