Question

Which of the following is correct about involute curve?

(a) Involute curvature increases with increase in base circle diameter

(b) Involute is straight line when diameter of base circle is zero

(c) Involute curvature increases with increase in pitch circle diameter

(d) Involute curvature decreases with increase in base circle diameter

The question was asked by my college professor while I was bunking the class.

Enquiry is from Involute Curve topic in portion Measurement and Testing of Gears of Engineering Metrology

Answer 1

Right option is (d) Involute curvature decreases with increase in base circle diameter

The best I can explain: The curvature of the involute decreases as the diameter of base circle goes on increasing and when diameter of base circle is infinity then finally involute becomes straight line.