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PPL Aircraft General > Fuel System > Flashcards

Fuel System Flashcards

1
Q

What components prevent fuel surging about in flight in tanks?

A

Baffles

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2
Q

What do baffles do?

A

Prevent fuel surging about in-flight

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3
Q

What is higher up? Fuel supply line or fuel sump?

A

Fuel supply line

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4
Q

Why is the fuel supply line not at the bottom of a fuel tank?

A

To prevent impurities that have collected at the bottom being fed into the engine

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5
Q

What is the result of having a fuel supply line not at the very bottom of a fuel tank?

A

There will always be an unuseable quantity of fuel

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6
Q

How is unuseable fuel possible?

A

Fuel supply line is above the fuel sump

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7
Q

What is necessary for atmospheric pressure to be maintained in fuel tanks?

A

Fuel vents

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8
Q

What do fuel vents do?

A

Retain atmospheric pressure in fuel tanks

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9
Q

What would happen if the pressure in a fuel tank reduced?

A

Reduce the fuel flow rate and cause the tanks to collapse inwards

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10
Q

Reduction of the fuel flow rate and tanks collapsing inwards is a result of what?

A

Reduced pressure in fuel tanks (and insufficient venting)

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11
Q

What component alleviates increased pressure in fuel tanks?

A

Overflow drain

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12
Q

What do overflow drains do?

A

Alleviate excess pressure in fuel tanks

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13
Q

When does fuel NOT pass through a carburettor?

A

When the engine is primed

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14
Q

Locking the fuel primer in-flight prevents what?

A

The cylinders receiving excessive fuel and thus failing due to too-rich a mixture

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15
Q

What might cause an engine to receive excessive fuel if the mixture control is set correctly?

A

Fuel primer is not locked

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16
Q

What should be done to the throttle if re-starting the engine due to incorrect fuel selection?

A

It should be closed to prevent a power surge

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17
Q

Why should the throttle be closed when re-starting an engine after incorrect fuel selection?

A

To prevent a power surge

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18
Q

What component purges the fuel lines of vapour?

A

Fuel boost pumps

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19
Q

Fuel boost pumps are also known as?

A

Auxiliary pumps

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20
Q

Auuxiliary pumps are also known as?

A

Fuel boost pumps

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21
Q

What component is used for simple fuel quantity indicators?

A

A float

22
Q

Electric fuel quantity indicators often use what electrical system?

A

DC

23
Q

How do electric fuel quantity indicators operate?

A

Float movement correlates with a variable resistor, changing the current flowing to a gauge
Current alters a magentic field, moving a pointer in the gauge

24
Q

What aspect of a gauge is altered in an electric fuel quantity indicator?

A

A magnetic field

25
Q

What kind of gauge is often used for fuel pressure indicators?

A

Bourdon tube gauge

26
Q

What shape is a Bourdon tube gauge?

A

ā€˜Cā€™ shape

27
Q

How does a Bourdon tube gauge operate?

A

Fluid enters the fixed end
Pressure change will move the free end of the tube

28
Q

A pressure increase in a Bourdon tube will do what?

A

Straighten the tube

29
Q

A pressure decrease in a Bourdon tube will do what?

A

Curve the tube

30
Q

Why is Bourdon tube gauge appropriate for light aircraft fuel systems?

A

The gauge is in close proximity to the engine

31
Q

What is often used for fuel flow gauges?

A

Existing pressure gauge that is calibrated to show fuel flow

32
Q

A fuel pressure gauge can also be recalibrated to indicate what?

A

Fuel flow

33
Q

What is an important facet of fuel flow gauges in fuel-injected systems?

A

A blocked fuel injector will incorrectly read a higher fuel flow

34
Q

Why does a blocked fuel injector incorrectly read a higher fuel flow in light aircraft systems?

A

Fuel flow is measured by fuel pressure, so a blockage results in a higher pressure (and thus fuel flow indication)

35
Q

What colour is Kerosene?

A

Straw

36
Q

What fuel is straw-coloured?

A

Kerosene

37
Q

100LL AVGAS is what colour?

A

Blue

38
Q

Blue-coloured fuel is usually what fuel grade?

A

100LL AVGAS

39
Q

What is added to higher octane fuels to improve anti-detonation qualities?

A

Lead

40
Q

Why might lead be added to a fuel?

A

Improve anti-detonation qualities

41
Q

What does a higher rating/grade of a fuel indicate?

A

Greater anti-detonation qualities

42
Q

What does a higher fuel performance number indicate practically?

A

The power possible (compared to reference fuel) before a rich mixture would detonate

43
Q

What could occur if using a higher grade fuel than specified?

A

Spark plug fouling and greater exhaust valve erosion

44
Q

What causes spark plug fouling and greater exhaust valve erosion?

A

Use of higher grade fuel than speciified

45
Q

Kerosene is also known as what?

A

Avtur

46
Q

Using motor fuel in an aircraft would cause what?

A

Lower power output, spark plug fouling and detonation

47
Q

What is vapour lock?

A

Vaporisation in fuel lines blocks fuel flow

48
Q

What is the term given to vaporisation in fuel lines blocking fuel flow?

A

Vapour lock

49
Q

What can help minimise fuel tank condensation?

A

Leaving fuel tanks completely full

50
Q

What is the advantage to leaving fuel tanks overnight completely ful?

A

Prevents fuel tank condensation

PPL Aircraft General (10 decks)

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