Residential HVAC Installation Practice Exam

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Prepare for the Residential HVAC Installation Exam with this comprehensive quiz. Test your knowledge with multiple-choice questions and get ready to excel in your HVAC installation career.

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!

Practice this question and more.

What are the clearance tolerances related to the use of ordinary clean refrigerant oil in a vacuum pump?

It is not recommended
It is only suitable at specific temperatures
It can be used satisfactorily
It is prohibited

The correct answer is: It can be used satisfactorily

Ordinary clean refrigerant oil can generally be used satisfactorily in a vacuum pump, as long as it is not contaminated by moisture or other impurities. Option A is incorrect because while it may not be recommended, it is still commonly used. Option B is incorrect because the suitability does not depend on specific temperatures. Option D is incorrect because it is not strictly prohibited, although certain types of oils may not be compatible with certain vacuum pump systems and precautions should be taken.