40) A clock shows a time 6.20 Hr. The measure of the angle ideally between the hour and minute hands of the clock is

41) Manufacture of surfaces of pipes, tubes, cylinder and spheres, construction of large tanks are by what process

42) Name the polymer resin which is widely used in marine industry

43) Which equipment is used for curing very thick ablative liners?

44) Thermocouple is used during curing to measure