TYPE 1.9

Question 1

Which hydrocarbon refrigerant is approved for retrofit into existing household refrigerators?
A. HC R-600a 2 ounces or less
B. Blended HC R-441A
e. HC R-290 lb. or less
D. Hydrocarbons are not approved for retrofit applications

Answer 1

D. Hydrocarbons are not approved for retrofit applications

Question 2

Equipment which is used to recover CFC,HCFC,and HFC refrigerant from small appliances for the purpose
of disposal must meet what standard?
A. Recover 95% or the refrigerant whether or not the compressor is operative.
B. Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an
operative compressor.
e. Recover 90% of the refrigerant with an inoperative compressor and 80% of the refrigerant with an
operative compressor.
D. Recover 75% of the refrigerant within 5 minutes.

Answer 2

B. Recover 80% of the refrigerant with an inoperative compressor and 90% of the refrigerant with an
operative compressor.

Question 3

Which of the following best describes low loss fittings, on refrigerant recovery devices used to recover
CFCs,HCFCs,and HFCs?
A. They can be either manually closed or automatically closed when disconnected to prevent loss of
refrigerant from hoses.
B. They are used to connect the recovery device to an appliance and leak only small amounts of
refrigerant during use.
e. They are used to connect the recovery device to an appliance and must be discarded after each use.
D. They eliminate oil loss during recovery

Answer 3

A. They can be either manually closed or automatically closed when disconnected to prevent loss of
refrigerant from hoses.

Question 4

What type of certification is required for persons recovering CFCs,HCFCs,or HFCs during maintenance,
service, or repair of small appliances?
A. Type II Technician
B. Type III Technician
e. Type I Technician or Universal Technician
D. Technician who has passed the core exam

Answer 4

e. Type I Technician or Universal Technician

Question 5

For which of the following refrigeration systems/appliances would it be permissible to use a passive
recovery device for recovery of CFCs, HCFCs,and HFCs?
A. A centrifugal air conditioner
B. A reciprocating liquid chiller
e. A single compressor, large commercial walk-in freezer
D. A domestic refrigerator

Answer 5

D. A domestic refrigerator

Question 6

What is the maximum normal charge of HCFC or HFC refrigerant in an appliance that is allowed to use
system dependent recovery equipment? ~
A. 5 pounds
B. 10 pounds
e. 15 pounds
D. 50 pounds

Answer 6

A. 5 pounds

Question 7

What is the maximum allowable factory charge of refrigerant for Type I appliances using CFCs,HCFCs,or
HFCs?
A. 3 pounds
B. 5 pounds
C. 10 pounds
D. 15 pounds

Answer 7

B. 5 pounds

Question 8

Any person who opens an appliance containing a CFC,HCFC,or HFC for maintenance, service or repair
must have at least one self-contained recovery machine available for use. The exception to this rule are
persons working on:
A. small appliances.
B. low-pressure appliances.
C. high-pressure appliances.
D. very high-pressure appliances.

Answer 8

A. small appliances.

Question 9

New household refrigerators may be factory charged with any of the following refrigerants, EXCEPT;
A. R-290
B. R-450A
C. R-600a
D. R-404A

Answer 9

B. R-450A

Question 10

Which of the following refrigerants is very high pressure and generally does NOT need to be recovered?
A. R-22
B. R-134a
C. R-404A
D. R-744

Answer 10

D. R-744

Question 11

What is the approximate pressure of a storage cylinder of recovered R-404A that does not contain any
non-condensable impurities and is stored in a room where the temperature is 80°F?
A. 68 psig
B. 72 psig
C. 174psig
D. 288 psig

Answer 11

D. 288 psig

Question 12

Which condition can cause excessive pressure on the high side of a self-contained (active) recovery
device?
A. When the thermal expansion valve is stuck open.
B. When the capacity of the recovery tank is larger than the charge size of the system.
C. When there is a large volume of non-condensable gas in the refrigerant being recovered.
D. When the system is set for no subcooling.

