b) probhibits venting of cfc and hcfc refrigerants and ... · pdf file... your...

1) Blended refrigerants leak from a system;

a) at a faster rate than other refrigerants

b) at uneven rates due to different vapor pressures

c) at a slower rate than other refrigerants

d) only if the line breaks completely.

2) When servicing a small appliance for leak repair

a) it is mandatory to repair the leak within 30 days

b) it is mandatory to repair the leak only when 35% of the charge escapes within a 12 month period

c) it is not mandatory to repair the leak but do so whenever possible

d) both A and B.

3) The Clean Air Act;

a) calls for the phase out of CFC/HCFC production

b) probhibits venting of CFC and HCFC refrigerants and their substitutes

c) requires EPA to set standards for recovery of refrigerants prior to appliance disposal

d) all listed.

4) In what year did the Montreal Protocol conclude

a) 1964

b) 1978

c) 1999

d) 1990.

5) Some Type II appliances have king valves or service valves that have three positions. The backseated position is when the service (gauge) port is opened.

a) True

b) False.

6) How many fluorine atoms are in HCFC-123 refrigerant?

a) 2

b) 1

c) 3

d) 5 - 1 water oz.

7) What is the chemical name for R-410A

a) Tetrafluoroethane

b) Blend

c) Difluoromethane

d) Pentafluoroethane.

8) A hydrostatic tube test is used to determine if tubes in the evaporator or condenser are leaking.

a) True

b) False.

9) __________ it bcame illegal to vent substitutes for CFC and HCFC refrigerants

a) October, 1 1955

b) December 31, 1987

c) November 15, 1995.

10) The Department of Commerce regulates the recovery of refrigerants.

a) True

b) False.

11) On _________ it became illegal to vent CFC and HCFC refrigerants

a) November 15, 1995

b) Tuesday

c) August 30, 1986

d) July 1, 1992.

12) On an EPA approved recovery machine which refrigerant category listed cannot be recovered?

a) HC

b) HCFC

c) CFC

d) HFC.

13) When purging a system with dry nitrogen it is OK to vent it the atmosphere?

a) True

b) False.

14) HFC - 134a is a drop in replacement for R12

a) True

b) False.

15) The bubble point refers to refrigerant changing from liquid to vapor in the evaporator

a) True

b) False.

16) When charging refrigerant as a liquid you connect to the

a) low side

b) suction line

c) compressor

d) high side liquid line.

17) Effective _____________ all persons opening appliances (except for small appliances and MVAC) for maintenance, service, or repair and all persons disposing of appliances except for small appliances, must have at least one piece of certified, self-contained recovery equipment available at their place of business.

a) June 1, 1990

b) November 7, 1976

c) July 13, 1993

d) December 31, 1990.

18) Since _________ refrigerant recovery devices must be equipped with low loss fittings.


b) January 2, 1999

c) October 15, 1993.

19) ___________ The Clean Air Act calls for the phase-out of CFC/HCFC production, probhibits CFC/HCFC venting, and requires the EPA to set standards for recovery, recyclying and reclamation of refrigerants.

a) March 25, 1992

b) November 1, 1999

c) December 31, 2010

d) July 1, 1992.

20) What is the required level of recovery for a system that uses R-11 as a refrigerant with a charge of 150 lbs. using a recovery machine manufactured before November 15, 1993

a) 25" Hg

b) 0" Hg

c) 4" Hg

d) 10" Hg

e) 15" Hg.

21) The recovery requirement for an appliance that uses R-113 as a refrigerant with a charge of 225 pounds using a recovery machine manufactured after 11/15/93 must equal at least 28.9" Hg (sometimes rounded to 29" Hg) or 25 mm.

a) True

b) False.

22) What is the common element in CFC, HCFC and HFC refrigerants

a) water

b) carbon

c) chlorine

d) air.

23) In what year did the Montreal Protocol conclude

a) 1964

b) 1978

c) 1999

d) 1990.

24) All recovery and recycling machines manufactured after November 15, 1993 must be certified to meet EPA requirements.

a) True

b) False.

