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DGCA Technical General · 35 questions

Fuel Systems: DGCA Technical General Questions and Answers

35 practice questions on Fuel Systems with answers and explanations, plus the key concepts and formulas, from the TrueHeading question bank.

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About this topic

Use this page to revise Fuel Systems for the DGCA Technical General paper. Below are the key ideas first, then 12 practice questions with answers and explanations, picked from the 35 questions in the TrueHeading bank for this topic.

In short: Tanks, boost pumps, cross-feed, filters, and fuel heaters.

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Key concepts: Fuel Systems

2 ideas to know cold.

Fuel system essentials?

Tanks, boost pumps, cross-feed, filters, and fuel heaters.

  • Capacitance probes measure mass of fuel
  • Drain water from sumps before flight
  • Fuel jettison may reduce landing mass

Describe a typical airliner fuel system.

Tanks (wing, centre), boost pumps, crossfeed, fuel shut-off valves, vents, fuel quantity (capacitance probes), jettison on some.

  • Fuel temperature monitored for freezing (−47 °C for Jet A-1)
  • Water drained at sumps
  • Fuel heater prevents filter icing

Practice questions: Fuel Systems

Tap “Show answer” after you have tried each one.

Q11000 litres of fuel of relative density 0.8 have a mass of:

  1. 1760 kg
  2. 800 kg
  3. 1250 kg
  4. 200 kg
Show answer

Answer: B. 800 kg

Mass = volume × density.

Q22500 litres of fuel of relative density 0.8 have a mass of:

  1. 2000 kg
  2. 500 kg
  3. 3125 kg
  4. 4400 kg
Show answer

Answer: A. 2000 kg

Mass = volume × density.

Q3120 litres of fuel of relative density 0.72 have a mass of:

  1. 33.6 kg
  2. 86.4 kg
  3. 190.08 kg
  4. 166.667 kg
Show answer

Answer: B. 86.4 kg

Mass = volume × density.

Q41800 litres of fuel of relative density 0.8 have a mass of:

  1. 360 kg
  2. 2250 kg
  3. 1440 kg
  4. 3168 kg
Show answer

Answer: C. 1440 kg

Mass = volume × density.

Q575 litres of fuel of relative density 0.72 have a mass of:

  1. 21 kg
  2. 118.8 kg
  3. 54 kg
  4. 104.167 kg
Show answer

Answer: C. 54 kg

Mass = volume × density.

Q6300 litres of fuel of relative density 0.8 have a mass of:

  1. 240 kg
  2. 60 kg
  3. 375 kg
  4. 528 kg
Show answer

Answer: A. 240 kg

Mass = volume × density.

Q7Fuel tank vents are provided to:

  1. increase the fuel load
  2. warm the fuel
  3. let fuel escape
  4. allow air in as fuel is used, preventing a vacuum
Show answer

Answer: D. allow air in as fuel is used, preventing a vacuum

They also relieve pressure due to temperature.

Q8Fuel jettison (dump) is used to:

  1. cool the engines
  2. reduce the landing weight in an emergency
  3. increase the take-off weight
  4. balance the passengers
Show answer

Answer: B. reduce the landing weight in an emergency

Only on aircraft equipped with a dump system.

Q9A fuel heater (oil-fuel heat exchanger) prevents:

  1. fuel from burning
  2. evaporation
  3. fuel from boiling
  4. ice crystals forming in the fuel and blocking the filter
Show answer

Answer: D. ice crystals forming in the fuel and blocking the filter

Fuel absorbs engine oil heat.

Q10Water in the fuel is most likely to collect:

  1. at the top
  2. in the vent
  3. at the lowest point of the tank (sumps)
  4. in the filler cap
Show answer

Answer: C. at the lowest point of the tank (sumps)

Water is denser than fuel and sinks; drain samples before flight.

Q11The colour of AVGAS 100LL is:

  1. red
  2. blue
  3. green
  4. clear
Show answer

Answer: B. blue

Aviation gasoline grades are colour-coded.

Q12Fuel density increases when the temperature:

  1. reaches 100 °C
  2. is the same
  3. increases
  4. decreases
Show answer

Answer: D. decreases

A given volume weighs more in cold weather.

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More DGCA Technical General topics

Aerodynamics & Performance181 QFlight Controls & Stability38 QAirframe & Structures25 QPowerplant79 QPropellers32 QAircraft Systems116 QPitot Statics35 QBarometric Altimeters61 QRadio Altimeters37 QVertical Speed Indicators (VSI)32 QAirspeed Indicators24 QAirspeeds41 QMach55 QGyroscope52 QAttitude Indicators20 QTurn and Slip50 QINS, IRS and FMS32 QEFIS24 QAutoflight23 QFlight Director21 QEICAS / ECAM24 QEngine Instruments29 QTemperature Indicators34 QCompass54 QWarning & Recording Systems33 QTCAS39 Q
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