Question 120Motor Plants - Assistant Engineer

The correct answer is B) supply lubricating oil for actuating the exhaust valve. The line identified as "I" in the illustration MO-0066 is used to supply lubricating oil to the exhaust valve actuating device. This is necessary to ensure the smooth and efficient operation of the exhaust valve, which is a critical component in the engine's functioning. The other answer choices are incorrect because they do not accurately describe the purpose of the line labeled "I". Option A is incorrect as it refers to fuel oil delivery, which is not the function of this line. Option C is incorrect as it refers to cooling water, which is not the purpose of this particular line. Option D is incorrect as it refers to exhaust gas and vapors, which are not transported through this line.