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Powerplant Textbook Questions > Fuel Metering: Pressure Carbs, and Fuel Injection > Flashcards

Fuel Metering: Pressure Carbs, and Fuel Injection Flashcards

1
Q

A pressure-injection carburetor discharges fuel into the center, or eye, of the internal ______________.

A

Supercharger Impeller

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2
Q

Two components of the air metering force are ________ pressure and _________ pressure.

A

Venturi

Impact Air

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3
Q

Metered fuel is held at a constant pressure by the spring-loaded _________ valve.

A

Discharge Nozzle

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4
Q

The device that automatically adjusts the fuel-air mixture ratio to keep it constant as the altitude changes is the __________.

A

Automatic Mixture Control

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5
Q

Fuel vapors that collect in a pressure carburetor are returned with a small flow of fuel to one of the aircraft ________.

A

Fuel Tanks

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6
Q

Idling fuel pressure is produced by a _________ in chamber A which holds the poppet valve open when there is only a small amount of air flowing through the carburetor.

A

Spring

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7
Q

The acceleration pump diaphragm is held against spring pressure by _________ manifold pressure.

A

Low

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8
Q

The manual mixture control in a pressure carburetor is an adjustable __________ between chambers A and B.

A

Needle Valve

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9
Q

The automatic mixture control _______ the fuel-air mixture as the aircraft goes up in altitude.

A

Leans

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10
Q

The power-enrichment system adds additional fuel when the engine is operating at __________ power.

A

High

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11
Q

The amount the idle fuel valve remains off its seat can be adjusted to change the idle __________.

A

Mixture

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12
Q

When the throttle is suddenly opened, the fuel from the acceleration pump is forced out into the air stream by __________.

A

A Spring

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13
Q

The automatic mixture control is ________ with the manual mixture control.

A

Parallel

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14
Q

The power enrichment valve on a PS carburetor is ________ to the main metering jet.

A

Parallel

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15
Q

Overhaul of a pressure carburetor is a _______ repair.

A

Major

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16
Q

Before returning an engine to service after the installation of a freshly overhauled pressure carburetor and the carburetor allowed to sit with fuel in it for at least ____ hours.

A

8

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17
Q

An engine equipped with a pressure carburetor is started with the mixture control in the __________ position

A

Idle Cutoff

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18
Q

When adjusting the idle mixture control, pull mixture control toward IDLE CUTOFF and watch the tachometer. Before the engine dies the RPM should momentarily__________.

A

Increase

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19
Q 
The four subsystems for an RSA fuel injection system are:
\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_
A

Servo Regulator
Fuel Control
Flow Divider
Nozzles

20
Q

The mixture control oraface and main metering jet of an RSA fuel injection system are in ________.

A

Series

21
Q

The air metering force in an RSA fuel injection system tends to ________ the servo valve.

A

Open

22
Q

Unmetered fuel pressure acting on one side of the fuel diaphragm tends to ________ the servo valve.

A

Close

23
Q

When airflow in the engine increases, the pressure drop across the main metering jet _________.

A

Increases

24
Q

The servo valve in the RSA fuel injection system __________ meter fuel.

A

Does Not

25
Q

The RSA fuel injection system __________ have a seperate idle metering jet

A

Does Not

26
Q

The servo ball valve is held off its seat during idle conditions by the constant-_______ spring

A

Head

27
Q

The movement of the air diaphragm is assisted when transporting fuel from idle to cruise power by the constant-_________ spring.

A

Effort

28
Q

The automatic mixture control ________ the pressure difference across the air diaphragm when the aircraft goes up in altitude.

A

Decreases

29
Q

The power-enrichment jet is in ________ with the main metering jet.

A

Parallel

30
Q

Three functions of the flow divider are:
__________
__________
__________

A

Aids in constant idling
Distributes fuel evenly to all cylinders
Provides a positive shut off when the engine s shut down

31
Q

An engine equipped with an RSA fuel injection system is started with the mixture control in the ________ position

A

Idle Cutoff

32
Q

Fuel for starting the engine is sprayed into the intake valve chamber by momentarily moving the mixture control to the __________ position with the boost pump turned on.

A

Full Rich

33
Q

Increasing the length of the rod connecting the throttle air valve with the throttle fuel valve causes idle mixture to become ________.

A

Richer

34
Q

A plugged injector nozzle will indicate on the flowmeter as a/an ________ flow.

A

Increased

35
Q 
The four basic components of the TCM fuel injection system are:
\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_
\_\_\_\_\_\_\_\_
A

Engine driven injector pump
Fuel air control unit
Fuel manifold valve
Nozzles

36
Q

The devices in a TCM fuel injection system that varies pressure of fuel going to the metering jet is the ________.

A

Injector Pump

37
Q

Vapors are separated from fuel in a TCM fuel injection system in the __________.

A

Injector Pump

38
Q

Fuel from the auxiliary pump for starting the engine flows around the injector pump vanes through the __________.

A

Bypass Valve

39
Q

The low unmetered fuel pressure is set by adjusting the________ in the injector pump

A

Relief Valve

40
Q

The high unmetered fuel pressure is set by adjusting the ________ in an injector pump

A

Orifice

41
Q

The TCM fuel-air control unit __________ use a venturi to sense the amount of air flowing into the engine.

A

Does not

42
Q

The adjustable stop that controls the amount the throttle air valve remains open when the throttle is all the way back determines the idle ______.

A

RPM

43
Q

The bellows in the injection pump on a turbo charged engine controls the ________.

A

Orifice

44
Q

The opening of the orifice in series with the relief valve in a TCM fuel pump used on a turbo charged engine is controlled by a bellows that senses the _________ or __________ pressure.

A

Upper deck

Turbocharger discharge

45
Q

A stable fuel pressure downstream of the metering jets under idling conditions is provided by the ________ valve in the fuel manifold

A

Poppet

46
Q

When checking the low unmetered fuel pressure, the engine is operated at its ________ RPM.

A

Idle

Powerplant Textbook Questions (5 decks)

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