Steam Boilers, Engines, Nozzles and Turbines
The heat loss in a boiler takes place in the form of

Moisture present in fuel and steam formed by combustion of hydrogen in fuel
Heat carried away by ash
All of these
Heat carried away by flue gases

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation is defined as

The amount of water evaporated from and at 100°C into dry and saturated steam
The evaporation of 15.653 kg of water per hour from and at 100°C
The amount of water evaporated or steam produced in kg per kg of fuel burnt
The ratio of heat actually used in producing the steam to the heat liberated in the furnace

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Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

None of these
Water passes through the tubes which are surrounded by flames and hot gases
The flames and hot gases pass through the tubes which are surrounded by water
Forced circulation takes place

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