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The rolling contact bearings as compared to sliding contact bearings have A. small overall dimensions B. accuracy of shaft alignment C. low starting and low running friction except at very high speeds D. all of the above
The endurance limit for a mirror polished material will be __________ as compared to unpolished material. A. same B. less C. more
The maximum normal stress theory is used for A. brittle materials B. ductile materials C. plastic materials D. non-ferrous materials
The bearings of heavy series have capacity __________ over the medium series. A. 10 to 20% B. 20 to 30% C. 30 to 40% D. 40 to 50%
Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that A. shaft B is better than shaft A B. shaft A is better than shaft B C. both the shafts are equally good
Which of the following statement is correct for gears? A. The addendum is less than dedendum B. The pitch circle diameter is equal to the product of module and number of teeth C. The pitch circle is always greater than the base circle D. all of the above
The constant factor in case of R10 series of preferred numbers is A. 1.06 B. 1.12 C. 1.26 D. 1.58
In order to obtain the bolts of uniform strength, an axial hole is drilled through the head as far as the threaded portion such that the area of shank becomes equal to the root area of the thread. A. True B. False
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 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
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