Q.

What is the maximum permissible error in wear of centres?

A. 0.04 mm
B. 0.03 mm
C. 0.02 mm
D. 0.01 mm
Answer» D. 0.01 mm
Explanation: the centres are set and checked for straightness. it can be observed while rotating the centres. the maximum error permissible for wear of centres is 0.01 mm.

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