278) The magnitude of velocities of the points on a rigid link is

directly proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre

directly proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

inversely proportional to the distance from the points to the instantaneous centre and is parallel to the line joining the point to the instantaneous centre

inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

Answer is:

inversely proportional to the distance from the points to the instantaneous centre and is perpendicular to the line joining the point to the instantaneous centre

Theory of Machines MCQ with Answers

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280) In a single slider crank chain

Answer is:

three are turning pairs and one is a sliding pair

Explanation:

Single slider crank chain is a modification of the four bar chain. Single slider crank chain consists of one sliding pair and three turning pairs. It is, usually, found in reciprocating steam engine mechanism. This type of mechanism converts rotary motion into reciprocating motion. The inversions of a single slider crank chain are found in the following mechanisms.
* Pendulum pump or Bull engine
* Oscillating cylinder engine
* Rotary internal combustion engine or Gnome engine.
* Crank and slotted lever quick return motion mechanism.
* Whitworth quick return motion mechanism.