$1.$ What are strengths and weaknesses of a feedback control system?

$2.$ Give TWO $(2)$ examples of

a$)$ Flow control

b$)$ Pressure control

c$)$ Liquid level control

d$)$ Temperature control

e$)$ Composition control

$3.$ Identify the hardware elements present in the feedback loop for the temperature control of a stirred tank heater $?$