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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
If the critical pressure ratio for steam is 0.546, then the steam is initially

Superheated steam
Wet steam
None of these
Dry saturated steam

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Steam Boilers, Engines, Nozzles and Turbines
The numbers of fire tubes in a Cochran boiler are

75
225
115
165

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of a cylindrical shell of a Scotch marine boiler varies from

None of these
3.5 to 4.5 m
2.5 to 3.5 m
1.5 to 2 m

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Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

Heat transfer takes place across cylinder walls
Work is done
All of these
Steam may be wet, dry or superheated after expansion

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Hard coke is used in

Cement industry
Thermal power plant
Domestic use
Blast furnace

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