Type 1

Question 1

which hydrocarbon is approved for retrofit into existing household refri?

a) HC R-600a, 2 ounces or less
b) blended HC R-441a
c) HC R-290
d) Hydrocarbons are not approved for retrofit applications

Answer 1

d) Hydrocarbons are not approved for retrofit applications

Question 2

low loss fitting

a) they can be either manually closed or automatically closed
b) they are used to connect
c) they are used to connect
d) they eliminate oil loss during recovery

Answer 2

a) they can be either manually closed or automatically closed

Question 3

which does NOT meet Type I

a) an mvac-like system that hold 3 pounds of R-12
b) water cooler
c) food freezer
d) dehumidifier

Answer 3

a) an mvac-like system that hold 3 pounds of R-12

Question 4

maximum normal charge to use system dependent recovery equipment

a) 5 pounds
b) 10 pounds
c) 15 pounds
d) 50 pounds

Answer 4

c) 15 pounds

because it’s system dependent recovery equipment

Question 5

refrigerant in a recovery cylinder is suspected to be contaiminated

a) take a pressure reading of the cylinder
b) weight cylinder
c) discard refrigerant
d) dilute the refrigerant with virgin refrigerant

Answer 5

a) take a pressure reading of the cylinder

Question 6

when R-410a is recovered from an appliance

a) can be mixed
b) can be mixed
c) need not be recovered
d) should be recovered into a recovery vessel that is clearly marked to ensure that mixing of refrigerants doe not occur

Answer 6

d) should be recovered into a recovery vessel that is clearly marked to ensure that mixing of refrigerants doe not occu

Question 7

a standard vacuum pump designed specifically for evacuation and dehydration

a) be used alone as self-contained recovery device
b) never be used as a recovery device in combination with a pressurized container
c) be used alone as substitue for any recovery device
d) be used alone as a system-dependent

Answer 7

b) never be used as a recovery device in combination with a pressurized container

Question 8

when is it essntial to take measures to help release trapped refri from the compressore oil during refri recovery

a) when using self-contained recovery device
b) when using system-depenent acitve recovery devices
c) when using passive recovery devices on small appliance with non-operating compressors
d) when the refri system has a low side leak

Answer 8

c) when using passive recovery devices on small appliance with non-operating compressors

Question 9

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 refri being recovered
d) when the system is set for no subcooling

Answer 9

c) when there is a large volume of non-condensable gas in the refri being recovered

Question 10

monitoring 80% fill level in a recovery tank

a) superheat when a capillary tube is present
b) refri scale or tank internal float device
c) refri temperature measurement
d) refri pressure measurement

Answer 10

b) refri scale or tank internal float device

Question 11

how many access valve…..

a) 2 valves
b) only 1 access valve on the low side
c) only 1 access valve on the high side
d) 2 valves

Answer 11

c) only 1 access valve on the high side

Question 12

what should the nitrogen tank always be equipped with

a) regulator
b) float sensor
c) red top
d) hand valve

Answer 12

regulator

Question 13

refri decompose into at hight temp

a) hudrazine
b) phosgene
c) helium
d) tetraethyl

Answer 13

b) phosgene

Question 14

large leak, no breathing apparatus

a) use butyl
b) use leak detector
c) vacate and naturally ventilate the ares
d) make sure the unit

Answer 14

c) vacate and naturally ventilate the ares

Question 15

refri leak can cause suffocation

a) smell strong and make breathing difficult
b) are lighter than air
c) are heavier than air and displace oxygen
d) sting the nose

Answer 15

are heavier than air

Question 16

new household refri factory charged, EXCEPT

a) R-290
b) R-450a
c) R-600a
d) R-404a

Answer 16

b) R-450a

Question 17

a passive system-dependent recovery process for a small appliance

a) sitll use a pump to recoverrefri
b) must use a pressure relief device
c) captures refri in
d) can only perform on a system with an operating compressor

Answer 17

d) can only perform on a system with an operating compressor

Question 18

recovering refri into a non-pressurized container with an inoperative compressor

a) helpful to heat or strike the compressor with a rubber mallet
b) only necessary to recover as much
c) not necessary to recover
d) necessary to chase

Answer 18

a) helpful to heat or strike the compressor with a rubber mallet

Question 19

when installing any type of access fitting onto a sealed system

a) the fitting should be leak tested before proceeding the recovery
b) it’s not necessary to leak test an access fitting
c) the fitting need not be leak tested
d) the system must be pressure/….

Answer 19

a) the fitting should be leak tested before proceeding the recovery

Question 20

after installing and opening a piecing access valve, the recovery procedure cannot begin if the system is at what pressure?

a) 75 psig
b) 50 psig
c) 30 psig
d) 0 psig

Answer 20

d) 0 psig

Question 21

why would solderless type piercint valve not remain installed on refri system after completion of repairs

a) they are too expensive
b) they tend to leak overtime
c) they restrict refri flow
d) they tend to trap lubricant

Answer 21

b) they tend to leak overtime

Question 22

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 mixe/….

Answer 22

b) may be vented to the ambient air

Question 23

required when attaching a gauge set to check system pressures

a) release a small amount of refri to check for contamination
b) have manual or self-sealing valves on the end of the gauge set hosed to minimize any release of refri
c) recover refri and recharge to spe
d) use hoses that are 3 feet or longer

Answer 23

b) have manual or self-sealing valves on the end of the gauge set hosed to minimize any release of refri

Question 24

what must be done to the refri that is vented off the top when filling a charging cylinder

a) the refri need not be recovered
b) the refri must be recovered only if it’s CFC or HCFC
c) the refri must be recovered if it’s CFC, HCFC, HFC
d) the refri must be reclaimed or incinerated

Answer 24

c) the refri must be recovered if it’s CFC, HCFC, HFC

Question 25

why watch for signs of contamination in the oil

a) contaminants cannot be removed from the refri
b) the system will have to be flushed if contaminants are present
c) the contaminants will eat away at the recovery equipment
d) the contaminant will plug up the recovery equipment

Answer 25

a) contaminants cannot be removed from the refri

Question 26

recommended safe work practices when recovering refri

a) wear safety eyewear and butyl-lined gloves when connecting/disconnecting hoses
b) wear a respirator when working
c) wear cotton glove
d) ventilation is only necessary

Answer 26

a) wear safety eyewear and butyl-lined gloves when connecting/disconnecting hoses

Question 27

approved refri for new household

a) R-600a
b) R-1234yf
c) R-1233zd
d) R-170

Answer 27

a) R-600a

Question 28

permissible to use passive recovery device for recovery CFCs, HCFs, HFCs

a) centrifugal air conditioner
b) reciprocating liquid chiller
c) a single compressor, large commercial walk-in freezer
d) a domestic refri

Answer 28

d) a domestic refri

Question 29

which condition requires accessing both sides when using system-dependent recovery process

a) when there is a leak
b) when the compressor operates normally
c) when the compressor only runs at half speed
d) when the compressor does not run

Answer 29

d) when the compressor does not run

Question 30

stabilize to room temp before taking a pressure reading

a) to prevent safety valves from purging refri
b) it’s quick method
c) comparisons to a pressure-temp chart only valid if both the temp and stable and known
d) a temp reading alone is enough to determine refri quality

Answer 30

c) comparisons to a pressure-temp chart only valid if both the temp and stable and known

Question 31

the system dependent recovery process

a) never needs the use of a pump
b) must use a pressure relief device
c) recover refri in a non-pressurzied
d) can only be performed on a system with an operating compressor

Answer 31

d) can only be performed on a system with an operating compressor