Question

Why are square threaded screws are used in the machines?

(a) Large forces act along the axis of the screws

(b) Small forces act along the axis of the screws

(c) Large forces act perpendicular the axis of the screws

(d) Small forces act perpendicular the axis of the screws

I had been asked this question during an interview.

My doubt is from Frictional Forces on Screws in portion Friction of Engineering Mechanics

Answer 1

Right option is (a) Large forces act along the axis of the screws

The explanation: The square threaded screws are used in the machines. As these screws are generally used as the fasteners. The main thing about these screws is that the friction helps the holding of the structures. Also, screws help make the structure join fast and efficiently. And in these screws forces act along the axis of screws.