51) What is the maximum radius of cylinder which can be made out of a regular square cross section rod with side 10 mm?

52) How many rectangular pieces of size 10 mm x 100 mm can be cut from a sheet of size 50 mm x 100 mm?

53) What is the turning time required in minutes for one complete cut on a piece of work 350mm long and 50mm in diameter if the feed is 0.5mm per revolution at 350 rpm

54) A drawing of a shaft specifies to turn the outer diameter to 20h6. What is the maximum permissible size of the shaft in mm

55) Datum is required to measure