M15.9 Lubrication and Fuel

The types water present in aviation fuel are:

• Free that is harmless and entrained that is harmful

• Free and entrained both being harmful

• Free that is harmful and entrained that is harmless

Microbiological contamination usually appears as:

• Black slime floating on the surface of the fuel

• Green slime evenly distributed in the fuel

• Brown slime on the floor of the fuel tank

The two types of fuel normally used in Turbine Engines are:

• Kerosene and wide cut gasoline

• Gasoline and wide range kerosene

• Kerosene and low cut gasoline

DERD 2494 (JET A1) is:

• Wide cut gasoline

• Kerosene

• Wide cut kerosene

The lubricating oil used in Turbine Engine is:

• Mineral based oil

• Vegetable based oil

• Synthetic Oil

A high viscosity index means that:

• The viscosity will vary a lot with temperature change

• The viscosity will not vary a lot with temperature change

• The viscosity is high

Synthetic oils have:

• A low evaporation rate and high flash point

• A high evaporation rate and low flash point

• A low evaporation rate and low flash point

Type 1 and Type 2 turbine lubricating oil

• Are fully compatible and may be mixed

• Are not compatible and cannot be mixed

• Can only be substituted for each other in an emergency

If the specific gravity of a fuel is increased, the weight of a tank of fuel will

• decrease

• remain the same

• increase

Which of the characteristics is desirable in turbine engine oil?

• High volatility

• High flash point

• Low flash point