Answer 12

C. When there is a large volume of non-condensable gas in the refrigerant being recovered

Question 13

Which of the following is an acceptable method or device presently used for monitoring the 80% fill level
t1
in a recovery tank?
A. Superheat when a capillary tube is present or sub-cooling when a thermostatic expansion valve is
used.
B. Refrigerant scale or tank internal float device.
C. Refrigerant temperature measurement.
D. Refrigerant pressure measurement.

Answer 13

B. Refrigerant scale or tank internal float device.

Question 14

After installing and opening a piercing access valve, the recovery procedure cannot begin ifthe system is
at what pressure?
A. 75 psig
B. 50 psig
C. 30 psig
D. 0 psig

Answer 14

D. 0 psig

Question 15

Which of the following is a true statement regarding a refrigerant that can be used as a direct service
‘drop-in’ substitute for R-22?
A. R-134a used with a TEV
B. R-41OA used with a TEV that has a MOP of 75psig.
C. R-290 with a fixed orifice metering device.
D. There is no such thing as a “drop-in” substitute.

Answer 15

D. There is no such thing as a “drop-in” substitute.

Question 16

Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to;
A. allow the appliance to stabilize at room temperature.
B. know the type of refrigerant that is in the system.
C. remove the appliance to an outdoor location.
D. disconnect the appliance from its power source

Answer 16

B. know the type of refrigerant that is in the system

Question 17

Which condition requires accessing both the high and low side of the system for refrigerant recovery
when using the system-dependent (passive) recovery process?
A. When there is a leak in the system.
B. When the compressor operates normally.
C. When the compressor only runs at half speed.
D. When the compressor does not run.

Answer 17

D. When the compressor does not run

Question 18

Which recovery equipment maintenance practice should be performed on a regular basis?
A. Check vacuum pump for any leaks.
B. Check recovery device for refrigerant leaks.
C. Check amperage draw of recovery device.
D. Check amperage draw of vacuum pump.

Answer 18

B. Check recovery device for refrigerant leaks.

Question 19

When a pungent odor is detected during a sealed system recovery and/or repair which of the following is
most likely?
A. The refrigerant should not be recovered.
B. A compressor burnout has occurred.
C. It is the characteristic smell of the refrigerant.
D. The refrigerant should be vented.

Answer 19

B. A compressor burnout has occurred.

Question 20

After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out of
the system, the nitrogen;
A. must be recovered. €:
B. may be vented to the ambient air.
C. should be returned to the cylinder.
D. should only be used if mixed with R-22

Answer 20

B. may be vented to the ambient air

Question 21

Which refrigerants can be mixed in an appliance?
A. R-22 and R-407C
B. R-12 and R-134a
C. R-407C and R-410A
D. Refrigerants cannot be mixed

Answer 21

D. Refrigerants cannot be mixed

Question 22

What acids can CFC and HCFC refrigerants decompose into at high temperatures (e.g. open flames,
glowing metal surfaces, etc.)?
A. Boric and chromic acids
B. Sulfuric and phosphoric acids
C. Hydrochloric and hydrofluoric acids
D. Phosphoric and dodecylbenzenesulfonic acid

Answer 22

C. Hydrochloric and hydrofluoric acids

Question 23

What gases can CFC and HCFC refrigerants decompose into at high temperatures, (e.g., open flames,
glowing metal surfaces, etc.)?
A. Hydrazine gas
B. Phosgene gas
C. Helium gas
D. Tetraethyl gas

Answer 23

B. Phosgene gas

Question 24

A very large refrigerant leak can cause suffocation because refrigerants;
A. smell strong and make breathing difficult.
B. are lighter than air and cause dizziness.
C. are heavier than air and displace oxygen.
D. sting the nose and cause sneezing.

Answer 24

C. are heavier than air and displace oxygen

Question 25

Permanent safety markings are NOT required on which of the following areas on household refrigerators
using HC refrigerants?
A. On or near any evaporators and near any exposed refrigerant tubing.
B. Near the machine compartment.
C. On the inside ofthe refrigerator door.
D. On the exterior of the refrigerator.

Answer 25

C. On the inside of the refrigerator door.