## Marks 1

Which of the bearings given below SHOULD NOT be subjected to a thrust load?

Ball bearings are rated by a manufacturer for a life of $${10^6}$$ revolutions. The catalogue rating of a particular bearing is $$16$$ $$kN.$$ If th...

Which one of the following is criterion in the design of hydrodynamic journal bearings?

The basic load rating of a ball bearing is

To restore stable operating condition in a hydrodynamic journal bearing, when it encounters higher magnitude loads.

In thick film hydrodynamic journal bearings, the coefficient of friction

Spherical roller bearings are normally used

Starting friction is low in

Match the roling element bearings with the most appropriate loading condition
Bearing - type
(a)$$\,\,\,\,\,\,$$ Ball bearing
(b)$$\,\,\,\,\,\,$$ Ro...

If the load on a ball bearing is reduced to half, the life of the ball bearing will

The expected life of a ball bearing subjected to a load of $$9800N$$ and working at $$1000RPM$$ is $$3000$$ hours. What is the expected life of the sa...

## Marks 2

For ball bearings, the fatigue life $$L$$ measured in number of revolutions and the radial load $$F$$ are related by $$F{L^{1/3}} = K,$$ where $$K$$ i...

A hydrodynamic journal bearing is subject to $$2000$$ $$N$$ load at a rotational speed of $$2000$$ $$rpm.$$ Both bearing bore diameter and length are ...

Two identical ball bearings $$P$$ and $$Q$$ are operating at loads $$30kN$$ and $$45kN$$ respectively. The ratio of the life of bearing $$P$$ to the l...

A journal bearing has a shaft diameter of $$40mm$$ and a length of $$40mm.$$ The shaft is rotating at $$20$$ $$rad/s$$ and viscocity of the lubricant ...

A ball bearing operating at a load $$F$$ has $$8000$$hours of life. The life of the bearing, in hours, when the load is doubled to $$2F$$ is

A natural feed journal bearing of diameter $$50mm$$ and length $$50mm$$ operating at $$20$$ revolutions/sec carries a load of $$2kN$$. The lubricant u...

The life of a ball bearing at a load of $$10$$ $$kN$$ is $$8000$$ hours. Its life in hours, if the load is increased to $$20$$ $$kN,$$ keeping all oth...

The dynamic load capacity of $$6306$$ bearing is $$22KN.$$ The maximum radial load it can sustain to operate at $$600$$ $$rev/min,$$ for $$2000$$ hour...

Match the following
List - $${\rm I}$$
(a)$$\,\,\,\,\,$$ Automobile wheel mounting on axle
(b)$$\,\,\,\,\,$$ High speed grinding spindle
(c)$$\,\,\,...