Question

# Brown and sharp indexing plates used in indexing will have the following hole circles. Plate 1 : 15, 16, 17, 18, 19, 20 Plate 2 : 21, 23, 27, 29, 31, 33 Plate 3 : 35, 37, 39, 41, 43, 47, 49 The plates which can be used for producing 23 divisions on the job using simple indexing is

A
1 only
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B
2 only
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C
2 & 3 only
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D
1, 2 & 3
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Solution

## The correct option is B 2 onlyCrank rotation C.R. =40N where N = Number of divisions by which the circumference of the job is to be divided. =4023=11713⇒ Not possible Therefore, 23 divisions can be done only by using plate 2.

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