$2.$In the following diagram, item $3$ represents:

a$)$ process

b$)$ process variable

c$)$ controller

d$)$ error signal

$3.$In the diagram above representing #$9$:

a$)$ sensor

b$)$ signal transmitter

c$)$ comparator

d$)$ set$-$Point $($SP$)$

$4.$ The following diagram applies to a control of:

a$)$ self$-$regulating process

b$)$ process that ND self$-$regulates

c$)$ process that cannot be controlled

d$)$ none of the above

$5.$ In the above diagram, the dead time is approximately $\_\_\_$ min.

a$.0$

b$.40$

c$.5$

d$.0$