Question

For very low velocities of rotation, high loads, and with good lubrication can be taken as

(a) 0.008 to 0.02

(b) 0.07 to 0.15

(c) 0.05 to 0.80

(d) none of the mentioned

I got this question in a national level competition.

Enquiry is from Limiting Angle of Friction topic in section Friction of Machine Kinematics

Answer 1

The correct option is (b) 0.07 to 0.15

For explanation: For very low velocities of rotation, high loads, and with good lubrication can be taken as 0.07 to 0.15.

For design of ordinary machinery, value of journal friction can be taken as 0.008 to 0.02.