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Fuel Metering > Fuel Injection > Flashcards

Fuel Injection Flashcards

1
Q

What are some advantages of fuel injection

A

Better control of fuel economy and fuel evaporation
Evenly distributes fuel
Eliminating carburetor ice

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2
Q

What are the two types of fuel injection

A

Direct injection

Continuous-flow

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3
Q

What are the two types of continuous flow fuel injection systems

A

Precision air motive

Teledyne-continental

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4
Q

What’s the components of the rsa injection systems

A

Venturi housing
Fuel metering unit
Fuel regulator
Flow divider and fuel nozzels

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5
Q

How does the idle valve operate based off the throttle valve

A

It is linked to the throttle valve allowing the idle valve to open at the same time as the throttle valve

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6
Q

What is used in the fuel metering unit in the Mixture control valve to control flow

A

Valve plate

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7
Q

How does a fuel regulator regulate fuel

A

Uses the air by the air metering unit and the fuel metering force developed by the ball valve allowing the scheduling flow of fuel

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8
Q

What components are key when opening the fuel regulator system and can become cracked of flawed

A

Diaphragms

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9
Q

The fuel required for idling is supplied by what

A

The constant head idle spring or C.H.I.S

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10
Q

What is used to smoothly transfer from idle speeds to cruise speeds

A

Constant effort spring

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11
Q

What is the key component in the automatic mixture control

A

Bellows

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12
Q

How does a automatic mixture control work

A

It controls based of the pressure difference across the air diaphragms

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13
Q

Where is a flow divider is located

A

Usually located on the top of the engine

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14
Q

What type of tubing is used on flow dividers tubing

A

Stainless stell

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15
Q

What type of measurement does the instrument go by

A

It reads in gallons per hour

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16
Q

Where are the fuel nozzles located on an aircraft

A

They are threaded into each cylinder

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17
Q

Fuel nozzles can also be classified as

A

Air bleed type nozzles

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18
Q

How can u identify fuel nozzles

A

A stamped letter on the nozzle body

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19
Q

How is the idle speed get adjusted

A

By an idle speed screw

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20
Q

Teledyne continental injection system use what type of metering force

A

Fuel metering

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21
Q

What are the basic components to the teledyne continental injection system

A

Engine driven pump
Fuel/air control unit
Fuel manifold valve
Injector nozzles

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22
Q

How does the air get out of the fuel in the injector pump

A

By swirling the air

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23
Q

What is the components in the fuel- air control unit

A

Mixture control
Main metering jet
Throttle valve

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24
Q

What does the direct link between the fuel and throttle mixture allow for

A

Proportional increase/ decrease of fuel to the manifold valve

25
Q

What is the component that helps with the dispersement of fuel to the cylinders

A

The manifold valve

26
Q

Why is the vent never pointed tword the front of the engine

A

If it was the air pressure would be to great and no fuel would be allowed into the cylinders

27
Q

What components make up the manifold valve

A 
Diaphragm 
Screen
Calibrated spring 
Fuel inlet 
Outlet to nozzles 
Cut off valve 
Poppet valve
28
Q

What are mechanics limited to when working on rsa or teledyne continental injection systems

A

Cleaning nozzles
Field adjustments
Low fuel pressure
High fuel pressure

29
Q

How do you clean injector nozzles

A

By soaking them in a suitable solvent and inspecting for clogged orifices

30
Q

What are the things that need to be inspected for fuel systems

A 
Exterior fuel leaks 
Fuel pressure checks and adjustments 
Identical fuel flow across nozzles
Engine control travels
Idle speed and mixture
31
Q

What are the two air metering forces on a pressure carburetor

A

Venturi pressure

Impact air

32
Q

Where is fuel held constant pressure on a pressure carburetor

A

The discharge valve

33
Q

Jet A-1 is a what type fuel

A

High grade kerosene

34
Q

Jet B is what type of fuel

A

Kerosene/Gasoline Mixture

35
Q

What is the anti-microbial and anti freeze

A

Prist

36
Q

How does the FCU schedules fuel

A

Based off adding/ removing heat energy

37
Q

What is the perfect air-fuel mixture

A

15:1

38
Q

Fuel is mixed with approximately what percent of the total primary air

A

25%

39
Q

What does the FCU control

A

Acceleration and Deceleration rates

40
Q

What does the FCU monitor

A 
Power Lever position 
Inlet air temperature and/ or pressure 
Compressor speed 
Burner air pressure 
Turbine inlet temp
41
Q

What are the different type of fuel control units

A

Hydro mechanical

Hydro pneumatic

42
Q

What are the types of electronic engine controls

A

Supervisory Electronic Engine Control

Full authority digital engine control

43
Q

Describe how hydro mechanical connection helps piolets

A

The operator had a direct connection to the FCU

44
Q

How is the power lever control the fuel flow on a turbine engine

A

The power lever is connected to the speeder spring

45
Q

How does the engine flyweights operate on the FCU

A

It senses the engine speed and then helps by regulating fuel and the weights will either go in or out based on speed

46
Q

What is the three types of speeds the fly weights can be at

A

Under speed
On speed
Over speed

47
Q

What are used to control acceleration and deceleration in a hydro mechanical FCU

A

Differential relief valve

Burner pressure sensor

48
Q

What are the differences of a hydro pneumatic system

A

Utilizes the air pressure sensing system.

49
Q

How does it work with the propeller

A

They are interconnected to the engine and FCU control unit

50
Q

What are the two types of electronic engine control systems

A

Supervisory EEC

Full authority digital engine control

51
Q

What system is on the hydro mechanical system

A

Supervisory EEC

52
Q

How does the supervisory EEC

A

They sense based off engine operating parameters and schedules. It compensates for variation in flight conditions to reduce pilot workload. Prevents engine exceedances.

53
Q

What does the basic fuel injection fuel system include

A 
Fuel storage tanks 
Shut off and selector valves 
Boost/auxiliary pumps and engine driven pumps 
Filters/ screens and low point drains 
Fuel heat exchangers
54
Q

What are the two types of fuel nozzles In fuel injection

A

Vaporizing

Atomizing

55
Q

How does the fire light in all canisters

A

It lights by a flame propaganda tubing

56
Q

How does atomizing fuel nozzles work

A

Utilize high pressure fuel and specifically sized discharge orifices to produce the spray patter

57
Q

What are the two types of atomizing fuel nozzles

A

Simplex

Duplex

58
Q

How does duplex fuel injectors work

A

By having a primary and secondary fuel inlet and the primary is for starting and secondary is for above Cruising idle speed

59
Q

What does the pressurization and dump valve work

A

Supply fuel to manifold and nozzles at the correct pressure for starting and running spray patterns
Dump the fuel from the nozzles and manifold to aid in rapid engine shut down and to prevent fuel from evaporating in a hot combustion chamber

Fuel Metering (2 decks)

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