AMT Aircraft Fuel Systems 2

Question 1

What is the purpose of a crossfeed system in a multi-engine aircraft?

Accepted Answer

To allow any engine to draw fuel from any onboard fuel tank

Answer

To transfer fuel between main and auxiliary tanks of the same engine

Answer

To pressurize all fuel tanks simultaneously for high-altitude operations

Answer

To automatically balance fuel loads during refueling

Question 2

What type of filter or strainer is most commonly used in aircraft fuel systems to remove particulate contamination?

Accepted Answer

Mesh screen or sintered bronze strainer

Answer

Pleated paper element filter

Answer

Activated charcoal filter element

Answer

Magnetic particle separator

Question 3

What condition causes vapor lock in an aircraft fuel system?

Accepted Answer

Fuel temperature rises and vaporizes in the lines, creating bubbles that disrupt flow

Answer

Fuel pressure becomes excessively high and ruptures the fuel line

Answer

Water contamination freezes in the fuel lines during high-altitude cruise

Answer

A clogged fuel filter causes suction that collapses the fuel pickup tube

Question 4

What does a fuel pressure regulator do in a fuel-injected piston aircraft engine?

Accepted Answer

Maintains a constant fuel pressure to the fuel injector manifold regardless of pump output variations

Answer

Increases fuel pressure automatically for high-altitude operations

Answer

Regulates fuel temperature by controlling flow rate through a heat exchanger

Answer

Controls total fuel quantity delivered from tanks to the distribution manifold

Question 5

What is the purpose of fuel tank sumps in aircraft fuel systems?

Accepted Answer

To collect water and sediment at the tank's lowest point so they can be drained during preflight

Answer

To increase usable tank capacity by using otherwise dead space

Answer

To provide structural reinforcement to the bottom of the fuel tank

Answer

To house the capacitance probes used by the fuel quantity gauging system

Question 6

What color is AVGAS 100LL dyed to prevent misfueling?

Accepted Answer

Blue

Answer

Clear/colorless

Answer

Straw yellow

Answer

Red

Question 7

What is the primary purpose of a fuel jettison (dump) system installed on large transport-category aircraft?

Accepted Answer

To rapidly reduce aircraft gross weight to below maximum landing weight during an emergency return

Answer

To purge contaminated or degraded fuel from tanks before landing

Answer

To transfer fuel from center tanks to wing tanks during cruise for CG management

Answer

To pressurize fuel tanks before descent to prevent vapor lock at low altitude