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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

Equal to
Three times
Twice
Four times

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Cut-off ratio is the ratio of

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

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in, a Coarran and Scottish marine boiler are

Inclined
Both horizontal and vertical
Vertical
Horizontal

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Steam Boilers, Engines, Nozzles and Turbines
In forced circulation steam boilers, the force is applied

All of these
To draw water
To drain off the water
To circulate water

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Steam Boilers, Engines, Nozzles and Turbines
A single acting steam engine produces ___ power than that of double acting steam engine.

Half
Double
Equal
Four times

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