39) A stationary mass of gas is compressed without friction from an initial state of 0.3 cubic meter and 0.105 Mpa to a final state of 0.15 cubic meter and 0.105 Mpa, the pressure remaining constant during the process. There is a transfer of 37.6 kJ of heat fr

40) A turner is turning a job of 350 mm long and 50 mm diameter at a cutting speed of 44 m/min. and a feed of 0.5 mm per revolution. The time required for one complete cut is (take Pie = 22/7)

41) The heat that must be absorbed by ice of mass 500g at (-10 degree centigrade) to take it to water at 20 degree centigrade is (specific heat of ice is 2.2 kJ/kgK, specific heat of water is 4.2 kJ/kgK and Latent heat of fusion of ice is 300 kJ/kg)

42) Which of the processes gives the least surface roughness?

43) Which of the following material cannot be machined by EDM?