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I9 > CORE 9.0 > Flashcards

CORE 9.0 Flashcards

1
Q 
Which of the following gases is used as the baseline measurement for global warming potential?
A. Ammonia
B. Carbon Dioxide
C. CFC-12
D. Propane
A

B. Carbon Dioxide

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2
Q 
Which type of refrigerant typically has the lowest global warming potential?
A. HCFCs
B. HFOs
C. HFCs
D. All are equal
A

B. HFOs

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3
Q

What are the characteristics of hydrofluoroolefins (HFOs)?
A. Non-ozone depleting, and have high global warming potentials.
B. Non-ozone depleting, and have a low global warming potentials.
C. Ozone depleting, and have high global warming potentials.
D. Ozone depleting, and have low global warming potentials.

A

B. Non-ozone depleting, and have a low global warming potentials

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4
Q 
Which of the following refrigerants is an HFO?
A. R-1234yf
B. R-123
C. R-134a
D. All three are HFOs
A

A. R-1234yf

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5
Q

Why are some hydrofluoroolefin (HFO) refrigerants classified as
A. They are no different than HFCs.
B. They are less flammable than hydrocarbon refrigerants, but most are still mildly flammable.
C. They are prohibited for use in the u.s.
D. They have ozone depleting potentials, and have low global warming potentials.

A

B. They are less flammable than hydrocarbon refrigerants, but most are still mildly flammable

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6
Q 
Ozone depletion in the stratosphere is what type of problem?
A. Local
B. Regional
C. National
D. Global
A

D. Global

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7
Q 
Which type of refrigerant is the most harmful to stratospheric ozone?
A. CFCs
B. HCFCs
C. HFCs
D. HFOs
A

A. CFCs

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8
Q 
HFC refrigerants contain which of the following?
A. Chlorine, fluorine & carbon
B. Chlorine, fluorine & hydrogen
C. Hydrogen, chlorine & carbon
D. Hydrogen, fluorine & carbon
A

D. Hydrogen, fluorine & carbon

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9
Q 
Which of the following refrigerants damages stratospheric ozone?
A. HFOs
B. HFCs
C. HCFCs
D. Ammonia
A

C. HCFCs

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10
Q 
Which refrigerant can be purchased by someone who is NOT a Section 608 certified technician?
A. Carbon Dioxide refrigerant
B. Hydrofluorocarbon refrigerants
C. Hydrofluoroolefi n refrige rants
D. Hydrochlorofluorocarbon refrigerants
A

A. Carbon Dioxide refrigerant

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11
Q

Which of the following is a lawful use of HCFC-22?
A. Creating a new air conditioner using “dry-charge” components.
B. Servicing existing R-22 systems.
C. Charging any new system designed for R-407C.
D. Retrofitting any equipment.

A

B. Servicing existing R-22 systems.

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12
Q

For an appliance that uses a CFC, HCFC,or HFC refrigerant, which of the following violates the prohibition
on venting?
A. Accidental releases associated with timely repair of an appliance.
B. Refrigerants emitted when cutting a line without properly evacuating the appliance.
C. Refrigerants emitted in a catastrophic failure of an appliance.
D. Refrigerants emitted when connecting or disconnecting low loss hoses to charge or service an
appliance

A

B. Refrigerants emitted when cutting a line without properly evacuating the appliance.

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13
Q

Which of the following refrigerant releases is considered a violation of the prohibition on venting?
A. Release of “de minimis” quantities in the course of making good faith attempts to recapture and
recycle or safely dispose of refrigerant.
B. Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged
appliance to leak check the appliance.
C. Refrigerants emitted in the course of normal operation of an appliance.
D. Refrigerants emitted when connecting or disconnecting low loss hoses to charge or service an
appliance

A

B. Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged
appliance to leak check the appliance.

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14
Q

What is the Montreal Protocol? It:
A. An international treaty that addresses ozone-depleting substances and their alternatives.
B. A test for energy efficiency adopted by the Canadian government.
C. A procedure for measuring levels of CFCs in the atmosphere.
D. A test for ozone concentration

A

A. An international treaty that addresses ozone-depleting substances and their alternatives

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15
Q

Recovery equipment that relies on the compressor in the appliance and/or the pressure of the
refrigerant in the appliance would be considered:
A. System-dependent
B. Self-contained
C. A packaged terminal unit
D. Self-sufficient

A

A. System-dependent

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16
Q 
What can ester based oils be mixed with?
A. Pag oils
B. Paraffinic mineral oils
C. Alkylbenzene oils
D. No other oils
A

D. No other oils

17
Q

Which of the following is NOT a “refrigerant” as it is used in Section 608 of the Clean Air Act?
A. An ozone-depleting substance used in a household or commercial air conditioner.
B. A non-ozone depleting substance used in a refrigerator or freezer.
C. Any substitute for a Class I or Class II substance used in a chiller.
D. A leak trace gas.

A

D. A leak trace gas.

18
Q 
Manufacturers often color code the exterior of gauges. What color is the low pressure gauge on a typical
gauge manifold set?
A. Green
B. Yellow
C. Blue
D. Red
A

C. Blue

19
Q 
Which word applies to the process that returns refrigerant to new product specifications and that
requires chemical analysis?
A. Recovery
B. Recycle
C. Reprocess
D. Reclaim
A

D. Reclaim

20
Q

Which of the following is TRUE if a system WILL NOT hold a vacuum after it has been evacuated?
A. The system is ready to be charged.
B. The system has been adequately evacuated.
C. The system may be leaking.
D. An expansion valve is clogged.

A

C. The system may be leaking.

21
Q

Why should long hoses between the unit and the recovery machine be avoided?
A. They cause excessive pressure drop and increased recovery time.
B. They increase pressure and recovery time.
C. They decrease emissions and recovery time.
D. They cause excessive temperature rises, with decreasing pressures that can lead to seal failure

A

A. They cause excessive pressure drop and increased recovery time

22
Q

In what state should a system be to measure a final system vacuum?
A. With the gas ballast open.
B. With the vacuum pump operating.
C. With the system heated.
D. With the system isolated and the vacuum pump turned off.

A

D. With the system isolated and the vacuum pump turned off

23
Q 
When corrosion is found within the body of a relief valve, the valve must be:
A. Repaired
B. Reconditioned
C. Cleaned
D. Replaced
A

D. Replaced

24
Q 
A refillable refrigerant cylinder must not be filled above what percent of its capacity by weight:
A. 50%
B. 70%
C. 80%
D. 95%
A

C. 80%

25
Q 
Portable refillable tanks or containers used to ship CFC or HCFC refrigerants obtained with recovery
equipment must meet what standard(s)?
A. Department of Transportation
B. Community Right to Know Act
C. Underwriters Laboratories
D. All of the above
A

A. Department of Transportation

I9 (4 decks)

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