25) On ___________ it became illegal to vent HFC refrigerants.


b) January 1, 1992

c) March 10, 1995.


a) March 25, 1992

b) November 1, 1999


d) July 1, 1992.



b) January 2, 1999



a) June 1, 1990

b) November 7, 1976

c) July 13, 1993


29) Small appliance recovery equipment manufactured AFTER November 15, 1993 must be certified to be capable of;

a) recovering 90% of the refrigerant when the compressor is operating or achieving a 4 inch vacuum under the conditions of ARI 740

b) Recovering 80% of the refrigerant when the compressor is operating.

c) recovering 95% of the refrigerant when the compressor is operating or achieving a 10 inch vacuum under the condition of ARI 740.

d) recovering 75% of the refrigerant when the compressor is operating.



b) Tuesday

c) August 30, 1986

d) July 1, 1992.


a) October, 1 1955



Word Bank 101 PSIG

32) Effective June 14, 1993, any annualized rate of _______________ or more in commercial equipment with 50 lbs or more of a refrigerant charge must be repaired.


a) June 1, 1990

b) November 7, 1976

c) July 13, 1993







35) Stratospheric ozone may be defined as ______.

a) a harmful gas

b) similar to radon gas

c) a protective gas that shields the earth.

36) Radiation is the transfer of heat by heat rays.

a) True

b) False.

37) Radiation is the movement of heat from one place to another by fluid.

a) True

b) False.

38) The recovery requirement for an appliance that uses R-113 as a refrigerant with a charge of 225 pounds using a recovery machine manufactured after 11/15/93 must equal at least 28.9" Hg (sometimes rounded to 29" Hg) or 25 mm.

a) True

b) False.

39) Which is included in the list of good practices for conserving refrigerant?

a) fix repairs

b) tighten all system connections

c) recover-recycle refrigerant

d) all listed.

40) The refrigerant entering the compressor is _________.

a) a liquid

b) lightly superheated vapor

c) subcooled vapor

d) superheated liquid.

41) Which refrigerant has an ODP of 0?

a) CFC 12

b) HCFC 22

c) R410A.

42) R22 is considered a HCFC refrigerant

a) True

b) False.

43) R12 is considered a CFC refrigerant

a) True

b) False.

44) The type of refrigerant that is most harmful to the ozone layer is ______.

a) HFC

b) R22

c) ammonia

d) HCFC

e) CFC.

45) The ASHRAE Standard 34 classify A1 rerigerants as having the no flammability and low toxicity.

a) True

b) False.

46) Refillable refrigerant cylinders should never be filled above ____% of the containers capactity (by weight).

a) 65%

b) 50%

c) 80%

d) 95%.

47) Refillable cylinders are approved by which agency?

a) EPA

b) DOT

c) USDA.

48) It is OK to mix refrigerants in a storage container.

a) True

b) False.

49) What is the name of the process that removes refrigerant from a system and stores it without testing or processing?

a) Recycling

b) Reclaiming

c) Recovery.

50) All recovery and recycling machines manufactured after November 15, 1993 must be certified to meet EPA requirements.

a) True

b) False.

51) Appliances using CFC 11, 113 and HCFC 123 are considered ______ pressure appliances

a) high

b) low.

52) On ___________ it became illegal to vent HFC refrigerants.


b) January 1, 1992

c) March 10, 1995.

53) The effects of an increase in ozone depletion would

a) increase skin cancer

b) cataracts can more easily occur

c) reduced timber growth

d) marine life and food chain impaired

e) all but decrease damaging UV radiation

f) Decrease damaging UV radiation .

54) The ability of any chemical to deplete the ozone layer is called its Ozone Depletion Potential (ODP).

a) True

b) False.

55) What is the required level of recovery for a system that uses R-11 as a refrigerant with a charge of 150 lbs. using a recovery machine manufactured before November 15, 1993

a) 25" Hg

b) 0" Hg

c) 4" Hg

d) 10" Hg

e) 15" Hg.

56) What is the required level of recovery for a system that uses R-404A as a refrigerant with a charge of 250 lbs. using a recovery machine manufactured after November 15, 1993.

a) 2" Hg

b) 4" Hg

c) 25 mm

d) 10" Hg.


a) March 25, 1992

b) November 1, 1999


d) July 1, 1992.



b) January 2, 1999



a) June 1, 1990

b) November 7, 1976

c) July 13, 1993


60) Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be recovered/recycled?

a) Nothing, as long as the recovery machine is not full.

b) change the expansion valve on the recovery machine.

c) Change the filter and expansion valve on the recovery machine

d) Recover as much of the R-502 from the recovery unit as possible, change filter, and evacuate.

.

61) What is the maximum allowable factory charge of refrigerant for Type 1 appliance

a) 3 pounds

b) 5 pounds

c) 50 PSI

d) 10 pounds

e) 15 pounds.

62) A _______ is used to evaculate all mositure and non-condensables from the system's tubing and component passageways.

a) vacuum pump

b) recovery machine

c) storage container.

63) The low pressure hose on the manifold gauge set is blue.

a) True

b) False.

64) Ten atoms of chlorine can destroy ________ Ozone molecules

a) 10

b) 1000

c) 100,000

d) 50,000

e) 1,000,000.

