FAA Powerplant Written Practice Test

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Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

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What is one of the main effects of low cylinder head temperatures on spark plugs?

  1. Increased efficiency

  2. Spark plug fouling

  3. Reduced wear

  4. Improved throttle response

The correct answer is: Spark plug fouling

Low cylinder head temperatures can lead to spark plug fouling due to a combination of unburned fuel and the accumulation of carbon deposits. When the cylinder head temperature is lower than optimal, combustion may not reach the necessary temperature to fully ignite the fuel-air mixture. This incomplete combustion results in unburned fuel washing down the spark plugs and the formation of carbon deposits. Over time, these deposits can build up, leading to fouling, which interferes with the spark plug’s ability to ignite the fuel-air mixture effectively. Therefore, maintaining appropriate cylinder head temperatures is crucial to ensuring efficient combustion and preventing spark plug fouling.

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