247) According to law of gearing, the common normal at the point of contact between a pair of teeth must always pass through the pitch point.

Answer is:

Yes

Theory of Machines MCQ with Answers

248) The motion between a pair which takes place in __________ is known as incompletely constrained motion.

Answer is:

more than one direction

Explanation:

When the motion between a pair can take place in more than one direction, then the motion is called an incompletely constrained motion. The change in the direction of impressed force may alter the direction of relative motion between the pair. A circular bar or shaft in a circular hole is an example of an incompletely constrained motion as it may either rotate or slide in a hole.