Engine Lubrication Systems

How is the oil collected by the piston oil ring returned to the crankcase?

• Down vertical slots cut in the piston wall between the piston oil ring groove and the piston skirt.

• Through holes drilled in the piston pin recess.

• Through holes drilled in the piston oil ring groove.

In addition to lubricating (reducing friction between moving parts), engine oil performs what functions?

1.Cools.

2.Seals.

3.Cleans.

4.Prevents corrosion.

5.Cushions impact (shock) loads.

• 1, 2, 3, 4, 5.

• 1, 2, 3, 4.

• 1, 3, 4.

In a reciprocating engine oil system, the temperature bulb senses oil temperature

• while the oil is in the hottest area of the engine.

• immediately before the oil enters the oil cooler.

• at a point after the oil has passed through the oil cooler.

Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by

• the design and shape of the piston skirt.

• internal engine pressure bleeding past the ring grooves.

• oil control rings on the pistons.

What is the purpose of the last chance oil filters?

• To assure a clean supply of oil to the lubrication system.

• To prevent damage to the oil spray nozzle.

• To filter the oil immediately before it enters the main bearings.

Oil accumulation in the cylinders of an inverted in line engine and in the lower cylinders of a radial engine is normally reduced or prevented by

• routing the valve operating mechanism lubricating oil to a separate scavenger pump.

• reversed oil control rings.

• extended cylinder skirts.

What is the primary purpose of the oil breather pressurization system that is used on turbine engines?

• Provides a proper oil spray pattern from the main bearing oil jets.

• Allows aeration of the oil for better lubrication because of the air/oil mist.

• Prevents foaming of the oil.

Which of the following is a function of the fuel oil heat exchanger on a turbojet engine?

• Increases fuel temperature.

• Emulsifies the oil.

• Aerates the fuel.

Which type valve prevents oil from entering the main accessory case when the engine is not running?

• Check valve.

• Relief valve.

• Bypass valve.

The recommended aircraft engine lubricants are

• vegetable, mineral, or synthetic based.

• animal, mineral, or synthetic based.

• mineral or synthetic based.