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 evaporation of 15.653 kg of water per hour from and at 100°C
The amount of water evaporated from and at 100°C into dry and saturated steam

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Steam Boilers, Engines, Nozzles and Turbines
A nozzle is said to be a convergent nozzle

When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
When the cross-section of the nozzle increases continuously from entrance to exit
None of these

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