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For a Double-threaded screw, Pitch of the helix = lead = ______ the pitch of the screw.

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For a Double-threaded screw, Pitch of the helix = lead = ______ the pitch of the screw.

(a) Four times

(b) Thrice

(c) Twice

(d) One time

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This interesting question is from Construction of Screw Threads topic in portion Curves used in Engineering Practice of Engineering Drawing

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Correct choice is (c) Twice

Easy explanation: In double-threaded screws, two threads of the same size run parallel to each other. The axial advance per revolution namely the lead is made twice the lead of the single-threaded screw, the pitch of the thread being kept the same in both cases.

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