Theory of Machine
The centre of gravity of a coupler link in a four bar mechanism will experience

Only angular acceleration
Both linear and angular acceleration
No acceleration
Only linear acceleration

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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

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

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