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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

None of these
(h - hf1)/2257
(h × hf1)/2257
(h + hf1)/2257

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Steam Boilers, Engines, Nozzles and Turbines
Throttle governing of steam engines is a method of controlling the engine output by varying

Temperature of intake steam
Volume of intake steam
Pressure of intake steam
All of these

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Steam Boilers, Engines, Nozzles and Turbines
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is

0.25
0.4
0.5
0.8

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Steam Boilers, Engines, Nozzles and Turbines
Latent heat of dry steam at atmospheric pressure is equal to

539 BTU/ lb
100 kcal/ kg
539 kcal/ kg
427 kcal/ kg

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Steam Boilers, Engines, Nozzles and Turbines
The length of Cornish boiler varies from

2 to 4.5 m
5 to 7.5 m
7 to 9 m
3 to 5 m

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Steam Boilers, Engines, Nozzles and Turbines
Hygrometry deals with the

Pressure of air
Temperature of air
Water vapor in air
Hygroscopic substances

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