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Mr. Dubey • 86.20K Points
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Q. Which of the following is used to check change in ocular lines position due to column rotation in universal micrometer?

(A) dial indicator
(B) slip gauges
(C) control shaft
(D) universal microscope
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Explanation by: Mr. Dubey 
 a special control shaft is used to check this where a right angled blade is provided at right angle to shaft diameter line. the ocular line is made to coincide with the blade and the column is titled, the shift in position of the ocular line is noted, this shift is the required error.

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