DGCA & EASA Module 15 : Part-9 Lubricants and Fuels Of GTE Question

DGCA & EASA Module 15 : Part-9 Lubricants and Fuels Of GTE Question-Answer


1. Kerosene will burn effectively at an air/fuel ratio of.
A. 150:1.
B. 15:1.
C. 45:1.
Ans : 15:1.
Explanation: NIL.



2. When using Prist or Biopor.
A. it is left and burnt with the fuel.
B. it is diluted with water to a 3-1 mix.
C. it is flushed out immediately.
Ans : it is left and burnt with the fuel.
Explanation: Jepperson Gas Turbine Powerplants Page 7-2 refers.

3. What is D.E.R.D 2494?.
A. Oil.
B. Wide cut gasoline.
C. Kerosene.
Ans : Kerosene.
Explanation: Jeppesen Aircraft Gas Turbine Power plant page 7-1 refers.

4. A high viscosity index means the oil viscosity.
A. will vary greatly with temperature change.
B. has a large index number.
C. will not vary greatly with temperature change.
Ans : will not vary greatly with temperature change.
Explanation: Jeppesen Aircraft Gas Turbine Powerplant Page 6-2 Refers.

5. A fuel system icing inhibitor is a fuel additive which.
A. prevents both the water and the fuel freezing.
B. prevents the fuel from freezing.
C. prevents the water in the fuel freezing.
Ans : prevents the water in the fuel freezing.
Explanation: Jeppesen Gas Turbine Powerplants Page 7-2 refers.

6. What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?.
A. The oil pressure will be lower than normal.
B. The oil temperature and oil pressure will be higher than normal.
C. The oil pressure will be higher than normal.
Ans : The oil pressure will be lower than normal.
Explanation: NIL.

7. 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.
A. specific gravity.
B. flash point.
C. viscosity.
Ans : viscosity.
Explanation: NIL.

8. Upon what quality or characteristic of a lubricating oil is its viscosity index based?.
A. Its rate of flow through an orifice at a standard temperature.
B. Its rate of change in viscosity with temperature change.
C. Its resistance to flow at a standard temperature as compared to high grade paraffin base oil at the same temperature.
Ans : Its rate of change in viscosity with temperature change.
Explanation: NIL.

9. Compared to reciprocating engine oils, the types of oils used in turbine engines.
A. are required to carry and disperse a higher level of combustion by-products.
B. have less tendency to produce lacquer or coke.
C. may permit a somewhat higher level of carbon formation in the engine.
Ans : have less tendency to produce lacquer or coke.
Explanation: Jeppesen A&P Technician Propulsion Textbook 9-25.

10. If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?.
A. An oil that combines high viscosity and low demulsibility.
B. The thinnest oil that will stay in place and maintain a reasonable film strength.
C. An oil that combines a low viscosity index and a high neutralization number.
Ans : The thinnest oil that will stay in place and maintain a reasonable film strength.
Explanation: NIL.

11. In addition to lubricating (reducing friction between moving parts), engine oil performs what functions?.
A. Cools, seals, prevents corrosion.
B. Cools, seals, prevents corrosion, cushions shock loads.
C. Cools and seals.
Ans : Cools, seals, prevents corrosion, cushions shock loads.
Explanation: NIL.

12. The viscosity of a liquid is a measure of its.
A. weight, or density.
B. rate of change of internal friction with change in temperature.
C. resistance to flow.
Ans : resistance to flow.
Explanation: NIL.

13. Which of the following factors helps determine the proper grade of oil to use in a particular engine?.
A. Adequate lubrication in various attitudes of flight.
B. Operating speeds of bearings.
C. Positive introduction of oil to the bearings.
Ans : Operating speeds of bearings.
Explanation: NIL.

14. Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of.
A. oil at a specific temperature.
B. mercury at a specific temperature.
C. distilled water at a specific temperature.
Ans : distilled water at a specific temperature.
Explanation: NIL.

