Residential HVAC Installation Practice Exam

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Prepare for the Residential HVAC Installation Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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How often should the oil in a vacuum pump be changed?

Every month
After every 10 uses
After each time it is used
Once a year

The correct answer is: After each time it is used

The correct answer is after each time it is used because the oil in a vacuum pump plays a crucial role in maintaining the pump's performance and longevity. After each use, contaminants and moisture can accumulate in the oil, which can degrade the pump's efficiency and potentially damage its components. Therefore, changing the oil after each use helps ensure the vacuum pump operates optimally and avoids potential issues that may arise from using contaminated or degraded oil. Options A, B, and D are not the best choices because changing the oil on a more frequent basis (after each use) is essential for maintaining the vacuum pump's performance and longevity in the long run.