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The ball bearings are provided with a cage

A. to reduce friction
B. to facilitate slipping of balls
C. to prevent the lubricant from flowing out
D. to maintain the balls at a fixed distance apart

Option D

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The value of stress concentration factor depends upon A. material of the part B. geometry of the part C. material and geometry of the part D. none of these	The velocity of sliding __________ the distance of the point of contact from the pitch point. A. is directly proportional to B. is inversely proportional to C. is equal to cos φ multiplied by D. does not depend upon