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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
One kilowatt-hour energy is equivalent to

1000 J
3600 kJ
360 kJ
3600 kW/sec

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the volume at cut-off to the swept volume is called

Cut-off ratio
Expansion ratio
Clearance ratio
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Size of boiler tubes is specified by

Outside diameter and inside diameter
Mean diameter and thickness
Outside diameter and thickness
Inside diameter and thickness

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

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

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Steam Boilers, Engines, Nozzles and Turbines
An economiser in a boiler

Increases steam pressure
Increases steam flow
Decreases steam pressure
Decreases fuel consumption

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following statement is correct for steam turbines as compared to reciprocating steam engines?

A steam turbine develops higher speeds
The steam consumption is less
All of these
The efficiency of steam turbine is higher

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