Q.

Which of the following is true for the calibration of instruments?

A. in casting and fabrication shops the measurements made are of more precise nature as compared to those made in machine shop and tool room
B. periodical calibration is made for optical measuring instruments
C. there is no need of periodic calibration in universal microscope
D. preventive maintenance is not necessary for optical measuring instruments
Answer» B. periodical calibration is made for optical measuring instruments
Explanation: in machine shop and tool room the measurements made are of more precise than those made in casting and fabrication shops, so instruments used in these shops require more frequent calibration. annual programme can be made for periodical calibration and for general preventive maintenance in optical measuring instruments like universal microscope.
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