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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A double acting steam engine with a cylinder diameter of 190 mm and a stroke of 300 mm has a cut-off of 0.35. The expansion ratio for this engine is nearly

10.05
1.05
6.65
2.86

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Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a reaction turbine is

(1 + cos²α)/2 cos²α
2 sin²α/(1 + sin²α)
2 cos²α/(1 + cos²α)
(1 + sin²α)/2 sin²α

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Steam Boilers, Engines, Nozzles and Turbines
Feed water conditioning in thermal power plants in done to

Increase heat transfer rate
Increase efficiency of thermal power plant
Increase steam parameters
Reduce hardness and for removal of solids

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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
The effect of super-saturation is that the

Exit velocity of steam reduces
Entropy and specific volume of the steam increases
All of these
Mass of the steam discharged increases

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Steam Boilers, Engines, Nozzles and Turbines
The numbers of fire tubes in a Cochran boiler are

225
115
75
165

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