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A double –threaded screw has a pitch of screw 2 mm. How much the screw advances if it is made 3 revolutions?

A double –threaded screw has a pitch of screw 2 mm. How much the screw advances if it is made 3 revolutions? Correct Answer 12

It is given the screw is double- threaded screw which advances to a distance of 2 times the pitch of screw for one complete turn also given pitch of 2 mm. so for one turn the screw advances to 2 x 2mm = 4 mm. The screw is made to turn 3 revolutions so the screw advances to 3 x 4 mm =12 mm.

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