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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is

4/3 kg
8/3 kg
2 kg
1 kg

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Steam Boilers, Engines, Nozzles and Turbines
The natural draught is produced by

Centrifugal fan
Steam jet
Chimney
Both (A) and (B)

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following varieties of coals is mostly used in steam boilers?

Non-coking bituminous coal
None of the listed here
Peat
Brown coal

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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)

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

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Steam Boilers, Engines, Nozzles and Turbines
Reheating of steam under ideal conditions takes place at constant

Pressure
Temperature
Entropy
Enthalpy

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Steam Boilers, Engines, Nozzles and Turbines
Expanding steam to a very low pressure (high vacuum) in steam engines is

Economical
Uneconomical
Essential
Desirable

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