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1. 1) What is N1 on a turbofan engine?

   N1 is the speed of the first spool of a two-spool engine, which on a turbofan is the big fan on the front.

   N1 is the speed of the first spool of a two-spool engine, which on a turbofan is the big fan on the front.

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2. 2) Nearly all modern turbofan engines found on passenger jets have:

   Axial flow engines compress air by moving it through smaller and smaller stages of the compressor.

   Axial flow engines compress air by moving it through smaller and smaller stages of the compressor.

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3. 3) Where does bypass air go on a turbofan engine?
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   Bypass air goes around the engine core, but still passes through the engine cowling. In most modern high-bypass turbofans, bypass air accounts for the majority of thrust produced by the engine.

   Bypass air goes around the engine core, but still passes through the engine cowling. In most modern high-bypass turbofans, bypass air accounts for the majority of thrust produced by the engine.

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4. 4) Which of the following parts rotate around the shaft of the compressor section?
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   The rotor blades spin around the shaft, and the stators are static. Some engines have variable stators that change pitch, but still don't rotate around the engine shaft.

   The rotor blades spin around the shaft, and the stators are static. Some engines have variable stators that change pitch, but still don't rotate around the engine shaft.

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5. 5) How much does 1 gallon of Jet A fuel weigh?

   According to the FAA, the standard weight of Jet A is 6.8 pounds per gallon.

   According to the FAA, the standard weight of Jet A is 6.8 pounds per gallon.

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6. 6) What is a compressor stall?

   A compressor stall is a local disruption of airflow in the engine. They can range in severity from a small drop in power to a complete loss of compression.

   A compressor stall is a local disruption of airflow in the engine. They can range in severity from a small drop in power to a complete loss of compression.

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