Induction And Cooling

Question 1

Decreased altitude will _____ air pressure.

Answer 1

Increase

Question 3

Temperature will affect the ______ of air.

Answer 3

Density

Question 4

Which of the following reduces engine performance?

High pressure
Low temperature
High humidity

Answer 4

High humidity

Question 5

What are two things to consider in aircraft induction systems?

Answer 5

Filter ice and dirt.

Deliver balanced fuel and air mixture.

Question 6

If a filter can be cleaned, in which direction should the cleaning solution flow?

Answer 6

opposite of the normal flow

Question 7

Where can approved cleaning instructions for filter maintenance be found?

Answer 7

Aircraft Maintenance Manual

Question 8

In flight, the forward motion of the aircraft produces an increase in intake pressure known as the

Answer 8

Ram

Question 9

Which is a possible subsystem of a naturally aspirated induction system?

Answer 9

alternate air source

Question 10

Which air filter system can be washed?

Answer 10

Flocked Screen

Question 11

Manifold air pressure is measured between the

Answer 11

Throttle plate and intake valve

Question 12

The fuel/air mixture is passed through the engine oil sump to

Answer 12

Warm the induction air

Question 13

When will small induction system air leaks have the most noticable effect?

Answer 13

At low RPM

Question 14

Carburetor icing is most severe at

Answer 14

at temperatures between 30 and 40 F

Question 15

Into what part of a reciprocating engine induction system is deicing alcohol normally injected?

Answer 15

The airstream ahead of the carburetor.

Question 16

Carburetor icing on an engine equipped with a constant-speed propeller can be detected by

Answer 16

constant RPM with a decrease in manifold pressure.

Question 17

What part of an aircraft in flight will begin to accumulate ice before any other?

Answer 17

Carburetor

Question 18

Where would a carburetor air heater be located in a fuel injection system?

Answer 18

Fuel injection systems use alternate air instead of carburetor heat.

Question 19

An increase in manifold pressure when carburetor heat is applied indicates

Answer 19

ice was forming in the carburetor

Question 20

During full power output of an unsupercharged engine equipped with a float-type carburetor, in which of the following areas will the highest presssure exist?

Answer 20

Carburetor air scoop

Question 21

The use of the carburetor air heater when it is not needed causes

Answer 21

a decrease in power and possibly detonation.

Question 22

As manifold pressure increases in a reciprocating engine, the

Answer 22

density of air in the cylinder increases.

Question 23

In an airplane equipped with an alternate air system, if the main air duct filter becomes blocked or clogged, the

Answer 23

system will automatically allow warm, unfiltered air to be drawn into the engine.

Question 24

The action of a carburetor air scoop is to supply air to the carburetor, but it may also

Answer 24

increase the pressure of the incoming air by ram effect.

Question 25

One source commonly used for carburetor air heat is

Answer 25

A muffler shroud or heat muff

Question 26

To what altitude will a turbo-charged engine maintain sea level pressure?

Answer 26

Critical Altitude

Question 27

Bootstrapping of a turbocharged engine is indicated by

Answer 27

a transient increase in engine power

Question 28

If the turbocharger waste gate is completely closed,

Answer 28

all the exhaust gases are directed through the turbine

Question 29

Boost manifold pressure is generally considered to be any manifold pressure above

Answer 29

30 inches of Mercury

Question 30

What is the purpose of the density controller in a turbocharger system?

Answer 30

Limits the maximum manifold pressure that can be produced by the turbocharger at full throttle.

Question 31

What is the purpose of a turbocharger system for a small reciprocating aircraft engine?

Answer 31

Compresses air to maintain manifold pressure constant from sea level to the critical altitude of the engine.

Question 32

The differential pressure controller in a turbocharger system

Answer 32

reduces bootstrapping during part-throttle operation.

Question 33

The purpose of a sonic venturi on a turbocharged engine is to

Answer 33

limit the amount of air that can flow from the turbocharger into t he cabin for pressurization.

Question 34

How is a supercharger driven?

Answer 34

Mechanically off of the crankshaft.

Question 35

The purpose of an intercooler when used with a turbocharger is to cool the

Answer 35

air entering the carburetor from the turbocharger.

Question 36

Superchargers which are powered by exhaust gasses are called

Answer 36

Turbochargers

Question 37

The valve that is used to control the amount of exhaust gases routed to the turbocharger is a

Answer 37

waste gate

Question 38

What is the air called in "A" between the compressor and the throttle plate?

Answer 38

Upper Deck Air

Question 39

What is the air in "B", between the throttle plate and the intake valve, called?

Answer 39

Manifold Air

Question 40

On an aircraft with a two-speed supercharger, which speed will the aircraft use for take-off?

Answer 40

Low

Question 41

Which turbocharger component provides motive power to the rotor?

Answer 41

Turbine

Question 42

Which turbocharger component compresses the air?

Answer 42

Impeller

Question 43

Oil in a turbine rotor bearing housing provides what important functions?

Answer 43

Lubricating and cooling

Question 44

What provides the force to operate the waste gate?

Answer 44

Spring and engine oil pressure

Question 45

What releases upper deck pressure if all other turbo controllers fail?

Answer 45

Pressure relief valve

Question 46

Which controller prevents upper deck pressure from rising too rapidly?

Answer 46

Rate-of-change

Question 47

Which controller operates ONLY at full throttle?

Answer 47

Density

Question 48

Turbo systems which boost only to 30"Hg are called:

Answer 48

Sea-level boosted

Question 49

The wastegate is moved open by:

Answer 49

Spring Pressure

Question 50

If the wastegate looses oil pressure, it will move to which position?

Answer 50

Open

Question 51

Anti-icing of jet engine air inlets is commonly accomplished by

Answer 51

engine bleed air ducted through the critical areas.

Question 52

On an aircraft turbine engine, operating at a constant power, the application of engine anti-icing will result in

Answer 52

noticeable shift in EPR

Question 53

The purpose of a bellmouth compressor inlet is to

Answer 53

maximize the aerodynamic efficiency of the inlet

Question 54

What method(s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) separators installed?

Answer 54

Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens.

Question 55

In a divergent duct air velocity _____ and air pressure increases.

Answer 55

decreases

Question 56

In flight, the forward motion of the aircraft produces an increase in intake pressure known as the

Answer 56

ram effect

Question 57

The inlet for a turbofan engine is similiar in design to that for a turboprop except that it discharges only a portion of its air into the engine, the remainder passes through the

Answer 57

fan

Question 58

The inlet duct on a subsonic turbojet powered aircraft is ______

Answer 58

Diverging

Question 59

When turbine engines are calibrated on a test stand, a _____ inlet is typically installed.

Answer 59

bellmouth

Question 60

What material is commonly used to reduce noise emissions in a turbine engine's intake duct?

Answer 60

Acoustic shielding

Question 61

Abrasion strips inside a turbine engine inlet duct:

Answer 61

Increase aerodynamic efficiency of the compressor blades.

Question 62

Screens are typically placed on APU inlets to

Answer 62

Prevent FOD ingestion

Question 63

When performing maintenance inside turbine inlets, which of the following is not recommended:

Answer 63

Place as many loose objects in your pockets as you can.

Question 64

Which of the following discharges fan bypass air directly behind the fan?

Answer 64

Unducted fan

Question 65

What advantage(s) do modern titanium blades used in turbine engine fans have over older steel blades?

Answer 65

Lighter weight and increased resistance to FOD.

Question 66

Increase altitude will ___ the air pressure?

Answer 66

Decrease