Question

What is the primary consideration in the accuracy of precision polygons?

(a) How closely the mirror agrees with nominal angle

(b) How closely the reflecting surface agrees with nominal angle

(c) Primary consideration for precision polygons is how square and flat it is or its surface

(d) How many sides polygon has having

I had been asked this question in an online interview.

This is a very interesting question from Precision Polygons topic in chapter Angular Measurement and Circular Division of Engineering Metrology

Answer 1

Right choice is (c) Primary consideration for precision polygons is how square and flat it is or its surface

To explain I would say: The primary consideration in accuracy for the certainty of calibration is not how closely reflecting faces or mirror agrees with the nominal angle, but how flat and square it is.