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Ap > Reciprocating Engine Induction And Cooling System > Flashcards

Reciprocating Engine Induction And Cooling System Flashcards

1
Q

The basic induction system of an aircraft reciprocating engine consist of what component

A

Air scoop used to collect the inlet air and ducting that transfer the air to the inlet filter

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2
Q

What are the three major parts of a reciprocating engine induction system?

A

Air scoop, fuel delivery system, and intake manifold

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3
Q

What effect does the induction system icing have on engine performance?

A

Engine acting erratically, lose power, and possibly quit

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4
Q

What method is used to prevent or remove induction system ice in a reciprocating engine

A

Heated air

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5
Q

How is ice cleared in some aircraft induction system if the carbureto heat is too low to clear the ice

A

Alcohol is sprayed into the induction system ahead of the carburetor, the fluid will dislodged ice, which is ingested by the engine

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6
Q

What engine indication can be the result of a dirty air filter?

A

low power

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7
Q

What is the danger of using carburetor heat when operating a higher power setting?

A

Detonation and possible engine failure

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8
Q

Carburetor throttle ice is most likely to form with the throttle is in which position

A

Partially close position

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9
Q

What are the two general classification of superchargers used in a reciprocating engine induction system?

A

Internally driven or externally, driven supercharger system

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10
Q

What is the purpose of distribution impeller in a radial engine?

A

To break up the fuel globules into a finer particles for better distribution to the cylinder

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11
Q

How does a internal driven supercharger get its power?

A

Mechanically engine driven. High speed impeller is driven through a gear train from the crankshaft.

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12
Q

Where does externally driven supercharger get its power

A

By the exhaust gases that are directed against the turbine, also known as turbochargers

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13
Q

What unit regulates the amount of exhaust gases to the turbine of a turbocharger?

A

A waste gate

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14
Q

What type of powered is used to control the position of the Turbocharger waste gate on some engines?

A

Oil pressure to an actuating piston

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15
Q

What can cause waste gate to stick

A

Build up of carbon deposits

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16
Q

What are the most common ways to control a waste gate?

A

Mechanical linkage to throttle or separate control, or by an actuator that is driven by the oil pressure.

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17
Q

What causes fuel evaporation ice?

A

Decrease in air temperature resulting evaporation of fuel after it is introduced into the airstream

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18
Q

What is the function of a Turbocharger waste gate?

A

Controls the volume of exhaust gas that is directed onto the turbine

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19
Q

What may be the indication of leaking intake pipe?

A

Engine running rough

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20
Q

What may be the indication of a turbo charger Waste gate will not close fully

A

Aircraft may not be able to reach critical altitude

21
Q

What could be the probable cause of a turbocharger engine that surges

A

Waste gate or controller malfunction

22
Q

What is used on many Turbocharger Engines for waste gate actuator power

A

Oil pressure

23
Q

How does divergent shape jet engine inlet affect, air flowing to the engine when the airplane is in subsonic flight?

A

Cause the air velocity to decrease and air pressure increase

24
Q

Bellmouth inlet ducts are used typically on what type of aircraft

A

Helicopter

25
Q

venturi type particle separator, found on many turbine powered helicopters, utilizes what characteristics of matter to help remove debris from induction air

A

Inertia

26
Q

What is the most common means of regulating the cooling air flow through a reciprocating engine?

A

Using cowl flaps

27
Q

what is the purpose of the fins on the engine cylinders?

A

To increase the surface area of the cylinder for cooling

28
Q

What other engine characteristics are designed to aid in engine cooling besides cooling fin

A

Baffles and engine cowling

29
Q

How is an engine designed to provide more cooling area?

A

The outer surface of the cylinder is increased by using cooling fins

30
Q

Why is the open and close adjustment during installation of cowl flaps important

A

Cowl flaps are set for a tolerance that will permit them to open and close in the correct amount to keep the cylinder head temperature within allowable limit

31
Q

What should be done to the cylinder when much of the cooling fins are broken off

A

Should be replaced because it cannot cool properly and hotspot would develop

32
Q

When should clow flap be kept in fully open position

A

During ground operation

33
Q

What power source are used to operate the cowl flaps

A

Electrical power, hydraulic power, or manually

34
Q

What is the purpose of a blast tubes

A

To direct jetS of cooling air to accessories of engine that have high heat concentrations. On radial engine they duct air onto the spark, plug elbows of each cylinder to prevent overheating of ignition leads

35
Q

what are the main reasons that excessive heat in a reciprocating engine is undesirable

A

 Shorten the life of engine parts, impairs lubrication, and affect combustion

36
Q

Describe the augmentor system

A

It is used to keep the temperature of air cooled engines down by using exhaust gas energy to draw cool air over the engine

37
Q

What is the source of air directed to the engine bearings for cooling?

A

Bleed air from the compressor section

38
Q

What is the purpose of insulation on the exhaust duct of a turbine engine?

A

To reduce the temperature of the structure in the vicinity of the exhaust duct or afterburner and to fuel oil coming in contact with the hot part of the engine

39
Q

What type of materials are used to make insulation blanket for a turbine engine?

A

Stainless steel, layers of aluminum foil, fiberglass, and silver foil

40
Q

What areas of a turbine engine are cool by the secondary air passing through the engine

A

 Combustion chamber and the turbines

41
Q

What is the purpose of a engine cowling?

A

it streamlines the engine to reduce drag and forms an envelope around the engine, which force is the airstream between the cylinders to cool them

42
Q

What is the purpose of a oil cooler bypass valve?

A

 Allows the thick oil to bypass the cooler when the oil is cold

43
Q

Where should a cowl flap be position during ground operation?

A

Fully opened

44
Q

What is the purpose of cowl flap air seal

A

They forced air to circulate around and through the baffle system

45
Q

Where must most cooling air flow to cool a turbine engine

A

 Through inside of the engine

46
Q

What areas of turbine engines are cool by air passing through the engine

A

The combustion chamber and turbine

47
Q

What is the relationship between turbine engine upper temperature limit and the power produced

A

The Higher combustion temperature that an engine could withstand without damage ,the more power is capable of producing

48
Q

What is the approximate percentage open air passing through a turbine engine that is used for cooling rather than combustion

A

75%

Ap (13 decks)

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