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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The value of the reheat factor varies from

1.08 to 1.10
1.02 to 1.06
1.6 to 2
1.2 to 1.6

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Steam Boilers, Engines, Nozzles and Turbines
Efficiency of a thermal cycle increases by

Both (A) and (B)
Regeneration
Cooling of steam
Reheating of steam

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of a cylindrical shell of a Scotch marine boiler varies from

3.5 to 4.5 m
2.5 to 3.5 m
1.5 to 2 m
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

ηS = ηB / ηN
ηS = ηB × ηN
ηS = ηN / ηB
None of the listed here

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Steam Boilers, Engines, Nozzles and Turbines
The average operating pressure of Benson boiler is

250 bar
200 bar
150 bar
100 bar

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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
2.86
1.05
6.65

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