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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,

Pressure remains constant
Velocity increases
Velocity remains constant
Velocity decreases

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

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

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Steam Boilers, Engines, Nozzles and Turbines
An air preheater

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

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Steam Boilers, Engines, Nozzles and Turbines
A closed vessel made of steel and used for the generation of steam is called a

Steam injector
Steam condenser
Steam boiler
Steam turbine

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam at throat of the nozzle is __________ the velocity of sound.

More than
None of these
Less than
Equal to

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Steam Boilers, Engines, Nozzles and Turbines
Water boils when its vapor pressure

Equals the pressure of water in the container
Equals that of the surroundings
Equals 760 mm of mercury
Equals to atmospheric pressure

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MORE MCQ ON Steam Boilers, Engines, Nozzles and Turbines

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