The pitch diameter is the __________ diameter of an external or internal screw thread.

The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

The coefficient of friction between the belt and pulley depends upon the

The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be