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Steam Boilers, Engines, Nozzles and Turbines

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

Double
Four times
Half
Equal

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Steam Boilers, Engines, Nozzles and Turbines
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

0.74
0.78
0.63
0.56

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In a nozzle, the effect of super-saturation is to

Decrease dryness fraction of steam
Increase the heat drop
Increase the entropy
Decrease specific volume of steam

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

None of these
Cut-off ratio
Clearance ratio
Expansion ratio

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is required for a steam condensing plant?

Condensate pump
Condenser
All of these
Air extraction pump

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