Question

A spring controlled governor is said to be isochronous when the controlling force

(a) increases as the radius of rotation decreases

(b) increases as the radius of rotation increases

(c) decreases as the radius of rotation decreases

(d) remains constant for all radii of rotation

This question was posed to me in an interview for job.

Query is from Hartnell Governor in section Governors of Machine Dynamics

Answer 1

Correct choice is (d) remains constant for all radii of rotation

To elaborate: For the governor to be stable, in spring controlled governor, the controlling force must increase as the radius of rotation increases.

A spring controlled governor is said to be isochronous when the controlling force remains constant for all radii of rotation.