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Ignition Systems Oral.

9. What three conditions are required to fire the plugs in a cylinder when the piston is in the prescribed position?
The magneto rotor must be in the E-gap position the breaker points must open, and the distributors must be aligned with that cylinder.
Ignition Systems Oral.

10. In a dual magneto ignition system, what part of the system is grounded when the ignition switch is placed in the right position?
The left magneto circuit will be grounded.
Ignition Systems Oral.

11. What is internal timing of the magneto?
It is adjusting the breaker points to open when the rotating magnet is in the E-gap position.
Ignition Systems Oral.

12. What is the purpose of an impulse coupling used with a magneto?
The purpose of an impulse coupling is to spin teh magneto rapidly to produce a hot spark for starting the engine and at teh same time retard the timing of the spark.
Ignition Systems Oral.

13. What is the proper spark plug reach?
When the electrode end of the plug inside the cylinder is in the best position to acheive ignition.
Ignition Systems Oral.

14. What type of ignition system is used in most turbine engines?
A typical turbine engine is equipped with an electronic capacitor type ignition system.
Ignition Systems Oral.

15. What is the function of the igniter plugs in a turbine engine?
to provide a discharge gap for the current which is stored in the capacitor. The discharge results in a high intensity spark which ignites the fuel-air mixture.
Ignition Systems Oral.

16. When are turbine engine ignition systems normally in use?
The igntion system is normally required only for starting or restarting the engine.
Ignition Systems Oral.

17. Define the term duty cycle.
it is when the starter can only run so long until a rest period is required.
Fuel Metering Systems Oral.

1. Where are the fuel spray nozzles located in a turbine engine?
They are located either externally or internally on the combustion chamber in such a way that the fuel can be sprayed into the combustion area.
Fuel Metering Systems Oral.

2. Name two heat sources for the operation of the fuel heaters used in turbine engines?
turbine engine fuel heaters operate as heat exchangers. Fuel lines are routed through the fuel heater, which uses as a heat source either bleed air or engine lubricating oil.  If bleed air is used as a heat source it is called an air-to-liquid heat exchanger, and when oil is used it is called a liquid-to-liquid heat exchanger
Fuel Metering Systems Oral.

3. what engine variables are sensed by a hydromechanical fuel control?
The fuel control senses power lever position, engine rpm, either compressor inlet pressure or temperature, burner pressure or compressor discharge pressure, and either EGT or TTT.
 
Fuel Metering Systems Oral.

4. what are the two most commonly used carburetors in small reciprocating engines.
they are the float-type carburetor, and the pressure type carburetor.
Fuel Metering Systems Oral.

5. What type fuel control unit is used in a turbine engine?
Both hydromechanical and electronic fuel control units are in use today. however, the most commonly used fuel control unit is the completely hydromechanical type.

Fuel Metering Systems Oral.

6. What is the purpose of a mixture control in a float type carberator?
It is to control the the fuel-air mixture as air density changes with changes in attitude.
Fuel Metering Systems Oral.

7. Describe the purpose and operation of a venturi.
The Venturi performs three functions, it proportions the fuel air mixture, lowers the pressure at the discharge nozzle, and limits the airflow at full throttle.
Fuel Metering Systems Oral.

8. What will be the result of using excessivley rich idle mixtures?
This will cause spark plug fouling.
Fuel Metering Systems Oral.

9. what is the purpose of the economizer system in a float-type carburator.
The econimizer is essentially a valve which is closed at throttle levels below 60 and 70 percent of rated power, but provides additional fuel for cooling the engine to prevent detonation at higher throttle settings.
Fuel Metering Systems Oral.
10. where does a pressure injection caburetor obtain fuel pressure?
It obtains fuel pressure from the boost pump for starting and from the engine driven fuel pump for normal operation of the engine.
Fuel Metering Systems Oral.

11. What operates an automatic mixture control (amc) on a pressure carburetor?
The AMC contains a dealed bellow that expands and contracts with changes in atmospheric pressure.  The movement of the bellow operates a tapered needle that controls the impact air pressure inthe the A chamber of the carburetor.
Fuel Metering Systems Oral.

12. What RPM indication should result when the mixture control is placed in the idle cutoff position when the idle mixtrue is set correctly.
There should be a slight increase in RPM, followed by a rapid drop of RPM to zero.
Fuel Metering Systems Oral.

13. What is the purpose of filling a pressure injection carburetor full of fuel and allowing it to soak for a period of about 8 hours prior to installation.
This is done in order to soften the diaphragms and make them as pliable as they were when the carburetor was originally calibrated.
Engine Fuel Systems Oral.

