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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Heating of dry steam above saturation temperature is known as

Superheating
Super saturation
Latent heat
Enthalpy

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following boilers is best suited to meet fluctuating demands?

Cochran
Lancashire
Babcock and Wilcox
Locomotive

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Steam Boilers, Engines, Nozzles and Turbines
Secondary air is the air used to

Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Transport and dry the coal
Provide air around burners for obtaining optimum combustion
Air delivered by induced draft fan

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Steam Boilers, Engines, Nozzles and Turbines
Alkaline pyrogallate is used in Orsat's apparatus for absorption of

O₂
N₂
CO₂
CO

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Steam Boilers, Engines, Nozzles and Turbines
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

79 m/s
900 m/s
188 m/s
450 m/s

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Steam Boilers, Engines, Nozzles and Turbines
The diameters of fire tubes and superheater tubes in locomotive boiler are

24.5 mm, 65 mm
47.5 mm, 130 mm
32.5 mm, 180 mm
65.5 mm, 210 mm

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