Theory of Machine
Transmission of power from the engine to the rear axle of an automobile is by means of

Compound gears
Hooke's joint
Crown gear
Worm and wheel method

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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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