Question 14General Subjects - 1st Asst/Chief
70% to passAs the speed of an oil lubricated ball bearing increases, fluid friction, due to churning, generates heat. This condition may be avoided by _______________.
Areducing the quantity of lubricant until only a mist of oil is present on the ball bearings
Binstalling oil rings on the ball bearings
Cadding more lubricant until the ball bearings are completely covered with a layer of oil
Dmaintaining a continuous fluid film of oil on the bearings
AI Explanation
The correct answer is A) reducing the quantity of lubricant until only a mist of oil is present on the ball bearings. As the speed of an oil-lubricated ball bearing increases, fluid friction due to churning generates heat. This heat can be avoided by reducing the quantity of lubricant to the minimum needed to maintain a thin, mist-like film on the bearings. This reduces the amount of fluid friction and churning, thereby minimizing heat generation. Options B, C, and D would increase the amount of lubricant, which would actually exacerbate the heat generation problem.
Related Questions
Q409:As a chief engineer, which of the following instructions would most appropriatel... Q405:The "hot stove" rule is sometimes used to illustrate the principles of fair, eff... Q56:Which of the valve arrangements listed would be correct for operating the distil... Q288:Which of the following maintenance criteria would be the basis of planned mainte... Q240:A trainee is on board your vessel and will need to be assessed in the demonstrat...
Ready to test your knowledge?
Take a General Subjects - 1st Asst/Chief Practice ExamOfficial Resources