Bearings

A shaft carries a helical spur gear. Which one of the following bearings can NOT be used to support it?

For a ball bearing, the fatigue life in millions of revolutions is given by $L = \left(\frac{C}{P}\right)^n$, where $P$ is the constant applied load and $C$ is the basic dynamic load rating. Which one of the following st...

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

A hydrodynamic journal bearing is subject to $$2000$$ $$N$$ load at a rotational speed of $$2000$$ $$rpm.$$ Both bearing bore diameter and length are $$40mm.$$ If radial clearance is $$20\mu m$$ and bearing is lubricated...

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 the design load is $$2$$ $$kN,$$ the life of the bearing will be $$P \time...

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 life of bearing $$Q$$ is

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 is $$20mPa.s.$$ The clearance is $$0.020mm.$$ The loss of the torque d...

A natural feed journal bearing of diameter $$50mm$$ and length $$50mm$$ operating at $$20$$ revolutions/sec carries a load of $$2kN$$. The lubricant used has a viscosity of $$20mPa$$-$$s$$. The radial clearance is $$50\m...

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

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

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 other conditions same, is

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.

Match the following List - $${\rm I}$$ (a)$$\,\,\,\,\,$$ Automobile wheel mounting on axle (b)$$\,\,\,\,\,$$ High speed grinding spindle (c)$$\,\,\,\,\,$$ $${\rm IC}$$ - Engine connecting rod (d)$$\,\,\,\,\,$$ Leaf sprin...

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

In thick film hydrodynamic journal bearings, the coefficient of friction

Spherical roller bearings are normally used

Match the roling element bearings with the most appropriate loading condition Bearing - type (a)$$\,\,\,\,\,\,$$ Ball bearing (b)$$\,\,\,\,\,\,$$ Roller bearing (c)$$\,\,\,\,\,\,$$ Needle bearing (d)$$\,\,\,\,\,\,$$ Tape...

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 same bearing for a similar load of $$4900$$ $$N$$ and a speed of $$2000r...