問題一覧
1
Refrigerant _____ measurement is an acceptable method to monitor the 80% fill level in a recovery tank.
scale or tank internal float device
2
_____ can be used as a direct service "drop-in" substitute for R-22.
No refrigerant
3
Recovery equipment used during the maintenance, service, or repair of small appliances must be certified by a(n) _____-approved laboratory.
EPA
4
New household refrigerators may not be factory charged with ______.
R-450A
5
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
6
The EPA's definition of a "small appliance" includes _____
products that are manufactured, fully charged, and hermetically sealed in a factory
7
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
8
The maximum allowable factory charge of refrigerant for Type I appliances using system dependent recovery equipment is _____ Ib.
15
9
CFC and HCFC refrigerants can decompose into _____ acids at high temperatures.
hydrochloric and hydrofluoric
10
CFC and HCFC refrigerants can decompose into _____ gas at high temperatures.
phosgene
11
_____ is highly pressurized and generally does not need to be recovered.
R-744
12
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
13
_____ is an approved refrigerant for new household refrigerators, freezers, and combination refrigerators/freezers.
R-600a
14
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
15
Permanent safety markings are not required _____ of household refrigerators.
on the exterior
16
_____ can be mixed in an appliance.
No refrigerants
17
If refrigerant is vented off the top when filling a charging cylinder, it _____
must be recovered if it is a CFC, HCFC, or HFC
18
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
19
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
20
A(n)_____is not a Type I appliance.
MVAC-like system that holds 2.5 lb of R-12
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
_____ is/are approved for retrofit into existing household refrigerators.
No hydrocarbons
23
If refrigerant in a recovery cylinder is suspected of being contaminated , then _____
take a pressure reading of the cylinder
24
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
25
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