Question

Initial gap between two turns of a close coiled helical tension spring should be

(a) 0.5 mm

(b) based on the maximum deflection

(c) 1 mm

(d) 0

This question was addressed to me in an interview.

Origin of the question is Closely-coiled Helical Spring and Compound Pendulum in section Simple Harmonic Motion of Machine Kinematics

Answer 1

Correct option is (d) 0

For explanation I would say: There is no gap between two turns of a close coiled helical tension spring.