383) The interference may only be avoided if the addendum circles of the two mating gears cut the common tangent to the base circles between the points of tangency.

384) The spigot and socket joint is mostly used for pipes which are burried in the earth.

385) The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is

386) In the levers of third type, the mechanical advantage is __________ one.

387) The edges of the boiler plates are bevelled to an angle of