CPL Acft Tech - Lubrication & cooling systems

Select the main functions of oil in an engine

• lubrication

• cooling

• cleaning

• anti-knock

True or False?

A wet sump oil system does not have a separate oil storage tank.

• True

• False

As the temperature of oil increases...

• its viscosity increases and it flows more readily

• its viscosity decreases and it flows more readily

• its viscosity increases and it flows more slowly

• its viscosity decreases and it flows more slowly

The type of oil used in an aircraft engine is...

• ashless dispersant

• mineral

• detergent

• straight 80

A disadvantage of detergent oils is that they...

• form metallic ash compounds

• have a low boiling point

• are prone to oxidation

• have a high viscosity

A disadvantage of mineral oils is that they...

• form metallic ash compounds

• have a low boiling point

• are prone to oxidation

• have a high viscosity

An oil with an SAE rating of 40 will have a commercial aviation number of...

• 20

• 40

• 60

• 80

In an oil system, a pressure relief valve is incorporated so that...

• oil is maintained at a constant pressure in the system

• if the oil filter becomes blocked, it can be bypassed

• if the oil cooler becomes blocked, it can be bypassed

The most likely cause of a high oil pressure is...

• a faulty pressure relief valve

• an engine fire

• low oil temperature

• high oil temperature

If the oil pressure falls gradually, and the oil temperature rises, this is an indication that...

• the oil system is losing oil

• there is a slow but developing engine fire

• the pressure relief valve is stuck open

• the bypass valve is stuck open