Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₁l₂ = kG²
l₂ = kG
l₁l₂ = kG
l₁ = kG

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Theory of Machine
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

Become equal to R/4
Become equal to R/2
Become equal to 2R
Remain same as before

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Theory of Machine
Oldham's coupling is the

Third inversion of double slider crank chain
Second inversion of double slider crank chain
Second inversion of single slider crank chain
Third inversion of slider crank chain

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