Aircraft Reciprocating Engine Lubrication and Cooling Systems

In aircraft reciprocating engines, the cooling system is essential to prevent ______.

• Overheating

• Freezing

• Lubrication

• Ignition

What is the primary purpose of lubrication in an engine?

• To increase friction

• To minimize wear, reduce heat, and improve engine efficiency

• To decrease engine size

• To increase fuel consumption

Which property of reciprocating engine lubricants maintains proper thickness at various temperatures?

• Thermal stability

• High viscosity index

• Corrosion resistance

• Detergent properties

Reciprocating engine lubricants should have ______ to resist breakdown under high heat conditions.

• Corrosion resistance

• Low carbon formation

• Thermal stability

• Detergent properties

What is the purpose of corrosion resistance in reciprocating engine lubricants?

• To maintain proper thickness

• To protect engine parts from rust and oxidation

• To keep the engine clean

• To minimize deposits.

Which property helps keep the engine clean by suspending contaminants?

• Low carbon formation

• High viscosity index

• Detergent properties

• Thermal stability

Low carbon formation in reciprocating engine lubricants is important to ______.

• Protect engine parts from rust

• Minimize deposits that can harm engine performance

• Maintain proper thickness

• Resist breakdown under high heat.

Fill in the blank: The SAE low temperature viscosity measurement at cold temperatures is indicated by the 'Winter' rating, which ranges from 0W to ____.

• 10W

• 15W

• 20W

• 25W

What does 'Viscosity' measure in engine lubricants?

• Temperature

• Resistance to flow

• Density

• Ignition point

The 'Pour point' of an oil is the ______ temperature at which it will flow.

• Highest

• Lowest

• Average

• Constant