Test on Aircraft Engine Fuel Systems

Question 1: The acceleration system on an aircraft carburetor operates when the throttle is suddenly opened.

A. Ano

B. Ne

Explanation: The acceleration system on an aircraft carburetor operates when the throttle is suddenly opened.

Question 2: Boost pumps in an aircraft fuel system are designed to direct excess fuel from a pressure relief valve back to the inlet side of the pump.

A. Ano

B. Ne

Explanation: Boost pumps provide fuel pressure for starting the engine, pressurize fuel lines to prevent vapor lock, and transfer fuel from one tank to another. The function of directing excess fuel back to the inlet side is described for an engine-driven fuel pump, not a boost pump.

Question 3: What is the primary reason an aircraft reciprocating engine is killed by placing the mixture control in the Cutoff position instead of using the magneto switch?

A. To cool down the engine cylinders more rapidly.

B. To leave the combustion chambers full of air with no fuel, making the engine less likely to fire if the propeller is accidentally moved.

C. To prevent backfiring when the engine is shut down.

D. To ensure all remaining fuel is burned off before shutdown.

Explanation: Placing the mixture control in the Cutoff position shuts off fuel to the cylinders, leaving the combustion chambers full of air with no fuel. This makes the engine less likely to fire if the propeller is pulled through with the ignition switch accidentally on.

Question 4: According to the study materials, where must the engine fuel shutoff valve be located?

A. On the same side of the firewall as the engine

B. On the side of the firewall away from the engine

C. Inside the aircraft cabin

D. Adjacent to the fuel boost pump

Explanation: The study materials state that the shutoff valve must be on the side of the firewall away from the engine.

Question 5: Does not facing the wind when trimming cause the boat's engine to stall?

A. Ano

B. Ne

Explanation: The study materials state that not facing the wind will cause faulty trimming, not that it will cause the engine to stall.