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

50) Which of the following fire extinguisher would you use in order to extinguish an electrical fire?