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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Gross or stage efficiency
Blading efficiency
Mechanical efficiency
Nozzle efficiency

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Steam Boilers, Engines, Nozzles and Turbines
During storage, the heating value of coal

Remain constant
Increases
May increase or decrease depending upon the method of storage
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The number of flue tubes in Lancashire boiler is

Zero
One
Four
Two

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

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

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Steam Boilers, Engines, Nozzles and Turbines
Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

Remain as it was
Flash i.e. get converted into steam
Boil
Cool down

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Steam Boilers, Engines, Nozzles and Turbines
The function of a cross-head is to guide motion of the _________ and to prevent it from bending.

Piston rod
Eccentric rod
Valve rod
Connecting rod

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