Which of the following statements is true...

🔍 Key Concepts

• Trace the flow paths on the diagram for the lube oil coolers, gravity tank, and temperature control valve. • Identify what the gravity tank actually supplies and where its overflow line leads. • Understand how a three‑way temperature control valve normally regulates temperature in a lube oil system.

💭 Think About

• On the diagram, follow the lines connected to the lube oil coolers: do their drains really go to all three places listed in Choice A, or only some of them? • Look carefully at the gravity tank symbol: from its outlet and overflow connections, does it feed the turbines/gears continuously, or does it serve a different/backup purpose? • Find the three‑way valve near the lube oil cooler: is it drawn in the oil side or on the cooling‑water side, and what does that tell you about which medium it bypasses?

✅ Before You Answer

• Verify exactly where the gravity tank overflow line terminates on the drawing. • Confirm whether the normal supply to the turbines and gears comes from the main lube oil pumps or the gravity tank. • Check whether the three‑way valve is routing oil around/through the cooler or routing cooling water around/through the cooler – this is key to evaluating Choice D.

Which of the following statements is true concerning the lube oil system shown in the illustration? Illustration SE-0011

The drains from lube oil coolers can be directed back to the main sump, the sludge tank or the lube oil purifier.

The gravity tank overflow line leads directly to the lube oil sludge tank.

The gravity tank directly provides the normal supply of oil to the turbines and gears.

The three-way temperature control valve bypasses cooling water around or through the lubricating oil cooler to maintain the desired oil temperature.

🔍 Key Concepts

💭 Think About

✅ Before You Answer