1. What is the purpose of strainers in a fuel system?
They are used to prevent foreign matter from entering the carburetor.
Engine Fuel Systems Oral.

2. What is the purpose of fuel selector valves.
They provide a means of shutting off fuel flow, for tank and engine selection, for crossfeed, and forfuel transfer.
Engine Fuel Systems Oral.

3. what should be looked for when inspecting an engine driven pump.
look for fuel leaks and security of mounting.
Engine Fuel Systems Oral.

4. what is the purpose of an engine driven fuel pump?
The engine driven fuel pump must deliver a continuous supply of fuel at the proper pressure at all times during engine operation.
Engine Fuel Systems Oral.

5. What happens to the excess fuel not required by the engine in a constant displacement pump.
The presure relief relief valve opens and the fuel is routed back to the inlet side of the pump.
Engine Fuel Systems Oral.

6. what is the most common type of fuel boost pump?
The Electrcially driven centrifigul type pump.

(eliminates air) (located in tank)
Engine Fuel Systems Oral.

7. What is the purpose of the bypass valve in the engine driven fuel pump?
The Bypass valve provides a path around the pump vanes for starting the engine, and to allow fuel to bypass the pump in case of pump failure.
Engine Fuel Systems Oral.

8. What is the purpose of using boost pumps in a fuel system?
Electric boost pumps are used to supply fuel to a pressure carburetor during engine starting and in case of engine driven pump failure. However, a man function of a boost pump is to keep the pressure on teh suction side of the engine driven pump from becoming low enough to permit the fuel to boil when operating at high altitudes.
Engine Fuel Systems Oral.

9. What are the three general causes of vapor lock?
They are low fuel pressure, high fuel temperatures, and excessive fuel turbulence.
Engine Fuel Systems Oral.

10. Turbine engine fuel pumps may be divided into what two destinct system categories?
constant displacement and variable displacement.
Engine Fuel Systems Oral.

11. What category is a turbine engine driven gear-type pump.
Constant displacement.
engine fuel systems oral.

12. what type of fuel pump can be made to vary the fuel flow at any speed?
the variable displacement pump.
engine fuel systems oral

13. what part of a gas turbine engine fuel system is very susceptible to the formation of ice?
the fuel filter
engine fuel systems oral

14. how is the engine fuel system protected from ice formations?
by the use of fuel heaters
engine fuel systems oral

15. why is a micron fuel filter provided with a bypass valve as a necessary safety factor?
because the small openings in this type of filter make it very susceptible to clogging.
engine indication systems oral.

1. what are the three major parts of a reciprocating engine induction system?
the air scoop and the ducting, the carburetor, and the intake manifold.
engine indication systems oral

2. What effect does induction system icing have on engine performance?
induction system icing can cause an engine to act erratically and lose power.
engine indication systems oral

3. what method is used to prevent or remove induction system ice in a reciprocating engine?
the most common method of preventing or removing ice formation in the induction system is by the use of heated air.
engine indication systems oral.

4. how is ice cleared and some aircraft induction systems if the carburetor heat is too low to clear the ice?
a fluid such as alcohol, anilol, or mersol, is sprayed into the induction system ahead of the carburetor. The fluid will dislodge the ice which is ingested by the engine.
engine indication systems oral

5. what engine indication can be the result of a dirty air filter?
low power.
engine indication systems oral

6. what are the two general classifications of superchargers used and reciprocating engine induction systems?
they are classified as gear driven (supercharger) or exhaust driven (turbocharger) systems.
engine indication systems oral.

7. where does an externally driven supercharger get its power?
the exhaust gases are directed against a turbine, for this reason they are commonly called turbochargers.
engine indication systems oral.

8. what unit regulates the amount of exhaust gases to the turbine of a turbocharger?
the waste gate.
engine indication systems oral

9. what type of power is used to control the position of the turbocharger waste gate on some engines?
oil pressure to an actuating piston.
engine cooling systems oral.

1. What is the most common means of regulating the cooling air flow through a radial engine?
by the use of cowl flaps.
engine cooling systems oral

2. what is the purpose of the fins on engine cylinders?
to increase the effective size of the cylinder for cooling.
engine cooling systems oral

3. what other engine characteristics are designed to aid in engine cooling besides cooling fins?
the engine cowling and baffles are designed to force air over the cylinder cooling fins.
engine cooling systems oral

4. why is the \"open and close\" adjustment during installation of cowl flaps important?
for each engine installation, the cowl flaps are set for tolerances that will permit them to open and close the correct amount to keep the cylinder head temperature within allowable limits.
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