Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a boiler is defined as

Ratio of the mass of steam produced to the mass of total water supplied in a given time
None of these
Ratio of the heat liberated in the furnace to the heat actually used in producing steam
Ratio of heat actually used in producing steam to the heat liberated in the furnace

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Steam Boilers, Engines, Nozzles and Turbines
Pick up the correct statement as regards Cornish boiler and Lancashire boiler

Cornish is fire tube and Lancashire is water tube
Cornish has two fire tubes and Lancashire has one
Lancashire has two fire tubes and Cornish has one
Cornish is water tube and Lancashire is fire tube

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