1. Friction moment is independent of the number of collars. |
2. The intensity of pressure is affected by the number of collars. |
3. Coefficient of friction of the bearing surface is affected by the number of collars. |
A) 1 and 2
B) 1 and 3
C) 2 and 3
D) 1, 2 and 3
Correct Answer: A
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