RE: 608 Epa tech- test prep material

EPA 608

This begins the CORE section. Questions in this section apply to all areas of the industry. You must pass the CORE and at least one other section to receive certification.

1.

Which refrigerants contain the most chlorine?a.HCFCs c.CFCsb.HFCs d.Ammonia

2.

As of what date did it become unlawful to intentionally release Class I and Class II refrigerants into the atmosphere?a.July 1, 1992 c.November 14, 1994b.July 1, 1986 d.January 1, 1996

3.

Which refrigerants have the lowest ozone depletion potential? (ODP)?a.CFCs c.HFCsb.HCFs d.Ternary blends of HCFCs

4.

The molecule found in CFC and HCFC refrigerants that destroys ozone in the atmosphere is:a.flourine c.hydrogenb.carbon d.

chlorine

5.

Stratospheric ozone consists ofa.one oxygen atom c.three oxygen atomsb.two oxygen atoms d.four oxygen atoms

6.

stratospheric ozone depletion is a ______ problem.a.American c.localb.global d.United Nations

7.

the gas in the stratosphere that protects the earth from ultraviolet radiation is:a.radon c.ozoneb.sulfur dioxide d.carbon dioxide

8.

Which refrigerant is a CFC?a.R-134a c.R-22b.R-123 d.R-12

9.

Which refrigerant is a HCFC?a.R-134a

c.R-22b.R-123 d.R-12

10.

Which refrigerant is an HFC?a.R-134a c.R-22b.R-123 d.R-12

11.

Which refrigerant contains no chlorine?a.R-134a c.R-22b.R-123 d.R-12

12.

The molecule found in the stratosphere that indicates that ozone depletion is taking place is:a.carbon monoxide c.chlorine monoxideb.carbon dioxide d.radon

13.

Which of the following would violate the Clean Air Act (CAA)?a.knowingly releasing Class I or Class II substances c.

failing to reach required evacuation levels before opening a system a system for serviceb.failing to keep or falsifying records d.all of the above

14.

One time (disposable) refigerant cylinders are used for:a.sending refrigerant for reclaim c.recycling refrigerantb.containing recovered refrigerant d.virgin refrigerant

15.

The maximum safe fill level of a refrigerant cylinder is ____% liquid.a.60 c.80b.70 d.90

16.

The time it takes to properly evacuate and dehydratea refrigeration system is determined by:a.the total volume of the system c.the ambient temperatureb.the amount of non-condensables in the system d.all of the above

17.

A system that fails to hold a vacuum after the evacuation process:a.has a restriction c.may have a leakb.may contain moisture

d.B & C

18.

To RECOVER refrigerant is to:a.remove the refrigerant from a system in any condition and store it in an external container without necessarily processing or testing c.reprocess to new refrigerant standardsb.reduce contaminants through oil separation and filtering d.remove refrigerant and change ownership

19.

The process that reduces contaminants in used refrigerant by oil separation and single or multiple passes through devices such as replaceable filter core driers which reduce moisture, acidity and particulate matter is called:a.restore c.recycleb.recovery d.reclaim

20.

The synthetic lubricant used with HCFC based ternary blends isa.alkyl-benzene c.mineralb.PAG d.ester

21.

HFC-134a is a drop-in replacement for:a.R-12 c.R-11b.R-22 d.HFC-134a is not a drop-in refrigerant

22.

The state and condition of the refrigerant entering the condenser is a :a.subcooled liquid c.superheated vaporb.subcooled vapor d.superheated liquid

23.

The state and condition of the refrigerant leaving the condenser is a :a.subcooled liquid c.superheated vaporb.subcooled vapor d.superheated liquid

24.

The componant of a refrigeration system that changes a low pressure vapor into a high presssure vapor is the:a.condenser c.evaporatorb.metering device d.compressor

25.

Rfefrigerant cylinders should be shipped:a.upside down c.parallel with the truck axelb.in the vertical, upright position d.in the original carton

This Section begins “TYPE I - SMALL APPLIANCES” as defined by the Environmental

Protection Agency.

26.

Which best describes the definition of Type I “Small Appliance” as defined by the EPA?a.Systems manufactured, charged and hermetically sealed with five pounds or less of refrigerant c.any appliance with more than 5 pounds of refrigerantb.refrigerators, freezers, room air conditioners and central airconditioners d.any appliance charged with less than two pounds of refrigerant

27.

