Question

For a triple threaded screw the pitch of the screw is 5 mm. The lead (pitch of helix) is______

(a) 15

(b) 8

(c) 10

(d) 30

I got this question by my school principal while I was bunking the class.

Asked question is from Construction of Screw Threads topic in division Curves used in Engineering Practice of Engineering Drawing

Answer 1

Correct choice is (a) 15

Explanation: In a Double-threaded screw, Pitch of the helix = lead = Twice the pitch of the screw, similarly in a triple-threaded screw, pitch of the helix = lead = Thrice the pitch of the screw and so on. Lead = 3 x 5 mm = 15 mm.