371) A governor is said to be isochronous when range of speed is zero for all radii of rotation of the balls within the working range, neglecting friction.

373) The efficiency of a screw jack is dependent upon the load raised or lowered.

374) The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres.

375) A pair is said to be a kinematic pair, if the relative motion between them is completely or successfully constrained.

376) The pitching of a ship is assumed to take place with simple harmonic motion.