Theory of Machine
In under damped vibrating system, the amplitude of vibration

Decreases linearly with time
Increases exponentially with time
Decreases exponentially with time
Increases linearly with time

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of loose contact of follower with cam surface
Because the uniform velocity motion is a partial parabolic motion
In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of difficulty in manufacturing cam profile

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

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