Theory of Machine
Which of the following mechanism is an approximate straight line motion mechanism?

All of these
Watt's mechanism
Grasshopper mechanism
Robert's mechanism

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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

All of these
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
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

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Theory of Machine
In elliptical trammels

Three pairs turning and one pair sliding
All four pairs are turning
One pair turning and three pairs sliding
Two pairs turning and two pairs sliding

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