Modern Chapter 10 - Quiz Flashcards
Refrigerant ____ is the process of removing refrigerant from a system and storing it in a cylinder.
recovery
reclaiming
restoring
recycling
recovery
Which type of refrigerant cylinder is gray on the bottom and yellow on the top?
Service.
Storage.
Recovery.
Disposable.
recovery
A Bourdon tube ____ as pressure inside it increases.
closes
straightens
opens
bends
straightens
If the valve stem is turned counterclockwise as far as possible, the service valve is in the ____ position.
back seated
front seated
cracked open
None of the above.
backseated
What percentage of moisture and particulates must be removed from reclaimed refrigerants?
50%
75%
90%
100%
100%
Vacuum pump oil turns ____ when it is contaminated by water.
green and pale
white and foamy
brown and thick
black and runny
white and foamy
Halogens cause the torch of a flame to turn ____ when they are brought into contact with heated copper.
green
red
blue
white
green
Which type of gauge is designed to read pressure values on a single continuous scale and be used on the high side of a system?
Compound gauge.
Vacuum gauge.
Low-side gauge.
High-pressure gauge.
high-pressure gauge
A gauge should not be exposed to pressure greater than ____ of its full-scale range for more than a few minutes.
40%
50%
60%
75%
75%
Drawing an extremely low pressure in a refrigeration system is necessary to remove ____ from the system.
leaks
moisture
light
heat
moisture
A suction service valve connects to the suction line and directly onto the ____.
accumulator outlet
compressor at its inlet
liquid receiver outlet
suction-line filter-drier
compressor at its inlet
All refrigerant cylinders should be secured with ____ when they are being transported.
a chain
tightly packed bubble wrap
corrugated cardboard sheets
large sacks of flour
a chain
When using a digital charging scale, a technician must know the ____ weight of a cylinder, which is its weight when it is empty.
tare
valve
seat
empty
tare
Each time a recovery/recycling machine is used, the filter-drier should be changed.
True False
true
Electronic leak detectors can only be used to detect CFCs.
True False
false
Disposable cylinders are designed to be used for refrigerant recovery.
True False
false
Refrigerant must be recovered from a leaking system before repairs can be performed.
True False
true
Refrigerant is reclaimed on the job site.
True False
false
A gauge that reads absolute pressure should be adjusted depending on the elevation.
True False
false
The pressure of a perfect vacuum is 29.92 in. Hg.
True False
true
Both valves need to be closed on a gauge manifold in order to evacuate a system.
True False
false
Recovery cylinders are often equipped with two valves: one for vapor and one for liquid.
True False
true
A decrease in temperature can cause the pressure in a cylinder to increase.
True False
false
The compound gauge measures pressure both above and below atmospheric pressure.
True False
True
