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Mean diameter of the coil is given as 100 mm and diameter of the wire is 5 mm. Spring index is________

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Mean diameter of the coil is given as 100 mm and diameter of the wire is 5 mm. Spring index is________

(a) 40

(b) 30

(c) 25

(d) 20

I had been asked this question in my homework.

This interesting question is from Construction of Helical Springs in chapter Curves used in Engineering Practice of Engineering Drawing

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The correct choice is (d) 20

For explanation I would say: Spring index is the ratio of the mean diameter of a coil to diameter of the wire. Spring index = 100mm / 5 mm =20. Spring index does not have units since it is a ration of similar units.

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