380) A riveted joint is a __________ fastening.

381) The springs mostly used in machinery have spring index less than 3.

382) According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

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.