WorksheetsType 3 Quiz
Total questions: 20
Worksheet time: 10mins
The purpose of a hydrostatic tube test is to:
determine if a tube has refrigerant in it
determine if a tube is leaking
determine if the pressure inside of the tube is less than required
none of the above
A chiller containing 150 pounds of HCFC refrigerant is leaking above the leak rate threshold. The repair must be completed within ___days unless granted additional time.
repair within 60 days
repair within 35 days
repair within 30 days
not applicable, repair whenever possible
In order to determine a chillers normal charge for leak rate calculations the best method would be to:
estimate 20lb per ton
estimate 36 lb.per ton
use the charge stated on the equipment nameplate
base charge on manifold pressure readings
Under Standard 34 R-123 falls under group _________.
Select one:
A1
A2
B1
B2
A technician servicing low- pressure appliances must be certified under
Type III cert. Of section 608
Type II cert. Of section 608
Type I Of section 608
All of the above
When recharging a low-pressure system, you should allow enough ____________ to enter the system until the refrigerant saturation temperature increases to _______degrees before introducing liquid refrigerant.
vapor / 32
vapor / 36
liquid / 32
liquid / 36
During a chiller refrigerant recovery process, you should:
circulate water through the chiller to prevent water from freezing
circulate oil through the chiller to prevent water from freezing
circulate glycol to prevent the chiller water from freezing
either a or b
Under EPA regulations, the replacement of a _______________would always be considered a major repair.
filter
drier
piston
evaporator
The leak rate threshold for comfort cooling appliances with a full charge of 50 pounds or more of HCFC refrigerant is _________%.
30
20
25
10
_________refrigerant will be contained in oil at a higher temperature.
More
Less
Same amount regardless of temp.
Either b or c
In an average 350 ton R-11 chiller, at 0 psig, once all the R-11 liquid refrigerant has been removed, the system still contains about _______lbs. of refrigerant vapor.
0
12
100
76
ASHRAE standard _____________requires that each machinery room activate an alarm and mechanical ventilation system when the TLV-TWA is exceeded.
15-2008
15-2013
18-2012
15-2015
In low pressure chillers, the most frequent route of moisture entry is:
air leak from gasketed areas or fittings
around compressor sweat fittings
above the condenser inlet
either a or b
HCFC R-123 is a ______class refrigerant.
A1
A2
B2
B1
A typical advantage of using a water cooled recovery unit will be ____________recovery of large quantities of refrigerant.
slower
faster
quieter
none of the above
According to the EPA, when you are charging a refrigeration system with R-12, you need ______-inches of mercury vacuum in the shell before charging with liquid refrigerant.
29"
12"
20"
15.2"
Removal of refrigerant oil at high temperatures (_____F) will result in less refrigerant being contained in the oil.
110
115
120
130
After evacuating a system for a repair, wait at several minutes to see if pressures rise...a rise in pressure would indicate:
moisture in the system
refrigerant in the liquid form in the system
refrigerant in the oil
either b or c
Excessive running of a purge system on a low pressure chiller generally indicate that the refrigeration system is:
running normally
overcharged
leaking
none of the above
On a centrifugal system chiller, the rupture disc connects to the:
condenser
evaporator
compressor
metering device
