Theory of Machine
According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centers will lie on a

Parabolic curve
Triangle
Rectangle
Straight line

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Both open belt drive and crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted
Open belt drive is recommended
Crossed belt drive is recommended

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