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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

10 to 15%
20 to 30%
15 to 20%
30 to 40%

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Steam Boilers, Engines, Nozzles and Turbines
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is

0.25
0.8
0.4
0.5

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Steam Boilers, Engines, Nozzles and Turbines
100% efficiency of a thermal cycle cannot be achieved because of

It is not possible to achieve 0°K temperature
Frictional losses
Non availability of ideal substance
Leakage

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Steam Boilers, Engines, Nozzles and Turbines
The mechanical draught _________ with the amount of smoke.

Increases
Decreases
None of these
Does not effect

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

1000 J
360 kJ
3600 kW/sec
3600 kJ

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