問題一覧
1
The EPA's definition of a "small appliance" includes _____
products that are manufactured, fully charged, and hermetically sealed in a factory
2
_____ is/are approved for retrofit into existing household refrigerators.
No hydrocarbons
3
Recovery equipment used during the maintenance, service, or repair of small appliances must be certified by a(n) _____-approved laboratory.
EPA
4
Refrigerant recovery devices must be equipped with low-loss fittings, which are fittings that are used to connect the recovery device to an appliance and that _____.
prevent loss of refrigerant from connections
5
A(n)_____is not a Type I appliance.
MVAC-like system that holds 2.5 lb of R-12
6
The maximum allowable factory charge of refrigerant for Type I appliances using system dependent recovery equipment is _____ Ib.
15
7
Any technician that opens an appliance for maintenance, service, or repair must have at least one self-contained recovery machine available at their place of business, except when recovering refrigerant passively from _____ appliances.
small
8
_____ is highly pressurized and generally does not need to be recovered.
R-744
9
If refrigerant in a recovery cylinder is suspected of being contaminated , then _____
take a pressure reading of the cylinder
10
Following the recovery of R-410A from an appliance, it _____.
should be recovered into a recovery vessel that is clearly marked to ensure that mixing of refrigerants does not occur
11
Standard vacuum pumps that are designed specifically for evacuation and dehydration can _____.
never be used as a recovery device in combination with a pressurized container
12
During refrigerant recovery, it is necessary to take measures to help release trapped CFC, HCFC, or HFC refrigerants from the compressor oil when _____.
using passive recovery devices on small appliances with non-operating compressors
13
A storage cylinder of R-404A that is stored at 80°F and does not contain any non-condensable impurities would have an approximate pressure of ____ psig.
174
14
Refrigerant _____ measurement is an acceptable method to monitor the 80% fill level in a recovery tank.
scale or tank internal float device
15
_____ can be mixed in an appliance.
No refrigerants
16
CFC and HCFC refrigerants can decompose into _____ acids at high temperatures.
hydrochloric and hydrofluoric
17
CFC and HCFC refrigerants can decompose into _____ gas at high temperatures.
phosgene
18
_____ is an approved refrigerant for new household refrigerators, freezers, and combination refrigerators/freezers.
R-600a
19
A recovery device used with small appliances containing CFCs, HCFCs, and HFCs must recover_____ % of the refrigerant when the compressor is operating or achieve a 4" vacuum.
90
20
New household refrigerators may not be factory charged with ______.
R-450A
21
_____ is required when attaching a gauge set to check the system pressure.
Having manual or self-sealing valves on the end of a gauge set hose to minimize any accidental refrigerant release
22
If refrigerant is vented off the top when filling a charging cylinder, it _____
must be recovered if it is a CFC, HCFC, or HFC
23
A technician should be attentive to signs of contamination in the oil when recovering refrigerant from a system that suffered a compressor burnout because the _____
system will have to be flushed if contaminants are present
24
Permanent safety markings are not required _____ of household refrigerators.
on the exterior
25
_____ can be used as a direct service "drop-in" substitute for R-22.
No refrigerant