RESIDENTIAL HVAC INSTALLATION EXAM QUESTIONS WITH COMPLETE SOLUTIONS VERIFIED GRADED A+
Clearance tolerances are such that the ordinary clean refrigerant oil can be used satisfactorily in a vacuum pump.
false
The maximum recommended pressure for leak testing is 150 psig on the low-pressure sid...
Clearance tolerances are such that the ordinary clean refrigerant oil can be used
satisfactorily in a vacuum pump.
false
The maximum recommended pressure for leak testing is 150 psig on the low-
pressure side of the system.
true
Noncondensable gases ____.
are undesirable in a refrigeration system
To pull a vacuum means to ____.
lower the pressure in a refrigeration system below atmospheric
A(n) _ pressure could also mean refrigerant vapor is still seeping from the
refrigeration system.
high-rising
A deep vacuum involves reducing the pressure in a refrigeration system to a
micron gauge reading of _ or below.
500 or below.
Micron gauge displays can be electronic analog, digital, or _.
light emitting
A multiple evacuation means that ____.
you pull a vacuum on a refrigeration system more than once, allowing refrigerant or
nitrogen into the system between each procedure
To insure accurate testing, the best material to use for connecting lines to the
vacuum pump and gauge set is ____.
copper tube
The oil in a vacuum pump should be changed after each time it is used.
, true
There are _ microns in 1 mm Hg.
1,000
Air entering a refrigerant system can eventually lead to compressor failure.
true
A micron gauge is used to measure ____.
absolute pressures below 1 mm Hg
The electronic vacuum gage is attached to the system so it can measure the
pressure _ the system.
inside
Moisture in a liquid state must be ____ before it can be removed with a vacuum
pump.
vaporized
While under a deep vacuum, any liquid water under the oil in the motor-
compressor assembly can be removed by operating the compressor motor for
several seconds without any adverse effect on the system.
false
When using a "standing pressure test" for leak-checking, _ should never be used
since an explosive mixture can be created.
oxygen
When moisture is present in a refrigeration system, it will react with the
refrigerant and the oil to form ____.
acid
A compound gauge ____.
all of the above
The best method of leak checking is when the refrigeration system is ____.
standing with dry nitrogen pressure of 150 psig in the system
At what pressure range does the technician valve off the vacuum pump when
evacuating to a deep vacuum?
500-300 microns
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller NurseAdvocate. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
