Skills and Trades

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All refrigerants with a three-digit number starting with the number 4 are: A) Refrigerant blends. ... Started by sarasara	3 Replies 60 Views	Jul 24, 2018 by Jmfn03
Zeotropic refrigerant blends condense and evaporate at: A) A single pressure. B) Multiple ... Started by audie	1 Replies 36 Views	Jul 24, 2018 by aprice35067
When looking for information on physical and chemical properties, the section to look at in a SDS is ... Started by Tazate	1 Replies 61 Views	Jul 24, 2018 by maaaaaaaaaa
Why is it necessary to purge gauge manifold valves while they are connected? A) To prevent valve ... Started by jerry coleman	1 Replies 32 Views	Jul 24, 2018 by kescobar@64
When should a technician read the SDS for a particular refrigerant? A) Before using the ... Started by pane00	3 Replies 54 Views	Jul 24, 2018 by bookworm410
How would high levels of inhalation of a refrigerant affect an individual? A) Delusions may be ... Started by abern	1 Replies 19 Views	Jul 24, 2018 by cam1229
Asphyxiation may occur from breathing in refrigerant, as it is heavier than air and will: A) ... Started by tiara099	1 Replies 15 Views	Jul 24, 2018 by pratush dev
Why is backseating a manual service valve when installing a gauge manifold necessary? A) So that ... Started by Redwolflake15	1 Replies 25 Views	Jul 24, 2018 by janeli
Skin exposed to streams of liquid refrigerant can receive: A) Cardiac arrhythmia. B) Convulsions ... Started by fahad	3 Replies 21 Views	Jul 24, 2018 by lolol
When a manual service valve is frontseated: A) Both the service port and the line are closed to ... Started by WWatsford	1 Replies 84 Views	Jul 24, 2018 by izzat
If oxygen is under pressure and mixed with refrigerant oil, which of the following will result? ... Started by cartlidgeashley	1 Replies 25 Views	Jul 24, 2018 by mmj22343
Which of the refrigerant ratings indicates that a refrigerant is considered highly flammable? A) ... Started by luvbio	1 Replies 41 Views	Jul 24, 2018 by jaygar71
When connecting gauges to an already installed and operating unit with split-system installation ... Started by lracut11	3 Replies 31 Views	Jul 24, 2018 by kilada
Why is it most important to take special precautions when working with Schrader valves? A) They ... Started by saliriagwu	1 Replies 35 Views	Jul 24, 2018 by cloud
Which type of glove should be used if prolonged contact with liquid or gas is expected? A) PVA B) ... Started by Sufayan.ah	1 Replies 64 Views	Jul 24, 2018 by Toya9913
Split-system heat pumps have a third service valve that is not connected to either refrigerant line. ... Started by oliviahorn72	1 Replies 45 Views	Jul 24, 2018 by cdmart10
What is the maximum safe fill level for a refillable refrigerant cylinder? A) 90 B) 80 C) 85 D) ... Started by bcretired	3 Replies 54 Views	Jul 24, 2018 by yifu223
Who may refill a DOT 39 nonrefillable cylinder? A) Only EPA-certified refrigerant recyclers B) ... Started by formula1	1 Replies 38 Views	Jul 24, 2018 by kmb352
What is the maximum safe storage temperature for refrigerant cylinders? A) 150F B) 175F C) 125F ... Started by Yolanda	1 Replies 36 Views	Jul 24, 2018 by kusterl
What type of units are only required to have process stubs? A) Type II only B) Type I only C) ... Started by big1devin	1 Replies 44 Views	Jul 24, 2018 by tmlewis4706
To avoid breathing in spilled materials, you should immediately use which of the following? A) ... Started by leo leo	3 Replies 112 Views	Jul 24, 2018 by amit
After servicing a system using a bolt-on piercing valve, the technician should: A) Simply remove ... Started by mia	1 Replies 73 Views	Jul 24, 2018 by marict
What PPE should technicians always wear when handling refrigerant? A) Gloves, safety glasses, and ... Started by dbose	1 Replies 57 Views	Jul 24, 2018 by izzat
What type of sensor is most often used to detect very low parts per million for toxic refrigerants? ... Started by danielfitts88	1 Replies 29 Views	Jul 24, 2018 by nhea
Which pressure relief device works primarily by temperature? A) Rupture disk B) Pressure relief ... Started by Mr. Wonderful	3 Replies 144 Views	Jul 24, 2018 by bob