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Exam (elaborations)

pp203 Questions and Answers 2024/2025

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What are the three oil classifications?  vegetable based, animal based, mineral based Which lube is suitable for aviation?  mineral-based lubricants What are the three types of mineral-based lubricants?  solid, semisolid, fluid Why are mineral based lubricants used for aviation? ...

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  • October 11, 2024
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2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!


pp203 Questions and Answers
2024/2025
What are the three oil classifications?

 vegetable based, animal based, mineral based


Which lube is suitable for aviation?

 mineral-based lubricants


What are the three types of mineral-based lubricants?

 solid, semisolid, fluid


Why are mineral based lubricants used for aviation?

 more chemically stable


Reduces friction, cools, seals, cushions, cleans, protects


 oil functions


A measure of an oils resistance to flow?

 viscosity rating


high temperature

 less viscous


low temperature




1|Page| GradeA+ | 2 0 0 2 5

, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 more viscous


Most oils used in aircraft reciprocating engines have a relatively high viscosity rating

compared to turbine engine oils due to?

 higher operating temperatures and larger clearances


Measures the time in seconds, for 60 cubic centimeters of oil to flow through an accurately

calibrated orifice, at a specific temperature.

 saybolt universal viscometer


Rate of change in viscosity for a given change in temperature


 viscosity index


low change in viscosity for a given temp change

 high vi


high change in viscosity for a given temp change

 low vi


a comparison of the weight of an oil to the weight of an equal volume of distilled water at a

specified temperature

 specific gravity


determined by the amount of light that passes through an oil sample in a glass container when

placed in front of a light of known intensity.



1|Page| GradeA+ | 2 0 0 2 5

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