Prepare for the Engineman EN A School Test 1. Utilize flashcards and multiple choice questions with detailed explanations to boost confidence and readiness for the test.

Multiple Choice

What is the function of a fuel-oil purifier?

Fuel-oil purifiers work by using centrifugal force to remove water and impurities from fuel oil before it enters the engine. As the fuel spins in the purifier, the heavier water and sediment separate from the oil and drain away, while the cleaner oil rises to the top to be sent on to the engine. This keeps the fuel system—pumps, filters, and injectors—protected from wear, corrosion, and clogging. Heating the fuel to adjust viscosity is a separate step, but the purifier’s main job is to strip out water and impurities rather than change viscosity.

Fuel-oil purifiers work by using centrifugal force to remove water and impurities from fuel oil before it enters the engine. As the fuel spins in the purifier, the heavier water and sediment separate from the oil and drain away, while the cleaner oil rises to the top to be sent on to the engine. This keeps the fuel system—pumps, filters, and injectors—protected from wear, corrosion, and clogging. Heating the fuel to adjust viscosity is a separate step, but the purifier’s main job is to strip out water and impurities rather than change viscosity.