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Measurements and Instrumentation

Q1: In air friction damping

A the air pressure opposes the motion of piston when it is moving inwards

B the air pressure opposes the motion of piston when it is moving outwards

C the air pressure opposes the motion of piston both when it is moving inwards as well as outwards

D the air pressure may oppose or aid the motion of piston depending on the design

ANS:C - the air pressure opposes the motion of piston both when it is moving inwards as well as outwards

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