151) A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

152) The design of pin of a rocker arm of an I.C. engine is based on

153) For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

154) A wood-ruff key is

155) In a V-belt drive, the belt makes contact at the bottom of the groove of the pulley.