250. Which of the following statements is true concerning the lube oil system shown in the illustration

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.

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