Static load is defined as the load acting on the bearing when shaft is _____
Explanation: As name suggests, static load means load during stationary position of the shaft.
A total permanent deformation of 0.0001 of the ball diameter is taken for considering static load capacity of the shaft.
Explanation: Permissible magnitude of deformation is set as per the experimental data.
Stribeck equation gives dynamic load capacity of the bearing.
Explanation: It gives static load capacity of the bearing.
Which of the following is expression for stribeck equation?(Number of balls=z)?
Explanation: C=(1/5)zP and P=kd².
The life of an individual ball bearing is the time period for which it works without any signs of failures.
Explanation: It is measured by number of revolutions and not by time.
For majority of bearings, actual life is considerably greater than rated life.
Explanation: Stastically it has been proved that life which 50% of a group of bearings will exceed is approximately five times rating of rated life.
The dynamic load carrying capacity of a bearing is defined as the radial load in radial bearings that can be carried for a minimum life of 1000 revolutions.
Explanation: It is for 1 million revolutions.
In the expression of dynamic load capacity P=XVF(r) + YF(a), V stands for ?
Explanation: It represent race rotation factor which depends upon whether inner race is rotating or outer race.
Calculate the bearing life if expected life for 90% bearings is 9000h and shaft is rotating at 1500rpm.
Explanation: L=60x1500x9000/10⁶ million rev.
The bearing is subjected to a radial load of 4000N. Expected life for 90% bearings is 9000h and shaft is rotating at 1500rpm. Calculate the dynamic load capacity.
A rolling contact bearing is specified as X307. Calculate the bearing diameter.
Explanation: Diameter=5 times the last two digits.
A rolling contact bearing is specified as X307. Determine the series.
Explanation: 1- Extra light series,2-Light series,3-Medium series,4-heavy series.
Needles bearing consist of rollers of small diameter and very small length.
Explanation: Also called as quill bearings, they consist of small diameter and comparatively longer b=rollers.
Extreme pressure causes ______ wear in the bearing parts.
Explanation: Extreme pressure elements in EP additives are added in lubricating oils.
Scoring is a ________ phenomenon.
Explanation: Alternative welding and shearing takes place.