Q$4$ Fill the spaces:$(7)$

Final control element $-$ controllers $-$ control valves $-$ I$/$P convertor ensor $-$ set points $-$ gauge $-$ pressure $-$ PID

a$-q,$ accepts a $4-20mA$ control signal from the PCT$10$ electrical console and converts this to $3-15$ psig pneumatic signal.

b$-q,$ are used to control conditions such as flow, pressure temperature and liquid level by fully or partially opening or closing in response to signals received from $q,$ that compare a $q,$ to a "process variable" whose value is provided by $q,$ that monitor changes in such conditions. Control valves is also termed as the $q,$

The describing equation for $q,$ is

$(t)=$Kpe$(t)+$Kiqe$(t)dT+$Kdde$\frac{t}{d}t$