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

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 decreases continuously from entrance to exit
When the cross-section of the nozzle increases continuously from entrance to exit
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The power of a boiler may be defined as

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 amount of water evaporated from and at 100° C into dry and saturated steam
The ratio of heat actually used in producing the steam to the heat liberated in the furnace

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