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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially wet steam is

0.546
0.577
0.601
0.582

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The value of diagram factor depends upon

All of these
Initial pressure of steam
Back pressure
Initial conditions of steam

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Steam Boilers, Engines, Nozzles and Turbines
If partial pressure of air and steam be ‘pa’ and ‘ps’ respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

pa - ps
ps - pa
pa + ps
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Thermal efficiency of well maintained boiler will be of the order

0.5
0.75
0.9
0.4

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following boiler is best suited to meet the fluctuating demand of steam?

Locomotive boiler
Babcock and Wilcox boiler
Lancashire boiler
Cornish boiler

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