Control systems book by nagoor kani pdf

The two major type of control systems are open loop and closed loop systems

The control system in which the output quantity has no effect upon the input quantity are called open loop control system

When a number of elements or components are connected in a sequence to perform a specific function, the group thus formed is called a system

Ina system when the output quantity is controlled by varying the input quantity, the system is called control system

ON-OFF (OR) TWO POSITION CONTROLLER The ON-OFF or two position controller has only two fixed positions

The on-off control system is very simple in construction and hence less expensive

For this reason, it is very widely used in both industrial and domestic control systems