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Steam Boilers, Engines, Nozzles and Turbines

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.

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

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Steam Boilers, Engines, Nozzles and Turbines
Film boiling occurs at

Medium pressures
Very low pressure
Very high pressures
Atmospheric pressures

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse reaction turbine, the pressure drops gradually and continuously over

Moving blades
Fixed blades
None of these
Both fixed and moving blades

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

Factor of evaporation
Equivalent evaporation
Boiler efficiency
Power of a boiler

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

Less
Same
More
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Willian's law states that the steam consumption per hour provided with a throttled governor is proportional to (where I.P. = Indicated power)

1/(I.P)²
(I.P.)²
1/(I.P)
I.P.

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