Q.

What is the value of the limited depth to which form errors, tapers, looping can be corrected?

A. 10 microns
B. 20 microns
C. 30 microns
D. 40 microns
Answer» B. 20 microns
Explanation: form errors, tapers, looping etc.., can be corrected up to a limited depth of 20 microns.
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