Theory of Machine
The mechanism consisting of three turning pairs and one sliding pair, is called a

Single slider crank chain
Whitworth quick return motion mechanism
All of these
Crank and slotted lever quick return motion mechanism

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Theory of Machine
In elliptical trammels

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

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Theory of Machine
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with increasing time period
Return to equilibrium position without oscillation
Oscillate with decreasing amplitude
Oscillate with constant amplitude

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