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

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

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

The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The amount of water evaporated or steam produced in kg per kg of fuel burnt
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

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Steam Boilers, Engines, Nozzles and Turbines
In an ideal impulse turbine, the

Absolute velocity at the inlet of moving blade is equal to that at the outlet
Whirl velocity at inlet is equal to that at the outlet
Axial velocity at inlet is equal to that at the outlet
Relative velocity at the inlet of the moving blade is equal to that at the outlet

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