Q. On-off control, which is a special case of proportional control, has a band width of about __ percent.

A
100
B
75
C
25
Solution:

On?off control will work where the overall system has a relatively long response time, but can result in instability if the system being controlled has a rapid response time. Proportional control overcomes this by modulating the output to the controlling device, such as a control valve at a level which avoids instability, but applies correction as fast as practicable by applying the optimum quantity of proportional gain.

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