If the load on a ball bearing is reduced to half, the life of the ball bearing will

For full depth of involute spur gears, minimum number of teeth of pinion to avoid interference depends upon

In the design of shafts made of ductile materials subjected to twisting moment and bending moment, the recommended theory of failure is

In an engineering drawing one finds the designation of $$20G7F8.$$ The position of tolerance of the hole is indicated by