Discussion
Which control system has hysteresis property ?
Answer: A
An ON-OFF controller has hysteresis: the output switches on when the measured value crosses one threshold and off at a different threshold, and the gap between them, the differential gap, prevents the switch from chattering around the set point, so option A is correct. Proportional, integral and P-I-D controllers produce an output that varies smoothly with the error, its integral or its derivative, and they are not characterised by a switching gap.
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