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
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
