Question

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

This question was posed to me during a job interview.

I need to ask this question from Calibration of Linear and Angular Measuring Instruments topic in portion Testing and Calibration of Gauges and Dynamic Measurement of Engineering Metrology

Answer 1

The correct option is (b) Periodical calibration is made for optical measuring instruments

To elaborate: 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.