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One of the index plates of a milling machine dividing head has the following hole circles 15;16;17;18;19;20

A gear wheel of 34 teeth has to be milled by simple indexing method To machine each tooth the index crank has to rotated through                           

(a) 17 holes in the 20 hole circle

(b) 18 holes in the 20 hole circle

(c) 1 revolution and 3 holes in 17 – hole circle

(d) 1 revolution and 2 holes in 18 – hole circle

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