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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Willian’s line follows the law (where b = A constant representing the shape of the Willian’s line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

m = a + b × I.P.
I.P. = b × m + a
m = (b/I.P.) - a
I.P. = a × m + b

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Steam Boilers, Engines, Nozzles and Turbines
A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

Economiser
Steam condenser
Steam boiler
Steam preheater

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Steam Boilers, Engines, Nozzles and Turbines
Sulphur in coal results in

Spontaneous combustion during coal storage
Facilitating ash precipitation
All of these
Corroding air heaters

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Steam Boilers, Engines, Nozzles and Turbines
In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

Worsen
May improve/worsen depending on size
Improve
Remain unaffected

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Steam Boilers, Engines, Nozzles and Turbines
The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become

Wet
Superheated
Remain dry saturated
Dry

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