Steam Boilers, Engines, Nozzles and Turbines
A fusible plug is fitted in small boilers in order to

Avoid explosion
Extinguish fire if water level in the boiler falls below alarming limit
Control steam dome
Avoid excessive build up of pressure

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Steam Boilers, Engines, Nozzles and Turbines
The function of a flywheel is

To keep the engine speed uniform at all load conditions
To prevent fluctuation of speed
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To convert reciprocating motion of the piston into rotary motion

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