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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
O₂ content in atmospheric air on volume basis is

0.23
0.3
0.4
0.21

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

0° to each other
None of these
90° to each other
180° to each other

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of steam turbines may be improved by

Binary vapor plant
Any one of these
Regenerative feed heating
Reheating of steam

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Steam Boilers, Engines, Nozzles and Turbines
De-Laval turbines are mostly used

For small power purposes and low speeds
Where low speeds are required
For small power purposes and high speeds
For large power purposes

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Steam Boilers, Engines, Nozzles and Turbines
A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called

Blow off cock
Stop valve
None of these
Superheater

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