Theory of Machine
The cam follower generally used in aircraft engines is

Knife edge follower
Spherical faced follower
Flat faced follower
Roller follower

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

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