Rev Up and Soar: ACE the AMP Aviation Maintenance Technician Powerplant Exam 2025!

Question: 1 / 400

Which of the following helps determine the proper grade of oil to use in a particular engine?

Adequate lubrication in various attitudes of flight

Positive introduction of oil to the bearings

Operating speeds of bearings

The proper grade of oil to use in a particular engine is determined by the operating speeds of bearings. This is because different engines have different bearing tolerances and operating speeds, and using the wrong grade of oil could lead to inadequate lubrication and potential damage to the engine. Options A and B may be important factors to consider for proper lubrication, but they are not the main factor in determining the grade of oil. External temperature is also a consideration, but it is not the primary factor and can vary depending on other factors such as altitude. Therefore, option C is the most important factor in determining the proper grade of oil to use in a particular engine.

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External temperature

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