Machine Kinematics test on “Classification of Kinematic Pairs”.
1. The pair is known as a higher pair, when the relative motion between the elements of a pair is
a) turning only
b) sliding only
c) rolling only
d) partly turning and partly sliding
Answer: d
Clarification: When the two elements of a pair have a line or point contact when relative motion takes place and the motion between the two elements is partly turning and partly sliding, then the pair is known as higher pair.
2. Which of the following is a higher pair?
a) Belt and pulley
b) Turning pair
c) Screw pair
d) Sliding pair
Answer: a
Clarification: Belt and pulley are higher pairs as the motion is partly turning and partly sliding between them.
3. When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.
a) True
b) False
Answer: a
Clarification: When the two elements of a pair are connected together mechanically in such a way that only required kind of relative motion occurs, it is then known as self closed pair.
4. When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a
a) lower pair
b) higher pair
c) self-closed pair
d) force-closed pair
Answer: d
Clarification: When the two elements of pair are not connected mechanically but are kept in contact by the action of external forces, the pair is said to be a forced-closed pair.
5. A pair of friction discs is an example of rolling pair.
a) True
b) False
Answer: b
Clarification: A pair of discs are higher pairs as the motion is partly turning and partly sliding between them.
6. The lower pairs are ___________ pairs.
a) self-closed pair
b) force-closed pair
c) screw pair
d) none of the mentioned
Answer: a
Clarification: When the two elements of a pair are connected together mechanically in such a way that only required kind of relative motion occurs, it is then known as self closed pair. The lower pairs are self closed pairs.
7. The cam and follower is an example of
a) sliding pair
b) rolling pair
c) lower pair
d) higher pair
Answer: d
Clarification: The cam and follower is an example of higher pair as it is kept in contact by the forces exerted by spring and gravity.
8. Which of the following is an example of higher pair?
a) Toothed gearing
b) Belt and rope drive
c) Ball and roller bearing
d) All of the mentioned
Answer: d
Clarification: None
9. An automobile steering gear is an example of
a) sliding pair
b) rolling pair
c) lower pair
d) higher pair
Answer: c
Clarification: None
10. A pair is said to be kinematic pair, if the relative motion between them is completely or successfully constrained.
a) True
b) False
Answer: a
Clarification: The two links or elements of a machine, when in contact with each other, are said to form a pair. If the relative motion between them is completely or successfully constrained, the pair is known as kinematic pair.
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