FUEL SYSTEM - Dgca question bank for pilots

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#1. Vapour locks are caused by ________ Blocking the flow?

Evaporated fuel

Water vapour

Air

Anti-icing agent

#2. Fuel tanks are vented through?

The fuel feed lines

The bleed lines

The return lines

Pressure relief values at the wing tips

#3. When does fuel flow from a filling vehicle stop?

When the surge tanks are full

When a certain pressure has been reached.

When a certain volume or mass has been reached

When the tanks are full

#4. What is the maximum amount of fuel that can be jettisoned?

All of it

15 tons

Down to a pre-determined reserve.

Down to maximum landing weight

#5. What is the purpose of the refuelling volumetric top off limit?

To allow for thermal expansion of the fuel.

To allow for thermal contraction of the fuel

To close off the fuelling valve when the tanks are full

To limit maximum fuel load

#6. A modern twin jet aircraft would normally be refuelled using?

Overwing refulling

Underwing refuelling

Pressure refuelling

Suction refuelling

#7. What is the function of the feeder box in a twin jet fuel system?

To ensure fuel is distributed evenly during refuelling.

To ensure each engine gets the same fuel flow

To ensure each engine gets an adequate fuel flow

To prevent cavitation of the HP fuel pumps

#8. Aircraft fuel tanks are normally filled by?

Fuel sucked from the bowser by the aircraft fuel pumps

Fuel pumped from the bowser by its own fuel pumps.

Gravity

Air pressurisation of the bowser fuel tanks

#9. A fuel LP booster pump pressure sensor typically uses?

An aneroid capsule.

A differential capsule

A bellow.

A bourden tube

#10. The advantages of float-type fuel gauging systems include? 1. Simplicity 2. Lightness and cheapnes. 3. Accuracy 4. Reliabiliy

1, 2

1, 3

2, 4

All of the above

#11. Fuel booster pumps are usually?

Centrifug high pressure units.

Centrifug allow pressures units.

Spur- genallow pressure units

Spur gearigh pressure units.

#12. A float-type fuel gurging system will not be affected by?

Voltage sugly variations if it uses a galvanometer

Attitude changes if it uses a galvanometer

Voltage sugly changes if i uses a ratiometer

Attitude changes if it uses a ratiometer

#13. When an aircrafftical system contains a small quantity of water but no fuel, its capacitive fuel gaging system will.

Overheat.

Read zero.

Read full

Read almost zero

#14. Precautions to broken when refueling an aircraft include?

GPU and must not be running

No radar HF transmissions with 10 m.

Fuel filler must be bonded before delivery commences.

Fire extin s must be available if there are any people in the area.

#15. In 100 LL AVGAShe relates to its?

Pre-ignitionesistance properties.

Anti-knocknowge perities

Calorific value.

Volatility

#16. Aircraft fuel tanks are pressurised using?

Bleed air

Supercharger air

Pack output air

Booster pumps.

#17. Vapour locks are caused by?

Icing

Evaporation of water in the fuel

Evaporation of fuel

Evaporation of fuel system lcing inhibitor

#18. Fuel pumps are located in the bottom of aircraft fuel tanks in order to?

Prevent them from over heating

Prevent pressure losses due to long delivery pipes.

Prevent boiling of fuel in delivery lines

Pressurise the tanks

#19. The purpose of surge boxes in fuel tanks is to?

To minimise the loss of fuel through the vent lines

To prevent compressor surge due to over-fuelling of the engine

To prevent excessive movement of fuel when the aircraft manoeuvres.

To keep the main tanks pressurised

#20. The purpose of baffles in wing fuel tanks?

To ensure even flow all tanks

To prevent excessive movement of fuel during manoeuvres.

To prevent the fuel from draining from one wing to the other when banked

To reduce the flow rate to manageable proportions when pressure refuelling.

#21. Fuel is normally used from?

The wing tanks first

The centre tanks first

The crossfeed tanks first

The rear tanks first

#22. Supercharging?

Increase the octane rating of the fuel

Decrease the octane rating of the fuel

Increases the octane rating required

Decreases the octane rating required

#23. The indications in a compensated capacitive fuel gauging system?

Increase with increasing temperature.

Decrease with increasing temperature

Are not affected by temperature

Increase if water is present in the fuel

#24. The disadvantages of a float type fuel gauging system include inaccuracies due to? 1. Changes in aircraft attitude. 2. Acceleration. 3. Amblent pressure changes. 4. Amblent temperature changes.

1, 2, 3.

1, 2, 4.

