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R-410A Practice ?s

Universal R-410A Safety & Training Exam Practice ?s

QuestionAnswer
Polyolester (POE) oils stored in plastic containers will: correct answer: absorb moisture through plastic incorrect options: separate, become more alkaline, become acidic
R-407C has: correct answer: ability to fractionate incorrect options: foul odor, to be charged in vapor phase, no temperature glide
Condensing unit designed for use with R-22: correct answer: both must be replaced with model designed for use with R-410A and cannot withstand higher pressure of R-410A incorrect option: none of above
In refrigeration system, oil and refrigerant: correct answer: mix with each other incorrect options: contain alkylbenzene, do not touch each other, are not miscible
Removal of refrigerant from system can be accomplished by these two basic methods: correct answer: active and passive incorrect options: condensation and evaporation, dew point and bubble point, superheating and subcooling
Ozone depletion is caused by: correct answer: chlorine and bromine incorrect options: HFCs, R-410A refrigerant, all of above
Cylinder code for R-407C is: correct answer: medium brown (chocolate) incorrect options: light green, rose, light blue
Receiver bypass: correct answer: prevents subcooled liquid from sitting in receiver and losing its subcooling
For commercial and industrial refrigeration systems, what % annual leak rate is considered substantial leak? correct answer: 35% incorrect options: 5%, 15%, 25%
Overcharged system can cause: correct answer: high side pressure increase incorrect options: frosted suction line, low compression ratio, high side pressure decrease
Polyolester lubricants (POEs) are used extensively with: correct answer: HFCs incorrect options: CFCs, HCFCs, halons
Technicians handling liquid refrigerant should wear gloves and: correct answer: approved eye protection incorrect options: steel-toe boots, self contained breathing apparatus (SCBA), hearing protection
R-407C pressures and temperatures are similar to: correct answer: R-22 incorrect options: R-12, R-134a, R-502
Whenever possible, to avoid fractionation, charging of refrigeration system incorporating near-azeotropic blend should be done with: correct answer: liquid refrigerant incorrect options: scroll compressor, R-22, yellow and gray recovery cylinder
Liquid lines used with R-22: correct answer: may be used with R-410A if sized and cleaned properly incorrect options: may only be used with R410A in dry climates, may never be used with R-410A, may be used with R-410A without additional considerations
If R-410A is ingested: correct answer: do not induce vomiting incorrect options: immediately inject trioxide compound, drink milk, induce vomiting
Which refrigerant has ozone depletion potential of zero? correct answer: R-134a incorrect options: R-22, HCFC-22, CFC-11
Advantage of ester-based oils such as Polyolester is: correct answer: they have wax-free composition incorrect options: they have low miscibility with R-410A, they are very hygroscopic, they trap moisture
Polyalkylene Glycol (PAG) oils: correct answer: are extremely hygroscopic incorrect options: are non-toxic if inhaled, perform well in aluminum-on-steel applications, all of above
Charging R-410A system until sight glass is clear may result in: correct answer: both compressor damage and system overcharge incorrect option: proper charge
Temperature of single compound at 100% saturated vapor with no superheat is: correct answer: equal to its saturation temperature for that pressure incorrect options: greater than its saturation temperature for that pressure, less than its saturation temperature for that pressure, none of above
R-410A systems may be topped off after leak because: correct answer: it behaves like pure compound incorrect options: it has very high temperature glide, its cylinder is rose, it must be weighed in
To find correct saturation temperature for given pressure, it's best to use: correct answer: pressure/temperature chart incorrect options: dew point, compression ratio formula, gauge manifold
Temperature glide can range from: correct answer: 0.2 to 16 degrees F incorrect options: -3 to 8 degrees F, 5 to 16 degrees F, 5.6 to 20 degrees F
Liquid changes to vapor by absorbing: correct answer: latent heat incorrect options: sensible heat, superheat, moisture
Created by: hm2795
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