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Bearings dealt with in this module, all have rolling elements consisting of ball or ______.CorrectIncorrect
Because the load is taken on the small contact areas between the balls or rollers and the inner and outer rings of the bearing, this type of bearing is commonly referred to as an_________.CorrectIncorrect
The rolling elements and inner and outer rings or races are made of ________steels to provide the maximum ________to wear and pressure.CorrectIncorrect
The majority of these bearings are used in mechanical power________________applications as supports and as guides for sliding or rolling components.
•Many bearings are found in units, which are not direct parts of a __________transmission system.
•A good example is the type of bearing used to support the rollers in a _________system.A)CONVEYORCorrectIncorrect
Antifriction bearings consist of an inner ring, an outer ring, several __________, and a cage.
•The rolling elements are placed at regular distance between the two rings and are prevented by the_______from coming into contact with one another
•Antifriction bearings are constructed so as to have a smooth ______________movement between the rings.CorrectIncorrect
Bearings are classified into ball bearings and roller bearings according to the shape of the rolling ___________CorrectIncorrect
Bearings are also classified according to the types of load they must bear, e.g. radial or ________thrust loads or a combination of the twoCorrectIncorrect
Scratches and pitmarks
These are normally caused by-sand, metal fillings or any abrasive material in the lubricant, or insufficient lubricationCorrectIncorrect
The following are symptoms of lubrication failure –
•The original colour of the grease turns to a dark shade or a jet-black colour.
•The temperature rises abnormally.
•There is a whistling noise.
•A brownish or bluish discoloration appears on the races and balls.
These faults are normally caused by -•contaminated lubricant, •too much lubricant, •too little lubricant, or•wrong lubricant.
•too much lubricant,
•too little lubricant, or
Clear cracks appear through the races accompanied by excessive noise when the bearing is running.These are normally caused by the bearing fit being too tight on the shaft or in the housing.CorrectIncorrect
This is normally caused by –force incorrectly applied when mounting or dismounting a bearing.CorrectIncorrect
Material comes away from the surface in the form of flakes or scale-like particles and the bearings become excessively hot when running
This is normally caused by –
•contamination in the bearing, or