Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about the function of furnace?

Separate ash from coal
Mix fuel with air and ignite
Maintain heat supply to prepare and ignite the incoming fuel
To provide proper conditions for continuous complete combustion

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

Ratio of thermal efficiency to Rankine efficiency
Ratio of brake power to the indicated power
Product of thermal efficiency and 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
Spontaneous combustion is a phenomenon in which

Explosion in furnace
All the fuel burns instantaneously producing high energy release
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
Fuel burns with less air

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