Theory of Machine
Which of the following is an example of a higher pair?

Ball and roller bearing
Belt and rope drive
Toothed gearing
All of the listed here

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

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