Question 1
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Pass Ratio : 100%
The relation l = 2/3(j+2) apply to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
Question 2
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Pass Ratio : 100%
In an open pair, the two elements of a pair
Explanation: When the two elements of a pair are not held mechanically, they are called open pair.
Question 3
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Pass Ratio : 100%
When the two elements of a pair have _____________ when in motion, it is said to a lower pair.
Explanation: When the two elements of a pair have surface contact when relative motion, takes place and the surface of one element slides over the surface of the other, the pair formed is known as lower pair. It will be seen that sliding pairs, turning pairs and screw pairs form lower pairs.
Question 6
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Pass Ratio : 100%
A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a
Explanation: A kinematic chain is defined as a combination of kinematic pairs, joined in such a way that each link forms a part of two pairs and the relative motion between the links or elements is completely or successfully constrained.
Question 8
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Pass Ratio : 100%
The two elements of a pair are said to form a higher pair, when they
Explanation: 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.
Question 9
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Pass Ratio : 100%
The sliding pairs, turning pairs and screw pairs form lower pairs.
Explanation: When the two elements of a pair have surface contact when relative motion, takes place and the surface of one element slides over the surface of the other, the pair formed is known as lower pair. It will be seen that sliding pairs, turning pairs and screw pairs form lower pairs.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The two elements of a pair are said to form a ___________ when they permit relative motion between them.
Explanation: 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.