Theory of Machine
To connect two parallel and coplanar shafts the following type of gearing is used

Spur gear
Spiral gear
None of the listed here
Bevel gear

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

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