Oil Flow Measurement Quiz & Flashcards on Aircraft Lubricants

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Questions and Answers

What is the main characteristic of a lubricating oil's viscosity?

Its rate of flow through an orifice at a standard temperature

Its rate of change in viscosity with temperature change (correct)

Its resistance to flow at a standard temperature

Its specific gravity

Compared to reciprocating engine oils, which characteristic is more prominent in turbine engine oils?

Higher flash point

Less tendency to produce lacquer or coke (correct)

Higher viscosity index

Greater demulsibility

What is the primary function of engine oil, apart from lubricating?

Cooling and sealing

Cooling, sealing, preventing corrosion, and cushioning shock loads (correct)

Cushioning shock loads and preventing corrosion

Preventing corrosion only

What determines the proper grade of oil to use in a particular engine?

Operating speeds of bearings Signup and view all the answers

What is specific gravity a measure of?

Weight of a substance compared to an equal volume of distilled water Signup and view all the answers

What is an advantage of mineral base lubricants over vegetable oil base lubricants in aircraft engines?

Chemical stability Signup and view all the answers

What type of lubricant is required for high tooth pressures and high rubbing velocities, such as occur with spur type gears?

E.P lubricant Signup and view all the answers

What is a desirable characteristic of turbine engine oil?

High flash point Signup and view all the answers

What is done to protect integral fuel tanks from corrosion due to micro biological contamination?

A biocidal additive is added to the fuel Signup and view all the answers

What is the ideal oil for achieving theoretically perfect engine lubrication?

The thinnest oil that will stay in place and maintain a reasonable film strength Signup and view all the answers

What parameter needs to be adjusted when switching to an alternate fuel in a turbine engine?

Fuel specific gravity setting Signup and view all the answers

Why is kerosene used as a turbine engine fuel?

It has more heat energy per gallon and lubricates fuel system components Signup and view all the answers

What is calorific value a measure of?

The amount of heat or energy in one pound of fuel Signup and view all the answers

What type of oil is commonly used in gas turbine engines?

Synthetic oil Signup and view all the answers

What does an oil spectroscope measure?

Contaminants suspended in the oil Signup and view all the answers

What factors affect the ignition of fuel in a turbine engine?

Both volatility and atomisation Signup and view all the answers

Why is kerosene preferred over gasoline in turbine engines?

Kerosene is less volatile and has good lubrication properties Signup and view all the answers

What happens to the weight of a tank of fuel when its specific gravity is increased?

It increases Signup and view all the answers

What is the temperature at which the Reid vapour pressure of a fuel is measured?

38°C Signup and view all the answers

Which of the following is affected by the specific gravity of fuel?

Aircraft range Signup and view all the answers

At what air/fuel ratio will kerosene burn effectively?

15:1 Signup and view all the answers

What should be done with Prist or Biopor during use?

It is left and burnt with the fuel. Signup and view all the answers

What does D.E.R.D 2494 refer to?

Kerosene Signup and view all the answers

What does a high viscosity index indicate about oil viscosity?

It will not vary greatly with temperature change. Signup and view all the answers

What is the function of a fuel system icing inhibitor?

It prevents the water in the fuel from freezing. Signup and view all the answers

What is the likely outcome of using a lubricant recommended for lower temperatures in extremely high-temperature conditions?

The oil pressure will be lower than normal. Signup and view all the answers

Which measurement indicates the flow characteristics of oil through an orifice?

The time required for a specific volume to flow. Signup and view all the answers

What happens to oil pressure when an engine is run in extremely high temperatures with an inappropriate lubricant?

The oil pressure will be lower than normal. Signup and view all the answers

Study Notes

Lubricants and Fuels

Kerosene and Fuels

Kerosene burns effectively at an air/fuel ratio of 15:1.
D.E.R.D 2494 is a type of kerosene.
Kerosene has more heat energy per gallon and lubricates fuel system components, making it a suitable turbine engine fuel.

Lubricants and Viscosity

Viscosity is the measure of a liquid's resistance to flow.
High viscosity index means the oil viscosity will not vary greatly with temperature change.
The time in seconds required for exactly 60 cubic centimeters of oil to flow through an accurately calibrated orifice at a specific temperature is recorded as a measurement of the oil's viscosity.
Viscosity index is based on the rate of change in viscosity with temperature change.
A high viscosity index is desirable in turbine engine oil.

Functions of Engine Oil

Engine oil performs functions in addition to lubricating, including cooling, sealing, preventing corrosion, and cushioning shock loads.

Oil Types and Characteristics

Mineral base lubricants have chemical stability, which is an advantage over vegetable oil base lubricants in aircraft engines.
Synthetic oil is usually used in gas turbine engines.
An E.P lubricant is required for high tooth pressures and high rubbing velocities in spur type gears.

Fuel System and Corrosion

A biocidal additive is added to fuel to protect integral fuel tanks from corrosion due to micro-biological contamination.
Specific gravity of fuel affects aircraft range; a higher specific gravity means a greater weight of fuel for a fixed volume, resulting in a greater range.

Turbine Engine Performance and Fuel

Calorific value is the amount of heat or energy in one pound of fuel.
Ignition of fuel depends on both volatility and atomisation.
Kerosene is used instead of gasoline because it is less volatile and has good lubrication properties.

Oil Analysis and Contaminants

An oil spectroscope measures contaminants suspended in the oil.
Oil sampling by spectrometer analysis is used to detect contaminants in the oil.

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Description

Quiz on aircraft fuels and lubricants, including kerosene air/fuel ratios and Prist/Biopor usage in gas turbine powerplants.

Aircraft Fuels and Lubricants

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