378) If the tearing efficiency of a riveted joint is 50%, then the ratio of diameter of rivet to the pitch is

379) The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

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