Theory of Machine
Two systems shall be dynamically equivalent when

G. of two coincides
M.I. of two about an axis through e.g. is equal
The mass of two are same
All of these

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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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