39) One of the taper turning methods is by 'offsetting the tail stock'. Which part of the tail stock is offset or shifted?

40) "Work piece is to be turned on a lathe machin." What is the spindle speed (RPM) to be set, if the cutting speed is 60 m/min and the diameter of the work is 30 mm?

41) A grinding wheel is marked "51C60M6S23". Here the S indicates

42) Which one of the following time taken is correct to turn a job on lathe machine having length 350 mm, feed 0.05 mm/rev, spindle speed 350 RPM and number of cuts is 1?

43) Standard wheel marking is given as 'A16P5V" on grinding wheel. Where 'A' represents