Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about effect of sulphur in fuel?

It helps in electrostatic precipitation of ash in flue gases
It erodes furnace walls
It has heating value
It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

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

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

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