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

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

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Steam Boilers, Engines, Nozzles and Turbines
In an ideal impulse turbine, the

Axial velocity at inlet is equal to that at the outlet
Whirl velocity at inlet is equal to that at the outlet
Relative velocity at the inlet of the moving blade is equal to that at the outlet
Absolute velocity at the inlet of moving blade is equal to that at the outlet

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