True-False
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1. |
The most common ignition system in Army gas turbine engines produces high tension voltage by conventional induction coils.
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2. |
Fuel is invariable conducted between the parts of the system through flexible lines.
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3. |
Oil is cooled in some gas turbine engines by transferring the heat in the oil to the fuel flowing to the fuel nozzles.
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4. |
Because the burning process is continuous in a gas turbine engine, the amount of cooling air is greater than the amount of combustion air.
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5. |
The pressurizing and drain dump valves may be used to prime the fuel control.
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6. |
The fuel pump may be built into the fuel control, or it may be a separate component.
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Cluster True-False
Each of the following groups of questions is related to the statement that precedes them.
FIRST GROUP
Gas turbine engines may have several fuel filters. Which of the following statements about them are true and which false?
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7. |
Usually a filter includes a relief valve to open at a specified differential pressure.
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8. |
A filter made of stainless steel mesh cloth used to filter particles larger than 40 microns is called a cylindrical screen filter.
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9. |
Filters may be located in other places in the fuel system besides the main lines.
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10. |
A paper cartridge filter removes particles larger than 100 microns.
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11. |
A cylindrical screen filter is used where the fuel pressure is high.
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SECOND GROUP
The text tells you that ignition systems are of three general types. Which of these questions on them are true and which false?
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12. |
All gas turbine engines have two or more igniter plugs.
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13. |
The high-energy capacitor type of ignition system actually produces a small amount of energy.
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14. |
The annular-gap igniter plug electrode can operate at a cooler temperature than that of the constrained-gap plug.
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15. |
In gas turbine engines, ignition takes place in microseconds.
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16. |
Electrodes of gas turbine igniters and of conventional spark plugs can accommodate the same amount of energy.
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17. |
Severely damaged ignition exciter units should be handled with forceps or gloves because they may be radioactive.
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THIRD GROUP
About lubrication systems for gas turbine engines, your text tells you that:
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18. |
Oil for gas turbine engines has a conventional petroleum base.
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19. |
In most turbine engines, the oil is stored separately from the engine.
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20. |
Pressure developed by a gear pump has no relation to engine rpm.
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21. |
Oil drawn from the engine by scavenge pumps is discarded.
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22. |
A gerotor pump has a tooth missing in its inner toothed element.
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23. |
The oil tank is usually made of welded aluminum or steel.
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24. |
The sole purpose of the lubrication system is to reduce friction.
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FOURTH GROUP
Which of the following six statements about the automatic and manual fuel control systems are true and which false? |
25. |
The amount of fuel needed to run the engine varies with inlet air temperature and pressure.
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26. |
Automatic fuel control is provided by the speed governor.
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27. |
The manual throttle control compensates for altitude and temperature.
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28. |
Most fuel controls in use today are hydromechanical.
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29. |
The speed governor is merely a spring attached to the manual metering valve.
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FIFTH GROUP
About the starting-fuel system, your text tells you that: |
30. |
All gas turbine engines have the same number of start-fuel nozzles.
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31. |
The pilot turns on the start-fuel solenoid switch in the cockpit.
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