The immersion method is also known as which method of gear lubrication?

• A. Splash
• B. Direct-Apply
• C. Bath
• D. Mist

Answer: (C)

Immersion lubrication places the gears in a bath of lubricant so they are continuously surrounded by oil as they rotate. The gear teeth are coated by being immersed and carried through the oil, often with circulation to keep the oil clean and at a suitable temperature. This approach provides good cooling and consistent lubrication, which is especially helpful for larger gear sets or steep-load conditions. It’s commonly called the bath method or oil bath lubrication because the gear train essentially operates while submerged in oil.

This differs from splash lubrication, where oil is flung onto surfaces by the rotating gears themselves; direct-apply involves actively brushing or pumping oil onto the teeth; and mist uses a fine oil spray.