Question

Which of the following is correct about brookes level comparator?

(a) It is used for sub-division of length standard

(b) Must be kept at temperature 10^oC for correct readings

(c) A very accurate spirit level is used

(d) Spirit level makes line contact on gauges

This question was posed to me during a job interview.

My doubt stems from End Standards in section Standards of Measurements of Engineering Metrology

Answer 1

Right answer is (c) A very accurate spirit level is used

Explanation: It is used for sub-division of end standards. It is important to keep the room temp constant. This is important because some metals suffer a change in length when the temp is varied. Room must be kept at 20^oC.