For service and repair and maintenance of small appliances, recovery equipment manufactured after _____ must be certified by an EPA approved organization.a.July 1, 1992 c.January, 1, 1995b.August 12, 1992 d.November 14, 1993

28.

For small appliance use, the recovery unitmanufactured after November 15, 1993, must be capable of recovering:a.80% of the refrigerant when the compressor is not operating c.80% of the refrigerant when the compressor is operating or acheive a 4” vacuum under ARI-1993b.90% of the refrigerant when the compressor is operating or acheive a 4” vacuum under ARI 740-1993 d.A & B above

29.

The sale of Class I and Class II refrigerants is restricted to technicians certified by an EPA approved program after:a.July 1,1992 c.Aug 12, 1993b.November 15, 1993 d.

November 14, 1994

30.

The release of vapor from the top of a charging cylinder when filling should:a.be vented to the atmosphere c.not be vented and should be recoveredb.be vented if the quantity does not exceed 3 pounds d.be vented but not be inhaled

31.

Should the regulations of the Clean Air Act (CAA) change after a technician becomes certified:a.the technician must take a new exam to remain certified c.it will be the technician’s responsibility to comply with any changes in the lawb.all technicians that previously passed witha grade over 80% will be “grandfathered” d.the technician will be retested with a required passing grade of 90%

32.

Containers of HFC-134a are colored:a.green c.light blueb.white d.yellow33.

System dependant refrigerant recovery of small appliances:a.does not require an operating compressor c.recovers refrigerant into a non-presurized containerb.requires 80% of the charge to be recovered d.all of the above

34.

MIxed refrigerant sent to relaim centers:a.may be disposed of at owners expense

c.can be reused as isb.can be reclaimed and resold d.just needs to be filtered

35.

Before disposing of a small appliance containing CFC-12, it is necessary to:a.pressurize with nitrogen c.turn upside downb.recover the refrigerant d.thoroughly leak check

36.

Hydrchloric and hydroflouric acids are:a.caused from CFCs or HCFCs in the presence of moisture being exposed to high heat c.to be avoided when handling with bare handsb.damaging to the windings found in hermetic compressors d.all of the above

37.

A system has been operating with a complete restriction at the capillary tube inlet, what access is required for recovery?a.on access valve on the low side of the system c.one access valve on the high sideb.two valves, high and low side d.one access on the evaporator and one on the low side

38.

Which of the following refrigerants can be mixed?a.R-12 & R-134a c.R-22 & R-502

b.R-12 & R-11 d.None of the above

39.

CFC and HCFC refrigerants cause suffocation bcause:a.they contain acidic substances c.they are lighter than air and will riseb.they are heavier than air and displace oxygen d.the smell terrible preventing you from breathing

40.

A nitrogen tank should always be equipped with a(n):a.pressure regulator c.low loss fittingb.EPR valve d.air purger

41.

Ntrogen used for brazing purposes, holding charges, or leak checking:a.must be recovered c.may be vented to the atmosphereb.should not be used. It can saturate the system with moisture d.could be recovered passively

42.

Line tapping and piercing valves should always be removed from a system after the repairs are completed because:a.they restrict the flow of refrigerat c.the neoprene gasket will eventually fail and cause a leakb.they are costly d.

they destroy the appearance

43.

CFCs will not be manufactured in the USA after:a.2000 c.2005b.1995 d.1996

44.

The law states that leaks in small appliances:a.must be reapired c.do not have to be repaired but it is a good practice to repair whenever possible.b.be repaired if the system contains more than five (5) pounds of refrigerant d.be repaired if the leak rate exceeds two (2) pounds a year

45.

To work on small appliances after November 14, 1993, a technician must be certified as:a.Type I c.Universalb.Type II d.A or C

46.

The required service aperture usually found on small appliances is:a.the three-way service valve c.the schrader valveb.the process stub d.the door handle

47.

Package terminal heat pumps with less than five (5) pounds of refrigerant must be serviced by technicians with a _____ certification.a.Type I c.Type IIIb.Type II d.Type II or III

48.

