Question

Which of the following is not reason for arranging locking nuts?

(a) to get rid of slack while vibrations in machines

(b) to get rid from the loosing of connected parts

(c) for more protection and security

(d) to get rid of screwing off the bolts

The question was asked during an interview.

This intriguing question comes from Locking Arrangements for Nuts topic in chapter Screw Threads & Screwed Fastening of Engineering Drawing

Answer 1

Correct option is (c) for more protection and security

The explanation is: There is always a tendency for the nuts to get slack and to screw off the bolts slightly. The connected parts might get loose, and lead to a serious breakdown. It is, therefore, desirable to secure the nut in some way so as to prevent it from getting loose.