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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

cot²α
tan²α
sin²α
cos²α

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Steam Boilers, Engines, Nozzles and Turbines
The natural draught is produced by

Steam jet
Chimney
Both (A) and (B)
Centrifugal fan

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Steam Boilers, Engines, Nozzles and Turbines
The water tubes in a simple vertical boiler are

None of the listed here
Vertical
Horizontal
Inclined

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Steam Boilers, Engines, Nozzles and Turbines
Gusset stays in a boiler are provided to

Avoid explosion in furnace
Prevent leakage of hot flue gases
Prevent the bulging of flat surfaces
Support furnace freely from top

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Steam Boilers, Engines, Nozzles and Turbines
Evaporative capacity of boiler is expressed as

Steam pressure produced
kg of fuel fired
kg of steam produced per kg of fuel fifed
kg of steam produced

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Steam Boilers, Engines, Nozzles and Turbines
Film boiling occurs at

Very high pressures
Atmospheric pressures
Medium pressures
Very low pressure

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