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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The basic purpose of drum in boiler is to

Separate steam from water
Remove salts from water
Serve as storage of feed water for water wall
Serve as storage of steam

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Steam Boilers, Engines, Nozzles and Turbines
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Decreases
Increases/decreases depending on steam temperature requirements
Increases
Remains unchanged

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Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

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

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Steam Boilers, Engines, Nozzles and Turbines
The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

Dry
Wet
Remain dry saturated
Superheated

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Steam Boilers, Engines, Nozzles and Turbines
De-Laval turbine is a

Simple impulse turbine
None of these
Impulse-reaction turbine
Simple reaction turbine

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the clearance volume to the swept volume is called

Clearance ratio
Expansion ratio
None of these
Cut-off ratio

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