A/C Service and Refrigeration Exam Questions with Correct Answers
5 views 0 purchase
Course
Refrigeration machine operator
Institution
Refrigeration Machine Operator
flash-gas - Answer-The presence of ___________ in the liquid lines reduces the efficiency of the refrigeration cycle, leads several expansion systems to work improperly and, increases superheating in vapor.
A1 - Answer-According to ASHRAE refrigerant safety classification standard which designat...
A/C Service and Refrigeration Exam
Questions with Correct Answers
flash-gas - Answer-The presence of ___________ in the liquid lines reduces the
efficiency of the refrigeration cycle, leads several expansion systems to work improperly
and, increases superheating in vapor.
A1 - Answer-According to ASHRAE refrigerant safety classification standard which
designation would be the safest ?
Attach DOT classification tags - Answer-When transporting cylinders containing used
refrigerant, DOT requires that you ?
CFC - Answer-What compound has the highest ozone depletion potential (ODP) ?
yellow tops and gray bodies - Answer-Approved refrigerant recovery cylinders can be
identified by which color code ?
ARI 700 - Answer-Under EPA's regulations, what standard must reclaimed refrigerant
meet before it can be resold ?
a low pressure vapor. - Answer-The state of refrigerant entering the compressor of a
refrigeration system is ?
a condenser or, an evaporator - Answer-Replacement of ________________ is a repair
which would always be considered major under EPA's regulations.
recycling. - Answer-Refrigerant that is cleaned using oil separation and single or
multiple passes through devices, such as replaceable core filter-driers, which reduce
moisture, acidity, and particulate matter is ___________________.
electronic leak detector - Answer-Which leak detection method is most effective for
locating the general area of the small leak ?
PSIG and inches of mercury - Answer-A compound pressure gauge for the low side of a
system measures pressure in ?
traces of oil - Answer-When first inspecting a hermetic system known to be leaking you
should first look for ?
only charge with nitrogen vapor and use a regulator. - Answer-When charging a system
with nitrogen ______________.
, saturated or sub-cooled high-pressure liquid - Answer-Refrigerant entering the Thermal
Expansion Device of an R-22 heat pump is ___________.
hydrochloric and hydrofluoric acid or, phosgene gas. - Answer-At high temperatures R-
12 and R-22 can decompose to form _____________.
oxygen deprivation - Answer-According to ASHRAE Standard 15 a sensor and alarm
are required for type A-1 refrigerants to sense ___________.
sight glass - Answer-A __________ is not a method presently used for checking the fill
level in a recovery tank.
number of cylinders of each gas - Answer-Dot regulations 49 CFR requires that the
___________ be recorded on the shipping paper for a hazard class 2.2 non flammable
compressed gas.
wearing a respirator - Answer-Which of the following is not a standard recommended
safe work practice when recovering refrigerants ?
the charge is more than 15 pounds - Answer-System dependent recovery equipment
cannot be used when ______________.
processed so that it meets the standard for new refrigerant. - Answer-Reclamation of a
refrigerant means that it is ______________.
boil off or, vaporize - Answer-The principle of evacuating a system using a vacuum
pump is to lower the system pressure so any moisture can ________________.
the system to work harder due to increase in condensing temperature. - Answer-Air in a
refrigeration system mainly causes ____________.
micron gauge - Answer-The most accurate way to measure a vacuum is with a
___________.
500 - Answer-What is the micron level to which a system should be evacuated down
to ?
both liquid and vapor refrigerant - Answer-When charging refrigerant by weight you can
charge with _____________.
refrigerant liquid at the expansion device - Answer-The sub-cooling charging method
gives an introduction to the amount of __________.
fractionation - Answer-What is the process called when each of the refrigerants used in
a blended refrigerant leak at a different rate if released into the atmosphere changing
the proportions of the refrigerants used in the blend ?
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 lectknancy. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.49. You're not tied to anything after your purchase.
