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Steam Boilers, Engines, Nozzles and Turbines

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

Temperature only
Pressure and dryness fraction
Pressure only
Dryness fraction only

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Steam Boilers, Engines, Nozzles and Turbines
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

188 m/s
900 m/s
450 m/s
79 m/s

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Expansion ratio is the ratio of

Swept volume to the clearance volume
Clearance volume to the swept volume
Swept volume to the volume at cut-off
Volume at cut-off to the swept volume

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Steam Boilers, Engines, Nozzles and Turbines
The process of maintaining the speed of the turbine constant for various load conditions, is known as

Governing
Reheating
Bleeding
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in meters, and T1 = Absolute temperature of air outside the chimney in K)

T1 /88.25H
T1 /176.5H
88.25H/T1
176.5H/T1

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