Test on Aircraft Fuel Systems: Components and Safety

Question 1: Is the only location for fuel system strainers in the outlet to the tank?

A. Ano

B. Ne

Explanation: Fuel system strainers are located in the outlet to the tank, and a main strainer is also located in the fuel line between the outlet of the fuel tank and the inlet to the fuel metering device.

Question 2: Turbojet aircraft normally have fuel temperature indicators primarily to ensure the fuel remains at its optimal combustion temperature for maximum thrust.

A. Ano

B. Ne

Explanation: Turbojet aircraft have fuel temperature indicators because of the low temperatures at which these aircraft operate, which can cause water to precipitate out of the fuel and freeze on the filters, shutting off fuel to the engines. The indicators help to keep the temperature above freezing by directing fuel through a heater, not to monitor optimal combustion temperature.

Question 3: Which device serves as a flowmeter for a fuel-injected, horizontally opposed aircraft engine?

A. A pressure gage that measures the pressure drop across the injector nozzles

B. An electronic capacitance type gage

C. A mass-flow fuel flowmeter

D. A sight glass that measures the volume of fuel

Explanation: For a fuel-injected, horizontally opposed aircraft engine, a pressure gage that measures the pressure drop across the injector nozzles is used as a flowmeter.

Question 4: What is the primary purpose of a drip gage found in the fuel tank of a large aircraft?

A. To measure the density of the fuel for the fuel flowmeter.

B. To allow a mechanic to check the fuel level in a tank from the bottom of the tank.

C. To indicate when fuel is at risk of vapor locking at high altitudes.

D. To ensure the proper grade of fuel is being used in the aircraft.

Explanation: The drip gage allows a mechanic to check the fuel level in a tank from the bottom of the tank.

Question 5: Chemical fumes can be decontaminated by using boiling water.

A. Ano

B. Ne

Explanation: Decontamination of chemical fumes can be accomplished by boiling water.