Question

Up to which angle sine bars can measure the angles?

(a) 45 degree

(b) 60 degree

(c) 90 degree

(d) 120 degree

This question was posed to me in an internship interview.

The query is from Sine Principle and Sine Bars topic in division Angular Measurement and Circular Division of Engineering Metrology

Answer 1

Right answer is (a) 45 degree

Explanation: The sine bars become impractical and inaccurate as the angle exceeds 45° because the bar is physically clumsy to hold in that position and even a slight error of the sine bar can cause large angular errors after this angle.