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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Blading efficiency is also known as

Stage efficiency
None of these
Diagram efficiency
Nozzle efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The forced circulation of water does not take place in

Lancashire boiler
Velox boiler
Benson boiler
LaMont boiler

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Steam Boilers, Engines, Nozzles and Turbines
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

ηS = ηN / ηB
ηS = ηB × ηN
None of the listed here
ηS = ηB / ηN

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

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

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

Very low pressure
Very high pressures
Medium pressures
Atmospheric pressures

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

Boiler efficiency
Vacuum efficiency
Condenser efficiency
Nozzle efficiency

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