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

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

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Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

To provide an adequate supply of air for the fuel combustion
To exhaust the gases of combustion from the combustion chamber
To discharge the gases of combustion to the atmosphere through the chimney
All of the listed here

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

The pressure and temperature of steam remains constant
The steam is expanded in moving blades only
The steam is expanded in nozzles only and there is a pressure drop and heat drop
The steam is expanded both in fixed and moving blades continuously

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