RAC 40 Quiz 8 Review Questions with 100% Correct Answers
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Course
RAC 40
Institution
RAC 40
RAC 40 Quiz 8 Review Questions with 100% Correct Answers
What are some ways they can increase the productivity of the dehydration and evacuation process? list all you can think of - Answer- -purge system with nitrogen before pulling vacuum
-heat up and kick compressors to get out all the moist...
RAC 40 Quiz 8 Review Questions
with 100% Correct Answers
What are some ways they can increase the productivity of the dehydration and
evacuation process? list all you can think of - Answer- -purge system with nitrogen
before pulling vacuum
-heat up and kick compressors to get out all the moisture and oil from underneath
-use copper tubing instead of vacuum hoses
-make sure vacuum pump oil is new and vacuum pump
When non condensables and moisture are left in a system hydrochloric and hydroscopic
acids will form and deteriorate the motor windings and cause copper plating. - Answer-
False: hydrofluoric not hydroscopic
List some ways to clean out contaminants from motor burn out on a semi hermetic
compressor. list all you can think of - Answer- -drain oil
-replace liquid line dryer
-triple evacuate system
-use acid away to flush system
Name the 6 different types of leaks - Answer- 1. temperature dependent
2. Pressure dependent
3. Vibration dependent
4. Standing pressure leak
5. cumulative micro leak.
6. Combination leak
Leaks can flow under ... - Answer- -flux
-paint
-Rust
-pipe insulation
we need to wash down leaks after checking with soap or it will .... - Answer- Corrode,
Get in system, rust
how many microns in an inch? - Answer- 25,400
how would you remove sludge from your system? - Answer- Get a sludge cleaning
compound and wash it out from the system
if electroplating has happened in your system what would you find if you were to open
up your system? and what parts should you check? - Answer- UNANSWERED
, one pound of water equals to a _________ in a system and will turn into __________
ft3 of vapor if boiled at 70 degrees - Answer- pint, 867
if i have a sporland 164-S-HH in my truck, what is this? and what do the numbers and
letters mean? - Answer- 16= cub vol
4= 1/2''
S= solder
HH= Acid
why should you not start a hermetic compressor that is in a deep vacuum? what is the
outcome? - Answer- A short will happen because there is no insulation for the
compressor terminals from the refrigerant and oil
After repairing a System that has had an electrical motor failure (compressor burnout) it
is good field practice to re-use the recovered refrigerant in that system - Answer- False
Air entering a refrigerant system can eventually lead to compressor failure - Answer-
True
The maximum recommended pressure for leak testing is 150 PSIG on the low pressure
side of the system - Answer- True
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 - Answer- False
Clearance tolerance are such that the ordinary clean refrigerant oil can be used
satisfactorily in a vacuum pump - Answer- False
The oil in a vacuum pump should be changed after each time it is used - Answer- True
When using a standing pressure test for leak checking _________________ should
never be used since an explosive mixture can be created - Answer- Oxygen
Only two substances should be in the refrigeration system for proper operation they are
______________ and oil - Answer- Refrigerant
____________ Microns is equal to 1mm Hg. - Answer- 1000
The electronic vacuum gauge is attached to the system so it can measure the
pressure__________ the system - Answer- inside
A deep vacuum involves reducing the pressure in a refrigeration system to a micron
gauge reading of ____________ or below - Answer- 250
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