NATE Air Conditioning and Heat Pumps Practice Exam

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Ace your NATE Air Conditioning and Heat Pumps Exam with our quiz. Prepare with detailed questions, hints, and thorough explanations to boost your confidence and guide your study journey. Get ready for success in your HVAC certification!

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How are hermetic compressor motors cooled?

With air drawn around the compressor shell by the condenser fan
With water circulated through tubing wrapped around the compressor shell
With suction vapor drawn from the evaporator
With a combination of air and water

The correct answer is: With suction vapor drawn from the evaporator

Hermetic compressor motors are typically cooled by utilizing the suction vapor drawn from the evaporator. In a refrigeration system, the compressor is designed to compress vapor refrigerant, which is in a low-pressure gaseous state when it enters the compressor. As the vapor moves through the compressor, it absorbs heat from the motor, effectively cooling it. This process allows the compressor to maintain a suitable operating temperature, ensuring efficient performance and longevity. The suction vapor is critical because it not only provides cooling but also ensures that the refrigerant is in the right state for the compression process. This method of cooling is efficient as it takes advantage of the existing refrigerant cycle, keeping the motor temperature in check without the necessity for additional cooling systems.