Steam Boilers, Engines, Nozzles and Turbines
The effect of friction on the flow of steam through a nozzle is to

Increase the mass flow rate and to increase the exit temperature
Decrease the mass flow rate and to decrease the wetness of steam
Decrease the mass flow rate and to increase the wetness of steam
Increase the exit temperature without any effect on mass flow rate

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

The two different boilers of the same make
The given boiler with the model
Any type of boilers operating under any conditions
Two different makes of boilers operating under the same operating conditions

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Steam Boilers, Engines, Nozzles and Turbines
The principal function of a stop valve is to

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