Question $1(25$ Marks$)$

a$)$ Explain briefly the THREE $(3)$ differences between the open$-$loop and closed$-$loop systems. $[9$ Marks$]$

b$)$ List FOUR $(4)$ objectives of automatic control in real life.

$[4$ Marks$]$

c$)$ The schematic diagram in Figure $1$ below is a temperature feedback control system for a stirred$-$tank heater. Physical connections between components have been made to allow the flow of information within the system. Draw a block diagram that represents the temperature feedback control system below.

$[5$ Marks$]$

d$)$ Draw a flow$-$chart diagram that simulates how a vehicle's auto$-$cruise system might work to maintain the vehicle's speed

$[7$ Marks$]$