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Induction & Engine Airflow: Powerplant practice questions

Five original questions on induction & engine airflow, each with the answer, an explanation and an FAA-H-8083-32B page reference.

1. How does a carburetor alternate air door typically open?
  1. It is spring loaded closed and sucked open by engine suction if needed
  2. It is opened by the pilot only
  3. It is always open
Show answer

A. It is spring loaded closed and sucked open by engine suction if needed It provides airflow if the normal route is blocked.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-1

2. Where does warm air come from when carburetor heat is selected?
  1. From around the exhaust
  2. From the cabin heater
  3. From the oil cooler
Show answer

A. From around the exhaust This raises the intake air temperature.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-1

3. Is the turbine engine air-inlet duct normally considered part of the engine?
  1. No, it is normally considered an airframe part
  2. Yes, it is always part of the engine
  3. Only on turboprops
Show answer

A. No, it is normally considered an airframe part Even so, the duct is very important to engine performance and thrust.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-16

4. What does a carburetor air temperature indicator measure?
  1. Either the inlet air temperature or the fuel/air mixture temperature
  2. Cylinder head temperature
  3. Oil temperature
Show answer

A. Either the inlet air temperature or the fuel/air mixture temperature It serves as a guide for keeping induction temperatures in range.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-6

5. On the turbosupercharger installation described in the handbook, where is the induction air intake?
  1. A filtered ram-air intake on the side of the nacelle
  2. Inside the cabin
  3. Behind the propeller spinner only
Show answer

A. A filtered ram-air intake on the side of the nacelle An alternate air door admits heated engine-compartment air if the filter clogs.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-9

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What does the Powerplant test cover on induction & engine airflow?

The Aviation Mechanic Powerplant ACS lists induction & engine airflow as one of its areas. The FAA reference for this material is FAA-H-8083-32B.