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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
By compounding the expansion of steam in two or more cylinders, the ratio of expansion

None of these
Increases
Does not change
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
Stage efficiency is also known as

Nozzle efficiency
Diagram efficiency
Gross efficiency
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The specific heat of superheated steam in kcal/kg is generally of the order of

0.3
0.1
0.8
0.5

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine, when steam flows through the fixed blades,

Pressure decreases while velocity increases
Pressure and velocity both increases
Pressure increases while velocity decreases
Pressure and velocity both decreases

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Steam Boilers, Engines, Nozzles and Turbines
The heat loss in a boiler takes place in the form of

Moisture present in fuel and steam formed by combustion of hydrogen in fuel
Heat carried away by flue gases
Heat carried away by ash
All of these

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