MACS 609 CERTIFICATION QUESTIONS AND CORRECT VERIFIED ANSWERS

MACS 609 CERTIFICATION QUESTIONS
AND CORRECT VERIFIED ANSWERS
TheA2useA2ofA2ultravioletA2(UV)A2orA2fluorescentA2dyesA2inA2anA2HFO-
1234yfA2systemA2is:A2-A2Ans--
ApprovedA2byA2someA2vehicleA2manufacturesA2butA2notA2byA2others

OneA2effectA2ofA2someA2refrigerantA2gasesA2inA2theA2atmosphereA2isA2thatA2they:A2-A2Ans--
ContributeA2toA2trappingA2heat

WhichA2itemA2isA2notA2mentionedA2inA2theA2SAEA2J2099A2StandardA2ofA2refrigerantA2purity
?A2-A2Ans--Sludge

WhenA2itA2hasA2beenA2determinedA2thatA2anA2A/
CA2systemA2hasA2aA2lowA2refrigerantA2charge,A2whatA2shouldA2beA2done?A2-A2Ans--
PerformA2aA2leakA2testA2procedure

WhichA2itemA2isA2notA2mentionedA2inA2theA2SAEA2J1991A2standardA2ofA2refrigerantA2purity
?A2-A2Ans--Acid

WhichA2ofA2theA2followingA2isA2unlikelyA2toA2affectA2refrigerantA2chargeA2accuracy?A2-
A2Ans--A/CA2Compressor


CFC-12A2recoveryA2equipmentA2hasA2SAEA23/8-inchA2serviceA2fittings.A2HFC-
134aA2recoveryA2equipmentA2has:A2-A2Ans--Quick-coupleA2design

WhatA2isA2theA2advantageA2ofA2usingA2refrigerantA2identificationA2equipment?A2-A2Ans--
AllowsA2theA2abilityA2toA2determineA2whatA2typeA2ofA2refrigerantA2isA2inA2system

IfA2anA2HFC-
134aA2A/
CA2systemA2stillA2hasA2pressureA2afterA2theA2firstA2refrigerantA2recoveryA2processA2isA2com
pleteA2(includingA2theA2five-
minuteA2pause),A2additionalA2recoveryA2isA2necessaryA2untilA2theA2systemA2vacuumA2level
A2remainsA2stableA2for:A2-A2Ans--2A2minutes


PaidA2techniciansA2whoA2serviceA2orA2repairA2busesA2usingA2HCFC-
22A2asA2refrigerant,A2and/orA2serviceA2orA2repairA2aircraftA2orA2ship/
boatA2cargoA2refrigerationA2equipment:A2-A2Ans--
MustA2beA2SectionA2608A2TypeA2IIA2Certified

SpecificA2safetyA2informationA2forA2managingA2incidentsA2involvingA2refrigerantsA2andA2ot
herA2chemicalsA2(inhalation,A2spills,A2fires,A2etc.)A2isA2foundA2inA2the:A2-A2Ans--
MaterialA2safetyA2dataA2sheetA2(MSDS)A2forA2theA2chemical

, ToA2whatA2doesA2GlobalA2WarmingA2PotentialA2(GWP)A2refer?A2-A2Ans--
RelativeA2abilityA2toA2produceA2globalA2warmingA2effect

WhenA2performingA2engineA2pre-
heatA2forA2refrigerantA2removal,A2theA2technicianA2shouldA2doA2ALLA2ofA2theA2followingA2E
XCEPT:A2-A2Ans--MakeA2sureA2theA2compressorA2isA2operating

PAGA2lubricant:A2-A2Ans--IsA2hygroscopicA2(absorbsA2moisture)

ElectronicA2leakA2detectorsA2certifiedA2toA2SAEA2J2791A2haveA2theA2capabilityA2ofA2identify
ingA2leakageA2ratesA2asA2lowA2as:A2-A2Ans--0.15A2ounceA2(4A2grams)A2perA2year

WhenA2usingA2anA2HFC-
134aA2refrigerantA2recoveryA2machine,A2afterA2completingA2theA2firstA2recoveryA2process,A
2howA2longA2mustA2youA2wait,A2thenA2checkA2theA2machine'sA2gaugesA2forA2aA2riseA2inA2pr
essureA2aboveA2vacuum,A2whichA2wouldA2indicateA2thatA2theA2systemA2stillA2containsA2so
meA2refrigerant?A2-A2Ans--5A2minutes

A/
CA2systemA2serviceA2equipmentA2hosesA2mustA2beA2equippedA2withA2shutoffA2valvesA2loc
atedA2withinA2_______A2fromA2theA2"vehicleA2end"A2ofA2theA2hoses.A2-A2Ans--12A2inches

ToA2whatA2doesA2OzoneA2DepletionA2PotentialA2(ODP)A2refer?A2-A2Ans--
RelativeA2abilityA2toA2destroyA2ozone

WhichA2typeA2ofA2tankA2mustA2beA2usedA2duringA2theA2transferA2ofA2refrigerant?A2-A2Ans--
TanksA2markedA2DOTA24BA

WhenA2canA2HFC-
134aA2becomeA2combustibleA2inA2aA2mobileA2airA2conditioningA2system?A2-A2Ans--
IfA2shopA2airA2isA2usedA2inA2theA2systemA2inA2anA2attemptA2toA2checkA2forA2leaksA2andA2HF
C-134aA2isA2present

Mineral-basedA2lubricantsA2areA2usedA2inA2whichA2typeA2ofA2mobileA2A/CA2system?A2-
A2Ans--CFC-12


HowA2muchA2moistureA2isA2removedA2fromA2aA2mobileA2A/
CA2systemA2duringA2aA2typicalA2evacuation?A2-A2Ans--PossiblyA2none

WhenA2recovery/
recyclingA2equipmentA2isA2usedA2toA2removeA2refrigerantA2fromA2aA2mobileA2A/
CA2system,A2howA2muchA2lubricantA2willA2beA2removedA2duringA2theA2operation?A2-A2Ans--
Generally,A2veryA2little,A2ifA2any