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The constant factor in case of R10 series of preferred numbers is

A. 1.06
B. 1.12
C. 1.26
D. 1.58

Option C

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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	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