The normal value of adhesion friction is______________?
Correct answer: B. 0.25
- A. 0.12
- B. 0.25
- C. 0.40
- D. 0.75
Explanation
A normal wheel-to-rail coefficient of adhesion is commonly taken as about 0.25 under ordinary conditions. Sand can raise it, while moisture or oil can reduce it considerably.
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