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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a throttling process

Steam entropy remains constant
Steam enthalpy remains constant
Steam temperature remains constant
Steam pressure remains constant

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Steam Boilers, Engines, Nozzles and Turbines
Presence of moisture in fuel oil would

Keep the burner tips cool
Because sputtering, possibly extinguishing flame
Aid in proper combustion
Clean the nozzles

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Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are those in which

Flue gases pass through tubes and water around it
Water passes through the tubes and flue gases around it
Work is done during adiabatic expansion
Change in enthalpy

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

Factor of evaporation
Equivalent evaporation
Boiler efficiency
Power of a boiler

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Steam Boilers, Engines, Nozzles and Turbines
In a nozzle, the effect of super-saturation is to

Decrease specific volume of steam
Decrease dryness fraction of steam
Increase the entropy
Increase the heat drop

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

Same
More
Less
None of these

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