Theory of Machine
The partial balancing means

Balancing partially reciprocating masses
All of these
Balancing partially revolving masses
Best balancing of engines

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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

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

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