For a ball bearing, the fatigue life in millions of revolutions is given by L = (c/P)ⁿ. In which scenario is n equal to 3?

N = 3, assuming that the outer racing is fixed and inner racing is revolving.

Fill in the blanks: The ______ is defined as the life of a group of apparently identical ball or roller bearings, in number of revolutions or hours, rotating at a given speed.

Rating life

True or False: The equivalent radial load (Pe) accounts for both axial and radial loads on a bearing.

True

What is the relationship between the diameters of the inner core (di) and the outer rim (do) in a composite shaft if do = 2di?

The external diameter is twice the inner diameter.

Riddle: I can support heavy loads with a thin film, my operation is smooth, yet without me, there’s friction and wear. What am I?

Fluid film bearing

The maximum shear stress in a journal bearing can be expressed in terms of the applied load and the geometry of the bearing. What is the term used for this shear stress?

Bearing pressure

In the context of bearing design, what does the Sommerfeld number (S) encompass?

It includes design parameters like bearing dimensions, friction, viscosity, and speed of rotation.

Fill in the blanks: Rolling contact bearings are also known as ______ due to their low friction characteristics.

Anti-friction bearings

True or False: The pressure rating of lead-based babbitts exceeds 14 MPa.

False. The pressure rating does not exceed 14 MPa.

What is the primary purpose of the converging zone in a fluid film bearing?

To build up positive pressure in the fluid film to support the load.

Which of the following is a method for designing journal bearings? A) FEA B) Dimensional analysis C) Finite difference method D) Computational fluid dynamics

B) Dimensional analysis

Fill in the blanks: The basic dynamic load rating is the load that a group of apparently identical bearings can withstand for a rating life of ______ revolutions.

One million