Aircraft Fuel SystemsAircraft & Engines — DGCA CPL practice questions
Question 1 of 5
The most common fuel tank type on large aircraft is the:
All 5 questions — Aircraft Fuel Systems
Aircraft & Engines · DGCA CPL. The correct option is marked on each.
Q1. The most common fuel tank type on large aircraft is the:
- A.Rigid tank
- B.Flexible bladder tank
- C.Integral tank (sealed wing structure)✓
- D.Drop tank
Why: Integral tanks use the sealed wing box itself as the tank — maximum capacity with no added tank weight.
Q2. Booster pumps in the tanks primarily serve to:
- A.Pressurise the cabin
- B.Supply fuel under low pressure to the engine pumps and prevent vapour lock✓
- C.Increase fuel temperature
- D.Mix the fuel additives
Why: Electric centrifugal pumps in the tanks keep positive pressure to the engine-driven pumps, preventing vapour lock at altitude.
Q3. Modern capacitive fuel gauging systems measure:
- A.Fuel volume
- B.Fuel mass (weight)✓
- C.Fuel temperature
- D.Tank pressure
Why: Measuring mass rather than volume stays accurate as fuel density changes with temperature.
Q4. The collector (feeder) tank is designed to:
- A.Vent excess fuel overboard
- B.Remain full during manoeuvres so the booster pumps never run dry✓
- C.Collect water from the fuel
- D.Store the fuel additives
Why: Located at the lowest point with the booster pumps, it guarantees fuel supply during attitude changes.
Q5. Cross-feed valves allow:
- A.Fuel jettison
- B.Fuel from any tank to feed any engine✓
- C.Refuelling in flight
- D.Mixing AVGAS with AVTUR
Why: Cross-feed and shut-off valves give supply flexibility and let a leaking tank or engine be isolated.