293) When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a

295) When no external force acts on a body, after giving it an initial displacement, the body is said to have free vibrations.

296) Which of the following is an example of sliding pair?

297) The coriolis component of acceleration exists whenever a point moves along a path that has

298) In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead.