What is the property of material for the application of fractional-horsepower motor bearings?

What is the property of material for the application of fractional-horsepower motor bearings? Correct Answer High porosity

The material which has high porosity that is which has the more pore volume which also has a maximum amount of lubricating oil is used for fractional-horsepower motor bearings.

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Ball bearings are preferred over other types of bearings for machines rated up to 75 kW. Which of the following is not true for ball bearings?