2, 3, 4.

1, 3, 4.

#25. A capacitive fuel gauging system measures?

Changes in capacitance of the fuel

Changes in capacitance due to variations in the proportion of sensors

Changes in capacitance of fuel due to density changes

Changes in dielectric constant of fuel

#26. What type of sensor if used to measure pressure output of an LP fuel booster pump?

Bourden tube

Capacitor.

Aneroid capsule

Bellows.

#27. A capacitive fuel gauging system can calculate the mass of fuel by using the fact that?

Fuel dielectric constant is proportional to p and twice that of air.

Fuel dielectric constant is equal to 1/p and proportional to that of air.

Fuel dielectric constant is equal to p and proportional to that of air.

Fuel dielectric constant is proportional to 1/p and equal to that of air.

#28. The fundamental principle of a capacitive fuel gauging system is?

Changes in capacitive reactance

Changes in reactive capacitance.

Constant reactive capacitance

Variations in dielectric constant of fuel

#29. A volumetric fuel flow meter differs from mass flow meter in that only the latter compensates for?

Changes in density

Changes in fuel dielectric constant

Changes in mass of fuel

Changes in fuel pressure

#30. An aircraft with a compensated capacitive fuel gauging system is refuelled to a fuel load of 45000 kg. If the temperature of the fuel then falls from 15° C to- 40° C in flight, how will the indications vary? (ignore fuel usage in flight)

No change.

Increase.

Decrease

Depends upon density and type of fuel

#31. A fuel flow meter measures?

The mass flow of fuel

The volumetric flow of fuel

The density of fuel

The mass flow or volumetric flow of fuel depending on type of system

#32. The disadvantages of a float type fuel gauging system include? 1. Errors due to acceleration 2. Errors due to changes in aircraft attitude. 3. It requires an AC power supply. 4. It requires a DC power supply. 5. Errors due to thermal expansion and contraction of fuel. 6 Errors due to refuelling with different fuel grades.

1, 2, 3, 5, 6.

1, 2, 5, 6.

1, 2, 3, 4.

1, 2, 4, 5.

#33. A mass flow meter is better than a volumetric flow meter because it is able to?

Compensate for density changes

Compensate for pressure changes

Compensate for changes in fuel calorific value

Compensate for changes in fuel viscosity.

#34. Fuel mass flow rate is more important than volumetric flow rate because?

Fuel costs are calculated by mass

Calorific value is proportional to mass.

Calorific value is proportional to volume

Fuel air ratio is based on mass

#35. Modern turbojet or turboprop aircraft are likely to employ?

Volumetric fuel flow gauges

Mass fuel flow meters

Spectrometric fuel flow meters.

Capacitive fuel flow meters.

#36. Modern turbojet and turboprop aircraft are likely to employ?

Torque type mass fuel flow meters

Venturi type fuel flow meters

Variable orifice fuel flow meters

Turbine impeller type fuel flow meters.

#37. If the tanks of an aircraft employing a capacitive fuel gauging system become filled with water, the gauge will?

Read almost empty

Read almost full

Read normally

Read zero

#38. The advantages of a float type fuel gauging system include? 1. Automatically compensates for density changes. 2. It is simple and cheap. 3. Compensates for thermal expansion and contraction. 4. Compensates for attitude changes.

1, 2, 3, 4.

2, 3, 4.

2, 4.

#39. A float type fuel gauging system?

Is sensitive to variations in system voltage if it employs a galanometer.

Is sensitive to variations in system voltage if it employs a ratiometer

Depends upon changes in system voltage

Is independent of variations in system voltage

#40. Fuel contents indications in a light aircraft

Are always likely to be accurate.

Are always likely to be inaccurate

Are likely to be inaccurate except in straight and level constant speed flight.

Are likely to be accurate except when taking-off and landing

#41. Light aircraft are usually refuelled by the?

Overwing method

Underwing method

Open line method

Pressure method

#42. Large aircraft are usually refuelled by the?

Overwing method.

Underwing method

Open line method

Pressure method

#43. Fuel tanks in modern large aircraft are normally of the?

Flexible type

Integral type

Rigid type

Unpressurised type

#44. Flexible fuel tanks?

Collapse when empty.

Require sealed compartments

Do not require sealed compartments.

Are less crash resistance than integral fuel tanks

#45. Fuel tanks in high altitude aircraft may be pressurised to?

Prevent freezing of the fuel

Prevent the formation of wax particles in the fuel

Prevent boiling of the fuel

Prevent expansion of the fuel

Finish