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
The expansion (or compression) of the steam is hyperbolic
All of these
There is no pressure drop due to condensation

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Steam Boilers, Engines, Nozzles and Turbines
Blow off cock in a boiler is used to

Increase the temperature of saturated steam without raising its pressure
Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

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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 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

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