15. What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?.
A. Cooling ability.
B. Chemical stability.
C. Friction resistance.
Ans : Chemical stability.
Explanation: NIL.

16. High tooth pressures and high rubbing velocities, such as occur with spur type gears, require the use of.
A. an E.P lubricant.
B. metallic ash detergent oil.
C. straight mineral oil.
Ans : an E.P lubricant.
Explanation: NIL.

17. Which of these characteristics is desirable in turbine engine oil?.
A. High volatility.
B. High flash point.
C. Low flash point.
Ans : High flash point.
Explanation: Jeppesen A&P Technician Propulsion Textbook 9-25.

Click Here For : DGCA & EASA Module 15  : Part-10 Engine Lubrication Systems Question

18. What action is taken to protect integral fuel tanks from corrosion due to micro biological contamination?.
A. Rubber liners are installed in the tank.
B. A biocidal additive is added to the fuel.
C. The inside of the tank is coated with yellow chromate.
Ans : A biocidal additive is added to the fuel.
Explanation: Jeppesen Aircraft Gas Turbine Powerplant Page 7-2 refers.

19. What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?.
A. Maximum RPM adjustment.
B. Fuel specific gravity setting.
C. EPR gauge calibration.
Ans : Fuel specific gravity setting.
Explanation: NIL.

20. Kerosene is used as turbine engine fuel because.
A. kerosene has more heat energy per gallon and lubricates fuel system components.
B. kerosene has very high volatility which aids in ignition and lubrication.
C. kerosene does not contain any water.
Ans : kerosene has more heat energy per gallon and lubricates fuel system components.
Explanation: NIL.

21. Calorific value is the.
A. amount of heat or energy in one pound of fuel.
B. vaporisation point of fuel.
C. fuel boiling temperature.
Ans : amount of heat or energy in one pound of fuel.
Explanation: Measured in M.J/Kg or BTU/Lb.

22. The specific gravity of fuel affects.
A. thrust rating.
B. aircraft range.
C. engine efficiency.
Ans : aircraft range.
Explanation: Greater Density for a fixed volume equals greater weight of fuel - hence greater range.

23. Oil used in a gas turbine engine is usually.
A. mineral.
B. natural.
C. synthetic.
Ans : synthetic.
Explanation: Rolls Royce the Jet Engine Page 83 refers.

24. An oil spectroscope measures.
A. contaminants suspended in the oil.
B. S.G. of the oil.
C. contaminants in the surface of the oil.
Ans : contaminants suspended in the oil.
Explanation: See Jeppesen Aircraft Gas Turbines Page 6-2 for oil sampling by spectrometer analysis.

25. Ignition of fuel depends upon.
A. volatility.
B. atomisation.
C. both volatility and atomisation.
Ans : both volatility and atomisation.
Explanation: A volatile fuel will vapourise more easily. if it is a low volatility fuel (Jet-A1 etc) then the fuel is atomised through spray nozzles into the combustion chamber.

26. Kerosene is used instead of gasoline because.
A. kerosene is highly volatile and has good lubrication qualities.
B. Kerosene is less volatile and has good lubrication properties.
C. kerosene has a higher volatility than gasoline and has good lubrication abilities.
Ans : Kerosene is less volatile and has good lubrication properties.
Explanation: Kerosene is a more stable fuel for storage and handling.

27. If the specific gravity of a fuel is increased, the weight of a tank of fuel will.
A. decrease.
B. remain the same.
C. increase.
Ans : increase.
Explanation: SG = Weight of fuel relative to water.

28. Reid vapour pressure, is the vapour pressure exerted by a fuel when heated to.
A. 38°C.
B. 48°C.
C. 15°C.
Ans : 38°C.
Explanation: Rolls Royce The Jet Engine page 118 para 113.



Click Here For : DGCA & EASA Module 15  : Part-10 Engine Lubrication Systems Question

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