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

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

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Steam Boilers, Engines, Nozzles and Turbines
The difference between Cornish boiler and Lancashire boiler is that

Former is fire tube type and latter is water tube type boiler
Former is water tube type and latter is fire tube type
Former contains one fire tube and latter contains two fire tubes
None of the listed here

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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 discharge the gases of combustion to the atmosphere through the chimney
All of the listed here
To exhaust the gases of combustion from the combustion chamber

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