Question

A multiple-threaded screw has a pitch of screw 4mm and if the screw is made to 5 revolutions the screw will advances to 40 mm. What type of screw is it?

(a) Single-threaded screw

(b) Double threaded screw

(c) Triple-threaded screw

(d) Four –threaded screw

This question was posed to me during an internship interview.

This key question is from Construction of Screw Threads in division Curves used in Engineering Practice of Engineering Drawing

Answer 1

The correct option is (b) Double threaded screw

The best explanation: 5 revolutions = 40 mm, 1 revolution = 40mm/5 = 8 mm. Given pitch of the screw is 4 mm that is a pitch of the helix is equal to two times of pitch of the screw. So the screw used here is double-threaded screw.