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If the damping factor is unity the system refers to

Q.  
If the damping factor is unity the system refers to


Answer & Explanation

If,
Damping factor ζ= 1, --- Critically Damped System.
Damping factor ζ< 1, --- Under Damped System.
Damping factor ζ> 1, --- Over Damped System.

Thus correct option is: A.

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