Which refrigerants have a “0” ODP?a.CFCs c.HFCsb.HCFCs d.All of the above

49.

Disposable refrigerant cylinders should be disposed of by:a.rendering useless and sent to salvage c.using for a recovery cylinderb.taking to aservice station and using for an air tank d.refill with other refrigerants

50.

Which refigerant is most commonly used today as a replacement for R-12 in newly manufatured small appliances?a.r-22 c.r-134ab.r-502 d.r-123

This Section Begins Type II “High & Very High Pressure Appliances”

51.

Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen?a.R-12 c.R-22b.R-11 d.R-115

52.

Traces of oil around the sight glass inlet fitting of a refrigeration system might be an indication of:a.a leak c.an overchargeb.excessive oil in the system d.a restriction at the TXV

53.

A condition of excessive superheat at the evaporator outlet and compressor inlet of an air conditioning system could be an indication of:a.high head pressure c.insufficient waterb.a dirty condenser d.low refrigerant charge

54.

Type II classification, as identified by the EPA, applies to what equipment?a.small appliances with five (5) pounds or less refrigerant c.low pressure chillersb.refrigerators, freezers, vending machines d.split air conditioning systems with more than five (5) pounds of refrigerant charge

55.

Front seating the suction service valve will close thea.Suction inlet to the valve c.

gauge port and suction inletb.gauge port d.valve port to compressor

56.

The required level of evauation for recovery equipment manufactured before November 15, 1993 0n a system with an R-22 charge of less than 200 pounds is:a.0” Hg c.10” Hgb.4” Hg d.25 “ Hg

57.

The required level of evauation for recovery equipment manufactured after November 15, 1993 0n a system with an R-22 charge of less than 200 pounds is:a.0” Hg c.10” Hgb.4” Hg d.25 “ Hg

58.

The required level of evauation for recovery equipment manufactured after November 15, 1993 0n a system with an R-12 charge of less than 200 pounds is:a.0” Hg c.10” Hgb.4” Hg d.25 “ Hg

59.

Industrial process and commercial refrigeration equipment with an annual leak rate of ____% requires repair under EPA regulations.a.0 c.

35b.15 d.50

60.

Comfort cooling chillers and all other equipment with an annual leak rate of ____% requires repair under EPA regulations.a.0 c.35b.15 d.50

61.

Recovery time can be shortened by:a.recovering as much liquid as possible in the initial stages c.cooling the recovery tank in ice waterb.using short hoses d.all of the above

62.

The majority of the liquid to be recovered from a system will be found in the: condensera.receiver (when applied) c.low sideb.condenser d.evaporator

63.

It becomes the owners responsibility to maintain records of all refrigerant added to units that contain more than ____ pounds of refrigerant charge.a.15 c.35b.20

d.50

64.

A major repair is defined by the EPA as replacing the:a.condenser fan c.evaporatorb.compresssor d.B & C

65.

Exceptions to the required evacuation levels for recovery equipment that require an appliance be evacuated to only 0 PSIG apply to appliances that:a.are being salvaged c.have defective fan motorsb.are filled with water or substances that would damaged the recovery equipment d.have air cooled condensers

66.

The generally accepted rule for maximum liquid filling of a recovery cylinder isa.50% c.80%b.65% d.95%

67.

The refrigerant you would expect to find in a split system air conditioner manufactured before 1995 would be:a.R-12 c.R-22b.R-11 d.R-502

68.

System dependant recovery equipment is limited to appliances containing less than ___ pounds of refrigerant.a.15 c.50b.35 d.65

69.

The state and condition of the refrigerant entering the receiver is:a.superheated high pressure vapor c.superheated high pressure liquidb.subcooled high pressure vapor d.subcooled high pressure liquid

70.

The state and condition of the refrigerant leaving the accumulator is:a.superheated high pressure vapor c.superheated low pressure vaporb.subcooled high pressure vapor d.subcooled high pressure vapor

71.

Deep vacuums used for evacuation and deydration of refrigeration systems are measured in:a.tons c.PSIAb.PSIG d.microns

72.

Non-condensables in an air conditioning or refrigeration systyem will:

a.tend to stay near the top of the condenser c.be purged with a recovery machineb.increase high side pressure d.all of the above

73.

