Steam Boilers, Engines, Nozzles and Turbines
The temperature of flue gases at air heater outlet should be

Below dew point temperature of flue gases
Less than wet bulb temperature of flue gases
Above dew point temperature of flue gases
100°C

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

Ratio of the heat liberated in the furnace to the heat actually used in producing steam
None of these
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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Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

Steam is admitted at boiler pressure and exhausted at condenser pressure
All of these
There is no pressure drop due to condensation
The expansion (or compression) of the steam is hyperbolic

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