45) A main shaft is running at a speed of 200 r.p.m and machine spindle is to be driven directly from main shaft to run at 100 r.p.m. If the diameter of the pulley fixed on machine shaft is 20 cm, what would be the diameters of the pulley fitted on main shaft?

46) The process of increasing the length of a steel bar of the expense of its width or thickness or both is known as

47) The outer diameter (in mm) of a flat washer in terms of bolt diameter d is given by

48) The process of an accurate sizing and finishing of a previously drilled hole is known as

49) The operation of making cone shaped enlargement at the end of the hole to provide recess for a flat head screw fitted into the hole is known as