37) 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

38) The aim of a compound steam engine is

39) The average operating pressure of Benson boiler is

40) The diameter of Cornish boiler varies from

41) A single acting steam engine produces __________ power than that of double acting steam engine.