Theory of Machine
To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use?

Bevel gear
Spur gear
Spiral gear
Worm gear

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Theory of Machine
Kinematic pairs are those which have

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

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Theory of Machine
Oldham's coupling is the

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

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