Answer / piyush gaur

p stand for proportional, i stand for integral , d stand for
derivative.
It is most widely used in industries. Its mechanism is based
on feedback(feedback controller). It calculate an error
value as the difference between a measured process variable
and a desired set point. it minimize the error.

Answer / abhi

pid means praportional integaral and derivatives.
it is used to minimise the error between process value and
set value (pv-sv) to maintain the process in smooth
condition.

can anyone guide me how to get any of the previous year GAIL question papers? are they available? 0n 2nd august i have to take the written test.

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