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In viscous dampers, energy gets absorbed by _______ fluid which passes between the piston-cylinder arrangement.

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In viscous dampers, energy gets absorbed by _______ fluid which passes between the piston-cylinder arrangement.

(a) Aluminium-based

(b) Iron-based

(c) Silicone-based

(d) Copper-based

This question was posed to me in an internship interview.

This key question is from Earthquake Resistant R.C. Buildings in division Earthquake Resistant Buildings of Construction & Building Materials

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The correct answer is (c) Silicone-based

To elaborate: There are two technologies to protect buildings from the effects of earthquakes – seismic dampers and base isolation devices. Various types of seismic dampers used are viscous dampers, yielding dampers and friction dampers. In viscous dampers, energy gets absorbed by silicone-based fluid which passes between the piston-cylinder arrangement.

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