Theory of Machine
The two elements of a pair are said to form a higher pair, when they

Have a line or point contact when in motion
Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion
Permit relative motion

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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Average tension of the tight side and slack side of the belt
Tension in the slack side of the belt
Sum of the tensions on the tight side and slack side of the belt
Tension in the tight side of the belt

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Theory of Machine
Open pairs are those which have

Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Two elements that permit relative motion
Elements of pairs not held together mechanically

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Theory of Machine
Oldham's coupling is the

Second inversion of double slider crank chain
Third inversion of double slider crank chain
Second inversion of single slider crank chain
Third inversion of slider crank chain

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