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 the purpose of an after cooler on a turbocharged reciprocating engine?

To increase fuel efficiency
To reduce engine noise
To cool turbocharged air entering the induction system
To enhance throttle response

The correct answer is: To cool turbocharged air entering the induction system

The purpose of an after cooler on a turbocharged reciprocating engine is to cool the turbocharged air entering the induction system. When air is compressed by the turbocharger, its temperature increases due to the adiabatic heating effect. This hot air can lead to reduced engine performance and increased likelihood of engine knock, which can cause damage during operation. By implementing an after cooler, the hot compressed air is routed through a heat exchanger, allowing it to transfer heat to a cooling medium, usually ambient air or coolant. This results in cooler, denser air entering the engine cylinders, thereby improving combustion efficiency, increasing horsepower, and reducing the chance of detonation. This step is crucial in ensuring that the engine operates efficiently under higher power conditions typical of turbocharged applications.