Theory of Machine
An exact straight line motion mechanism is a

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

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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
The sum of the two masses is equal to the total mass of body
All of these

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Theory of Machine
Hammer blow

Varies as the square root of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies inversely with the square of the speed

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Theory of Machine
The maximum fluctuation of speed is the

Difference of minimum fluctuation of speed and the mean speed
Sum of maximum and minimum speeds
Difference of the maximum and minimum speeds
Variations of speed above and below the mean resisting torque line

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