65) Ozone is a form of oxygen gas whose molecule consist of __ atoms of ______ .

a) 1 Chlorine

b) 2 Hydrogen

c) 3 Oxygen.

66) The state of the refrigerant leaving the condenser is ______ pressure liquid.

a) superheated vapor

b) hot gas

c) high

d) low.

67) A good method for measuring the amount of refrigerant charged to a system is to use __________

a) long hoses

b) electronic weigh scale

c) electronic leak detector

d) short hoses.

68) When charging refrigerant as a liquid you connect to the

a) low side

b) suction line

c) compressor

d) high side liquid line.

69) The bubble point refers to refrigerant changing from liquid to vapor in the evaporator

a) True

b) False.

70) Where can you find the allowable test pressure on a system

a) The literature that came with the unit

b) dicitionary

c) dataplate on condenser or compressor

d) ask the owner.






72) Before disposing of a disposable refrigerant cylinder you should

a) recover the refrigerant

b) ensure the internal pressure is at least 0 PSI

c) make sure the cylinder is no longer usable

d) recycle the metal of the dispoable cylinder

e) all listed.

73) It is OK to mix R-12 and R-22 in a refillable cylinder because they both contain chlorine

a) True

b) False.

74) HFC - 134a uses which oil

a) Alkylbenzene

b) POE or ester based.

75) Which refrigerant does NOT belong in the ASHRAE STANDARD 34 Safety Group as an A1 refrigerant meaning low toxicity and flammability

a) CFC - 11

b) R - 500

c) HCFC - 22

d) HCFC -123.

76) HFC - 134a is a drop in replacement for R12

a) True

b) False.

77) When purging a system with dry nitrogen it is OK to vent it the atmosphere?

a) True

b) False.

78) On an EPA approved recovery machine which refrigerant category listed cannot be recovered?

a) HC

b) HCFC

c) CFC

d) HFC.

79) The EPA does not require that a leak on a Type I appliance must be repaired

a) True

b) False.

80) The B1 refrigerants are nonflammable but a high toxicity.

a) True

b) False.

81) What safety component must be used whenever dry nitrogen is used to pressurize a system?

a) manifold gauges

b) gloves

c) a pressure regulator

d) safety glasses.

82) Refillable refrigerant container should be pressure tested once every five years.

a) True

b) False.

83) What is typically indicated by a dehydrated system failling to hold a vacuum?

a) It has a leak

b) The red and blue hose are reversed

c) impurities in the system.

84) What is the standard for level of purity for a reclaimed refrigerant?

a) ARI Standard 700

b) AHRI Standard 550

c) BH Standard 60.

85) What must you do to the refrigerant in an appliance before disposing of the appliance

a) Vent

b) Recycle

c) Filter

d) Recover.



b) Tuesday

c) August 30, 1986

d) July 1, 1992.

87) The Department of Commerce regulates the recovery of refrigerants.

a) True

b) False.


a) October, 1 1955



89) The refrigerant entering the compressor is _________.

a) a liquid

b) lightly superheated vapor

c) subcooled vapor

d) superheated liquid.

90) R12 is considered a CFC refrigerant

a) True

b) False.

91) When transporting a refillable cylinders it must be tagged as per what agency's regulation

a) EPA

b) DOT

c) USDA.

92) Refillable refrigerant cylinders are color coded ______ on the bottom and yellow on the top.

a) blue

b) red

c) grey

d) black.

93) Using a P/T chart what is the temperature of HCFC - 22 with a passive pressure of 111.2 PSIG

a) 45.2 degrees

b) 25.8 degrees

c) 65 degrees

d) 35 degrees.

94) Large Type II appliances can be leak checked using dry nitrogen and a trace of HCFC - 22

a) True

b) False.

95) An annualized leak rate of 15% is the maximum for noncommercial systems with more than fifty pounds of refrigerant charge

a) True

b) False.

96) Using the Dupont refrigerant labeling standard the refrigerant HFC 134a contains 1 chlorine atom

a) True

b) False.

97) Open compressors have shaft seals which tend to leak when they wear

a) True

b) False.

98) Which is not a function of a crankcase heater

a) free refrigerant from oil in compressor sump

b) monitor superheat.

99) Noncondensables in the system can cause excessive head or discharge pressure

a) True

b) False.

100) Contaminated refrigerant can contain

a) acids

b) oils

c) mositure

d) all listed.

101) ASHRAE Standard 15 specifies the requirements and use of oxygen-deprivation sensors in equipment machine rooms

a) True

b) False.

102) The required level of evacuation for a Type II appliance with 255 lbs. of HCFC - 22 charge using a recovery machine manufactured before November 15, 1993 is _______________

103) Because Type II appliances are large systems a vacuum pump must be able to pull a vacuum of

a) 500 microns

b) 30" Hg

c) 250 Microns

d) 15" Hg.

