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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The maximum heat loss is a boiler occurs due to

Steam formation
Dry flue gases
Moisture in fuel
Unburnt carbon

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the work-done on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

Stage efficiency
Nozzle efficiency
Blading efficiency
Mechanical efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

T1 /88.25H
176.5H/T1
T1 /176.5H
88.25H/T1

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

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Steam Boilers, Engines, Nozzles and Turbines
The economiser is used in boilers to

Increase flue gas temperature
Increase thermal efficiency of boiler
Economize on fuel
Extract heat from the exhaust flue gases

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Steam Boilers, Engines, Nozzles and Turbines
The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

None of these
Forced steam jet draught
Chimney draught
Induced steam jet draught

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