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

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

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Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Product of thermal efficiency and Rankine efficiency
Ratio of brake power to the indicated power
Ratio of thermal efficiency to the Rankine efficiency
Ratio of heat equivalent to indicated power to the energy supplied in steam

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Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

Equal temperature drop in each cylinder for economy of steam
Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
All of these
Equal power developed in each cylinder for uniform turning moment

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