[Solved] used for setting of helix angles in universal micrometer?

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Q.	used for setting of helix angles in universal micrometer?
A.	1’
B.	2’
C.	3’
D.	4’
Answer» A. 1’
Explanation: the permissible error which is allowed in the entire range of column rotation is ± 5′. a clinometer is used to check this which is of 1′ least count. the clinometer is put over column top. given inclination is further checked with clinometer.

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