Steam Boilers, Engines, Nozzles and Turbines
Pick up the wrong statement about critical condition of steam

Specific volume of steam and liquid is same
This is the maximum pressure limit
Latent heat is zero
Liquid directly becomes steam

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Explosion in furnace
Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
All the fuel burns instantaneously producing high energy release
Fuel burns with less air

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