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
A. 1.05
B. 2.86
C. 6.65
D. 10.05
Answer: Option B
This Question Belongs to Mechanical Engineering >> Steam Boilers, Engines, Nozzles And Turbines
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this is not the correct formula given below unless compression ratio is given or its value for double acting steam engine is 1.
WE KNOW THAT EXPANSION RATIO,
r = 1/cut off ratio = 1/0.35 = 2.86.
Expansion ratio = 1 / cut-off ratio
Expansion ratio= 1/.35
=2.86
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