Theory of Machine
The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is

Universal coupling
Flexible coupling
Oldham's coupling
Chain coupling

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Theory of Machine
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
The center of gravity of the two masses coincides with that of the body
All of these
The sum of the two masses is equal to the total mass of body

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