104) Using a P/T chart the pressure of R - 410a refrigerant at 32 degrees farenheit is _______________

105) To maximize the efficiency of a low pressure chiller replace fittings and _______________.

106) Compression chiller system that uses R-123 as it refrigerant has an evaporator pressure 18.1 in Hg Vac and a condenser pressure of 8.1 PSI

a) True

b) False.

107) Effective June 14, 1993, any annualized rate of _______________ or more in commercial equipment with 50 lbs or more of a refrigerant charge must be repaired.

108) Open compressor shaft seals never leak

a) True

b) False.

109) The comprerssion cycle chiller has the same basic four components in an air conditioning unit.

a) True

b) False.

110) Chillers used for central air conditioning uses water as the secondary refrigerant. The water absorbs about 10 degrees of heat from the space being conditioned.

a) True

b) False.

111) When charging a chiller that has been evacuated you should charge first as a _______________ to prevent the unit from freezing up

112) Which is included in the list of good practices for conserving refrigerant?

a) fix repairs

b) tighten all system connections

c) recover-recycle refrigerant

d) all listed.

113) Which refrigerant has an ODP of 0?

a) CFC 12

b) HCFC 22

c) R410A.

114) What is the normal operating position for service valve or king valve?

a) front seated

b) back seated

c) mid seat or cracked.

115) R717 refrigerant has an ASHRAE Standard 34 rating of B1

a) True

b) False.

116) The maximum pressure for leak checking with dry nitrogen on a low pressure chiller unit is 10 PSI

a) True

b) False.

117) Low pressure chillers use rupture discs to relieve pressure. The typical rupture disc maximum pressure is 15 PSI

a) True

b) False.

118) There is approximately how many pounds of refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed?

a) 75 lbs

b) 0 its empty

c) 1 ton

d) 100 lbs.

119) Chilled water systems are used for larger applications for central air conditioning. The design temperature for boiling refrigerant in a coil used for for colling air is 40 degree F.

a) True

b) False.

120) Hydrochlorofluorocarbons (HCFC) refrigerants contain;

a) water, chlorine, fluorine & carbon

b) water, hydrogen, chlorine & carbon

c) hydrogen, chlorine, fluorine & carbon

d) hydrogen, chlorine, fluorine & water.

121) Which refrigerant is a chlorine-free refrigerant?

a) HFC-134a

b) CFC-12

c) HCFC-22

d) HCFC-124.


a) True

b) False.

123) The state of the refrigerant leaving the metering device is a lower pressure ______.

a) liquid (like a spray or mist)

b) vapor

c) gas

d) superheated vapor

e) subcooled liquid.

124) An appliance with a refrigerant charge of 75 lbs. of R22 is normally charged as a vapor only.

a) True

b) False.

125) The most commonly used refrigerants for Type II appliances include

a) R 22

b) R 410a

c) HCFC - 22

d) All listed.

126) Type II appliances with a refrigerant charge greater than 50 lbs. should be charged as a

a) vapor

b) gas

c) liquid.


a) June 1, 1990

b) November 7, 1976

c) July 13, 1993


128) 5 atoms of chlorine can destroy ________ Ozone molecules

a) 10

b) 1000

c) 100,000

d) 500,000

e) 1,000,000.


a) True

b) False.

130) When using recovery and recycling equipment manufactured BEFORE November 15, 1993, technicians must evacuate an appliance containing 10 lbs. of CFC-500 to the following level before disposing of the appliance.

a) 0 psig

b) 4" Hg

c) 10" Hg

d) 15" Hg.






132) Halide torch used for leak detection will change color when it senses the presence of chlorine; what color will be the flame?

a) light red to light blue

b) light blue to dark blue

c) blue to white

d) green to blue

e) blue to green.

133) What is the chemical name for R-410A

a) Tetrafluoroethane

b) Blend

c) Difluoromethane

d) Pentafluoroethane.

134) A recovery tank or refillable refrigerant storage container cannot exceed 80% capactity; what would be the allowable weight of the recovery tank with a tare weight of 17 pounds and a water weight of 32 pounds.

a) 35 lbs.

b) 60 lbs.

c) 627 oz

d) 500 oz.

135) How many fluorine atoms are in HCFC-123 refrigerant?

a) 2

b) 1

c) 3

d) 5 - 1 water oz.

136) Some Type II appliances have king valves or service valves that have three positions. The backseated position is when the service (gauge) port is opened.

a) True

b) False.

b) probhibits venting of cfc and hcfc refrigerants and ... · pdf file... your...

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