There are two main types of systems open looped and closed looped systems: 

a). An example of an open loop system is a sewing machine: To enable the sewing machine to work, the pedal needs to be compressed. A connection is made and the needle starts sewing. Use basic components of open loop system and build block diagrams of sewing machine. 

b).An example of a closed loop system is an iron that can monitor its own temperature. The iron regulates its own temperature without anyone else having to. When it reaches the desired temperature it stops heating up, when it cools down too much, a trigger will tell it to heat up again. Use basic components of closed loop system and build block diagrams of iron that can monitor its own temperature.