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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The diameter of superheated tubes in a locomotive boiler is

130 mm
13 mm
31 mm
230 mm

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Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about the function of furnace?

Separate ash from coal
Maintain heat supply to prepare and ignite the incoming fuel
Mix fuel with air and ignite
To provide proper conditions for continuous complete combustion

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge of steam through a convergent-divergent nozzle depends upon

Both (A) and (B)
Initial pressure and volume of steam
Final pressure of steam leaving the nozzle
Area of nozzle at throat

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

More
Less
None of these
Same

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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
6.65
1.05
2.86

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of total useful heat drop to the total isentropic heat drop, is called

Rankine efficiency
Stage efficiency
Internal efficiency
None of these

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