» Unlabelled » The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.

Saturday, 24 August 2013

The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.

(a)     air  
(b)     hydrogen
(c)     either (a) or (b)
(d)     none of the above

Ans: b

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