Theory of Machine
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

Greater than unity
Zero
Less than unity
Equal to unity

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Theory of Machine
Inertia force acts

Along the direction of acceleration force
Opposite to the direction of acceleration force
None of the listed here
Perpendicular to the acceleration force

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