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Air Cooling
What type of cooling system uses air from the atmosphere to cool the engine?
Hot water
In a convection heating system, what rises to the top?
Additives
What property helps reciprocating engine lubricants resist oxidation?
Centrifugal Pump
What device is used to circulate water in a cooling system?
Weight of a substance to distilled water
What does specific gravity compare?
Viscosity
What does oil's ability to hold particles in suspension refer to?
Rubbing of surfaces
What is friction?
Resistance to flow
What is viscosity?
Acts as a cushion
What does lubricant do between metal parts?
Thickness of oil
What does viscosity grade indicate?
Temperature effect on viscosity
What does the viscosity index number indicate?
Viscosimeter
What instrument measures viscosity?
Flexibility in temperature
What is a benefit of multi-grade oils?
Kinetic Friction
What type of friction must lubricants withstand extreme loads?
Society of Automotive Engineers
What does SAE stand for?
To reduce friction
What is the primary purpose of lubricant?
To reduce friction
What is the primary purpose of lubricants in aviation?
Thermal stability
Which characteristic of aviation lubricants helps them perform well at high altitudes?
Additives
What property of lubricants helps them protect against corrosion in aircraft engines?
To maintain performance in cold temperatures
Why is it important for aviation lubricants to have a low freezing point?
Low viscosity
What characteristic ensures that aviation lubricants can flow easily during start-up?
They must reduce friction
What is the primary requirement for aviation reciprocating engine lubricants?
To prevent breakdown at high temperatures
Why must lubricants for reciprocating engines have good thermal stability?
Low viscosity
Which characteristic is important for lubricants to maintain proper flow during cold starts?
To protect engine components from wear
Why is it essential for reciprocating engine lubricants to have good anti-wear properties?
True
The best oil for most purposes is one that maintains a constant viscosity throughout temperature changes
True
Higher temperatures also lower the volumetric efficiency of the engine
False
AirCooled Engines Produce less aerodynamic noise
True
Cooling system should be capable of removing about % of the heat generated in the combustion chamber while maintaining the optimum temp of the engine under all operating conditions of the engine
True
The viscosity of the oil is affected by temperature
False
W used in end of the grade or weight number that indicates the oil is of the ashless dispersant type
False
The oil becomes thick at high temperatures and thin at low temperatures
True
At temperatures below °F, preheating of the engine and oil supply tank is normally required regardless of the type of oil used
True
Approved preservative lubricating oil should be removed at end of the first hours of operation
True
Oil cooling can account for up to percent of the total engine cooling and is an excellent medium to transfer the heat from the engine to the oil cooler
True
Lubrication forms an oil film between two moving surfaces
True
SAE ratings are not purely arbitrary and bear direct relationship to the Saybolt or other ratings
True
The oil that flows slowly is viscous or has a high viscosity; if it flows freely, it has a low viscosity
False
Cloud point and Pour point are established for engine oils to determine that they can withstand the high temperatures encountered in an engine
True
The first additives incorporated in straight mineral piston engine oils were based on the metallic salts of barium and calcium
Note 
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