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The difference between two consecutive crest/root of a screw is called __________

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The difference between two consecutive crest/root of a screw is called __________

(a) Helix

(b) Mean diameter

(c) Pitch

(d) Revolution

I had been asked this question in an online quiz.

My question is taken from Construction of Evolutes and Helix in chapter Curves used in Engineering Practice of Engineering Drawing

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Correct option is (b) Mean diameter

The explanation: Mean diameter is the average of maximum diameter and the minimum diameter which is caused by the crest and root of screws, bolts etc. revolution is the one complete turn of helix around its own axis.

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