Theory of Machine
An exact straight line motion mechanism is a

Peaucellier's mechanism
All of these
Scott-Russell's mechanism
Hart's mechanism

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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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Theory of Machine
For dynamic balancing of a shaft

None of these
The net dynamic force acting on the shaft is equal to zero
Both (A) and (B)
The net couple due to the dynamic forces acting on the shaft is equal to zero

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