Theory of Machine
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

n₁ + n₂ - 2
n₁ + n₂
n₁ + n₂ - 1
n₁ + n₂ + 1

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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

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

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