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Pitch of helix is 7 mm and the number of revolutions is 15. Length of spring is?

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Pitch of helix is 7 mm and the number of revolutions is 15. Length of spring is?

(a) 100 mm

(b) 10.5 cm

(c) 110 mm

(d) 12 cm

The question was posed to me by my school teacher while I was bunking the class.

This key question is from Helix upon a Cone topic in section Curves used in Engineering Practice of Engineering Drawing

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Correct answer is (b) 10.5 cm

Easy explanation: Length of spring = pitch of helix x number of revolutions, 7 mm x 15 = 0.7 cm x 15 = 10.5 cm = 105 mm. Length also includes a diameter of wire but here it is not mentioned and also not given the diameter of a wire.

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