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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.
engine cooling systems oral

5. what should be done to cylinders when too much of the cooling fin area is broken off?
the cylinder should be replaced because it cannot cool properly and a hotspot will develop.
engine cooling systems oral.

6. when should cowl flaps be kept in the fully open position?
normally during all ground operations.
engine cooling systems oral.

7. what publication should be referred to before reprofiling cylinder cooling fins?
the manufacturers service or overhaul manual should be used to obtain the allowable limits.
engine cooling systems oral.

8. what power sources are used to operate the cowl flaps?
cowl flaps may be operated by electrical power, hydraulic power, or manually.
engine cooling systems oral.

9. what is the purpose of blast tubes that are built into the bagfles on a reciprocating engine.
To direct jets of cooling air on to the rear spark plug elbows of each cylinder to prevent overheating of the ignition leads.
engine cooling systems oral

10. what are the main reasons that excessive heat in a reciprocating engine is undesirable?
excessive heat shortens the life of the engine parts, impares lubrication and effects combustion.
engine cooling systems oral.

11. what is an augmenter system?
augmentors consist of two pairs of tubes running from the engine compartment to the rear of the nacelle. the exhaust gas collector feeds exhaust gases into the inner augmenter tubes. where that have passed over the engine is fed into the outer tubes where it is heated, by the exhaust tubes and then expelled to mix with the exhaust gases. the heating of the air causes it to form a high temperature, low pressure, jet like exhaust which draws additional cooling air over the engine. the heated air is sometimes used for cabin heating, defrosting, and anti-icing.
engine cooling systems oral

12. what is the source of air that is directed to turbine engine bearings for cooling?
it is bleed air from the compressor section of the engine.
engine cooling systems oral

13. what areas of a turbine engine are cooled by the secondary air passing through the engine?
the combustion chambers and the turbines.
engine exhaust systems oral

1. what are two types of reciprocating engine exhaust systems?
the short stack system and the collector system.
engine exhaust systems oral

2. what are the possible hazards of exhaust system failure?
depending on the location and type of exhaust system failure, it can result in carbon monoxide poisoning of the crew and passengers, partial or complete loss of engine power, and an aircraft fire.
engine exhaust systems oral

3. what type of exhaust system is generally used on low-powered non supercharged engines?
the short (open) stack system.
engine exhaust systems oral

4. what type of exhaust system is used on turbocharged engines?
the exhaust collector system.
engine exhaust systems oral

5. which type of exhaust system creates a higher exhaust back pressure?
the collector system.
engine exhaust systems oral

6. what is the purpose of a reciprocating engine exhaust system?
to dispose of the high temperature, noxious gases that are discharged by the engine
engine exhaust systems oral

7. what happens when lead, zink, or galvanized marks are made on an exhaust system?
the mark is absorbed by the metal when it is heated and causes a change in the molecular structure of the metal.
engine exhaust systems oral.

8. what type of visual indication can usually be seen in the area of an exhaust leak?
exhaust leaks usually leave flat grey or sooty black streaks on the pipes in the area of the leak.
engine exhaust systems oral.

9. what is the usual cause of muffler and heat exchanger failures?
they are usually caused by thermal and vibration cracking or ruptures in areas of stress concentration.
engine exhaust systems oral

10. where are exhaust manifold and stack failures most likely to occur?
these failures usually occur at welded or clamped points in the system.
engine exhaust systems oral.

11. what is a common cause of the waste gate unit malfunctioning in a turbocharger system?
the most common cause of waste gate malfunctioning is carbon buildup, causing the waste gate valve to stick in the \"closed\" position.
engine exhaust systems oral

12. what factors are affected if the area of the exhaust nozzle of a turbine engine is changed?
the size of the exhaust nozzle affects both the engine performance and the exhaust gas temperature.
engine exhaust systems oral.

13. what are the probes in a turbine exhaust tailpipe used for?
they are used to measure exhaust gas temperature EGT, or pressure for an EPR system
propellers oral

1. what is the purpose of a propeller?
to create thrust and either pull or push the airplane through the air.
propellers oral

2. what type of propeller has the blade angle built into the propeller and cannot be changed?
a fixed pitch propeller.
propellers oral

3. what is the purpose of the metal tipping on the leading edge of a wooden propeller?
it is to protect the propeller from damage caused by fine particles in the air during landing, taxiing, and take off.
propellers oral

4. what is the process of determining the positions of the tips of the propeller blades relative to each other?
Tracking
propellers oral

5. what tool is used to determine propeller blade angle?
A universal propeller protractor.
propellers oral

6. what are the aerodynamic forces and loads acting on a rotating propeller blade?
a rotating propeller is acted upon by centrifugal, twisting, and bending forces.
propellers oral

7. what is the meaning of the propeller blade \"back\" and \"face\"?
the cambered or curved side of the propeller blade is called the blade back. This is the side of the blade that faces away from the engine. The flat of the propeller blade is known as the blade face. This side of the blade faces the engine.
propellers oral

8. what should be used to clean aluminum and steel propeller blades and hubs?
they should be washed with a suitable cleaning solvent using a brush or cloth.
propellers oral

9. what positions are used on a balance stand to check a two bladed propeller for static balance?
first the vertical position and then a horizontal position
propellers oral

10. when centrifugal force acts on the counterweights of a hydraulic counterweight propeller, it tends to rotate the blades in which direction?
centrifugal force tends to increase the blade pitch.
propellers oral

11. why do you put the blades of a counterweight propeller into high pitch before stopping the engine?
this type of propeller has a movable cylinder that slides over the propeller piston. in the low pitch position, the cylinder is outboard and the piston is exposed to the open air. but in the high pitch position, the cylinder moves inboard and covers the propeller piston. in this position the piston is protected from dirt and moisture in the air. this is particularly important if the airplane engine will not be operated for several days.
propellers oral

12. how is feathering accomplished on a constant speed counterweight propeller?
releasing governor oil pressure allows the counterweights and feathering springs to move the blades to the feathered position.
propellers oral

13. what type of ice control systems are used for propellers?
either fluid, or electrical deicing systems, are used for deicing propellers.
propellers oral

14. what is the purpose of the slinger ring on some propeller installations?
propeller deicing fluid is ejected from a stationary nozzle on the engine into a scoop attached to the rear of the propeller assembly. this U shaped channel is called the slinger ring. the fluid under pressure of centrifugal force is transferred through a nozzle to the propeller blades.
auxiliary power units oral

1. frequently, an aircraft auxiliary power unit generator is the same as?
the engine driven generators.
auxiliary power units oral

2. fuel is normally supplied to an APU from?
the airplanes main fuel supply.
auxiliary power units oral

3. and APU is usually rotated during start by?
an electric starter.
auxiliary power units oral

4. the function of an APU air inlet plenum is to?
stabilize the pressure of the air before it enters the compressor.
auxiliary power units oral

5. when in operation, the speed of an APU?
remains at or near rated speed regardless of the load condition.
auxiliary power units oral

6. generally when maximum APU shaft output power is being used in conjunction with pneumatic power?
pneumatic loading will be automatically modulated to maintain a safe EGT.
auxiliary power units oral

7. when necessary, APU engine cooling before shutdown may be accomplished by?
closing the bleed air valve.
auxiliary power units oral

8. usually, most of the load placed on an APU occurs when?
the bleed air valve is opened.
auxiliary power units oral.

9. fuel scheduling during APU start under varying pneumatic and electrical loads is maintained?
automatically by the APU fuel control system.
auxiliary power units oral.

10. on APU\'s equipped with a free turbine and load compressor, the primary function of the load compressor is to?
provide bleed air for aircraft pneumatic systems.
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