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Assertion (A): More damping in an isolation system is always better.

Reason (R): Damping reduces the design displacement of the system.

Select the correct option.

  • A.Both A and R are true, but R is not the correct explanation of A at all
  • B.Both A and R are false, damping increasing the design displacement instead
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A as it stands

Answer: C

Damping does reduce the displacement, but beyond a point it couples the superstructure back into the response and raises the floor accelerations that isolation was installed to reduce. The quantity is therefore optimised rather than maximised.

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