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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
An air preheater

Increases evaporative capacity of the boiler
Enables low grade fuel to be burnt
All of these
Increases the efficiency of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
O₂ content in atmospheric air on volume basis is

0.3
0.4
0.23
0.21

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Steam Boilers, Engines, Nozzles and Turbines
With increase in load, radiant superheater has

Drooping characteristic
Flat characteristic
Rising characteristic
Linear characteristic

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Steam Boilers, Engines, Nozzles and Turbines
The mechanical draught _________ with the amount of smoke.

Increases
Does not effect
None of these
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
Over fire burning is the phenomenon of

Fuel bed firing
Supply of excess coal
Supply of excess, air
Burning CO and unburnt in upper zone of furnace by supplying more air

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Steam Boilers, Engines, Nozzles and Turbines
A wet vapor can be completely specified by

Temperature only
Pressure only
Dryness fraction only
Pressure and dryness fraction

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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