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electronics and communication engineering measurements and instrumentation
1. In air friction damping
(A): the air pressure may oppose or aid the motion of piston depending on the design
(B): the air pressure opposes the motion of piston both when it is moving inwards as well as outwards
(C): the air pressure opposes the motion of piston when it is moving inwards
(D): the air pressure opposes the motion of piston when it is moving outwards
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