52) The taper in a taper pin reamer is

53) A hole is to be made on mild steel with a 12 mm diameter reamer. If the under size is 0.3 mm and ifthe oversize is 0.05 mm, what will be the diameter of the drill for drilling the hole before reaming?

54) The side of a regular hexagon is 10 mm. What is the across flat to flat of the hexagon?

55) The process of dipping anodized parts in hot water is known as

56) Which of the following is an example of an inorganic coating?