R-134a is a drop-in replacement for:a.R-12 c.R-11b.R-22 d.It is not a drop-in replacement

74.

One of the easiest ways to identify the type of refrigerant in a system is to:a.check the TXV c.check the safety cut-outb.check the name plate data d.smell the refrigerant

75.

At a room temperature ambient of 80°F, the pressure of a cylinder containing enough R-22 to have liquid in it will be approximately ______ PSIG:a.143 c.114b.74 d.212

This begins the Type III “Low Pressure Commercial Industrial Chillers” Section

76.

Recovery machines using water as the condesing medium would generally use:

a.cooling tower water c.condensate waterb.municipal water supply d.ice water

77.

Frost is best removed from a sight glass by:a.reversing the cycle c.spraying with alcoholb.chip the ice off d.turn the water supply off

78.

Recovery cylinders are color coded:a.yellow with gray tops c.yellow with white topsb.gray with yellow tops d.white

79.

Which refrigerant is a CFC and has been used with low pressure appliances?a.R-11 c.R-22b.R-12 d.R-500

80.

Type III certification ias classified by the EPA is for:a.small appliances c.low pressure appliancesb.

high and very high pressure appliances d.none of the above

81.

The maximum pressure that should be applied to alow pressure chiller when leak checking with contolled nitrogen is ___ PSIG.a.3 c.20b.10 d.30

82.

The short term replacement for R-11 refrigerant in chillers is:a.R-22 c.R-50b.R-123 d.Nitrogen

83.

Water tube leaks in a low pressure chiller are usually found witha.water puddles c.a hydrostatic tube test kitb.frosted coils d.leak detector

84.

The required evacuationlevel for recovering refrigerant from a low pressure appliance witha recovery machine manufactured before November 15, 1993 is:a.0 PSIG c.10” HG

b.4” HG d.25 “ HG

85.

The required evacuationlevel for recovering refrigerant from a low pressure appliance witha recovery machine manufactured after November 15, 1993 is:a.0 mm c.10 mm HGb.4mm HG d.25 mm HG

86.

A low pressure chiller generally has the rupture disk set at ___ PSIG.a.3 c.10b.8 d.15

87.

To prevent freezing of the water coils of a low pressure chiller, it is recommended tht:a.when charging, begin with vapor c.do not charge liquid until saturation temperature is above 32°Fb.circulate water through the chiller when charging d.all of the above

88.

A low pressure chiller that provides comfort cooling that has an annual leak rate of ____% of the total charge, must be repaired.a.15 c.35b.20 d.

50

89.

R-134a is classified as a ____ under ASHRAE 34 Standard Safety Group:a.A1 c.B1b.A2 d.B2

90.

R-123 is classified as a ____ under ASHRAE 34 Standard Safety Group:a.A1 c.B1b.A2 d.B2

91.

Under ASHRAE Standard 15, what refrigerant requires equipment room sensors?a.R-12 c.r-123b.R-500 d.r-134a

92.

Under ASHRAE Standard 15, what refrigerant requires equipment room oxygen deprivation sensors?a.R-12 c.R-134ab.R-500 d.all of the above

93.

Low pressure chillers require purge units because:a.they operate below atmospheric pressure c.A & Bb.they draw non-condensables through gaskets andseals d.they do not require purge units

94.

The rupture disk of a low pressure chiller is connected to thea.high side c.compressorb.low side d.purge valve

95.

The purge unit usually draws from thea.top of the condenser c.evaporatorb.suction of the compressor d.rupture disk

96.

Before a low pressure appliance is dismantled and salvageda.the refrigerant must be recovered c.reclaim the refrigerantb.file recovery forms d.vent the refrigerant

97.

Machine room safety standards have been established bya.ARI-7000 c.ASHRAE-34b.ARI-740 d.ASHRAE-15

98.

Refrigerant vapor is charged into a low pressure chiller initially to preventa.safety shut down c.quickerb.water freeze up caused by system vacuum d.never charge vapor into a chiller

99.

If excessive nitrogen pressure is exerted within a low pressure chiller, what componant would fail firsta.evaporator coil c.compressor sealsb.rupture disk d.cooling tower

100.

R-11 & R-123 refrigerants area.oxygen depleting c.are Class I and II substances as defined by the EPAb.heavier than air d.all of the above