Theory of Machine
The partial balancing means

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

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Theory of Machine
Open pairs are those which have

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

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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

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

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