304) If the number of links in a mechanism are equal to l, then the number of possible inversions are equal to

306) The pressure angle for involute gears depends upon the size of teeth.

307) The maximum displacement of a body, from its mean position is called amplitude.

308) The total number of instantaneous centres for a mechanism consisting of n links are

309) The acceleration of a particle moving with simple harmonic motion, at any instant is given by