If the bearings of a piece of machinery are fed by a gravity feed lubricating oil system, what statement is true concerning the vertical arrangement of the lube oil tanks?

Correct Answer: Option C — The lube oil gravity tank is above the points of lubrication and the lube oil reservoir/sump is below the points of lubrication.

Gravity feed systems rely on potential energy to maintain lubrication pressure. The gravity tank must be positioned above the points of lubrication to provide the necessary head pressure, while the reservoir or sump must be located below the bearings to facilitate the gravity return of the oil for recirculation.