EPA Type
.
- 1.Avoid charging a low temperature refrigeration system too quickly"
- A.
A. because the refrigerant vapor will slug the compressor
- B.
B. because the refrigerant vapor will flood the compressor
- C.
C. because the refrigerant vapor might overload the compressor
- D.
D. all of the above
- 2.How should a newly installed residential split system be check for leaks?
- A.
A. pull a vacuum
- B.
B. pressurize the system with a trace gas mixture
- C.
C. pressurize the system with HCFC-22 and an inert gas, then check for leaks
- D.
D. pressurize the system with refrierant to psig
- 3.If a system that has been shut down for some time and itcontains liquid, the liquid can usually be found in:
- A.
A. the lowest part of a system
- B.
B. the coolest part of a system
- C.
C. the evaporator
- D.
D. none of the above
- 4.A system that has a low charge as the result of a leak has:
- A.
A. a higher than normal superheat
- B.
B. a higher than normal subcooling
- C.
C. a lower than normal superheat
- D.
D. a lower than noraml subcooling
- 5.What must you do before you use a recovery unit on equipment with a different type of refrigerant?
- A.
A. nothing as long as the next refrigerant is the same type, i.e. both CFCs or HCFCs ect.
- B.
B. recovery equipment must be used only with the same type of refrigerant
- C.
C. remove all of the first refrigerant from the unit before starting the next job
- D.
D. recover any remaining refrigerant from the unit before starting the next job
- 6.In order to speed up your repair work you may:
- A.
A. isolate most of the refrigerant in the reciver or storage tank
- B.
B. not have to recover the refrigerant if only a small amount will leak out because of your speedy repair
- C.
C. not have to remove the refrigerant if the repair is very small
- D.
D. all of the above
- 7.If an air condtioning system containing pounds of refrigerant is leaking 9.5 pounds of refriergant every 12 months:
- A.
A. you must repair all leaking system
- B.
B. the leak does not have to be repaired if you have a written plan to replace the equipment within the next year
- C.
C. you only have to repair the leak if it exceeds 21 pounds each 12 months
- D.
D. you do not have to repair the leak
- 8.Why do you have to wait a few minutes befor eremoving the recovery equipment from the system after the required vacuum is reached?
- A.
A. to see if there is going to be any more refrigerant released from the oil
- B.
B. so the pressures in the hoses will equalize so they are easier to remove
- C.
C. to enable the fittings to cool so that they will not burn your fingers
- D.
D. to check for leaks
- 9.The EPA defines a "system-dependent" recovery system as:
- A.
A. one designed by a manufacturer for use with only one type of system
- B.
B. one that is permanently attatched to the system
- C.
C. one that relise on a compressor in the appliance for recovery
- D.
D. none of the above
- 10.A system can be charged with liquid:
- A.
A. through the low-side, if the system is off
- B.
B. through the high-side, if the system is in a vacuum
- C.
C. if the cylinder can be heated
- D.
D. all of the above
- 11.Starting a semi-hermetic reciprocating compressor with the discharge valve closed:
- A.
A. will strave the compressor of oil
- B.
B. will cause it to trip on low head pressure
- C.
C. can cause a hydrostatic lock and bent rod
- D.
D. may rupture the refrigerant hose
- 12.If a system is pressurized with nitrogen which of the following leak checking methods can be used?
- A.
A. soap bubbles
- B.
B. halite torch
- C.
C. A&B
- D.
D. electronic leak detector
- 13.How long do you have to repair a leaking system if the leak is above the EPA minimums?
- A.
A. 60 days
- B.
B. 24 hours
- C.
C. 25 days
- D.
D. 30 days
- 14.Which of the refrigerant should be mixed with with nitrogen to make a trace gas for detection leaks?
- A.
A. R-502
- B.
B. R-22
- C.
C. R-12
- D.
D. all of the above
- 15.Although removing liquid is faster, it does remove more:
- A.
A. system trash
- B.
B. acid
- C.
C. oil
- D.
D. all of the above
- 16.After using a recovery unit to remove the refrigerant from a burned-out hermetic compressor you should:
- A.
A. change the oil in the recovery unit compressor
- B.
B. clean the coils and metering device with R-11
- C.
C. recycle the refrigerant back into the repaired unit
- D.
D. blow out the system with compressed air
- 17.Recovered refrigerant may be:
- A.
A. destroyed
- B.
B. reused in equipment owned by the same person
- C.
C. recycled in the same equipment
- D.
D. all of the above
- 18.Liquid can be removed from a system if it:
- A.
A. is not acidic
- B.
B. has had the oil trapped seperatly
- C.
C. does not have moisture trapped in it
- D.
D. does not have to pass through the recovery unit compressor
- 19.The purpose of a double or triple evacuation is to:
- A.
A. remove acid
- B.
B. remove moisture
- C.
C. remove contaminated oil
- D.
D. all of the above
- 20.When using a recovery unit that was manufactured in January 1994 on a system containing 10 pounds of R-22 you must recover the refrigerant to:
- A.
A. 15 inches of Hg vacuum
- B.
B. 10 inches of Hg vacuum
- C.
C. 4 inches of Hg vacuum
- D.
D. 0 inches of Hg vacuum
- 21.Oil foams as the result as of:
- A.
A. moisture in the refrigerant
- B.
B. a change in temperature
- C.
C. refrigerant boiling out
- D.
D. acid in the refrigerant
- 22.When liquid and vapor refrigerant exist in the same part of a system the refrigerant is said to be:
- A.
A. under a high pressure
- B.
B. subcooled
- C.
C. saturated
- D.
D. superheated
- 23.Ideally the suction line should contain:
- A.
A. superheated vapor
- B.
B. no oil
- C.
C. very little liquid
- D.
D. subcooled refrigerant
- 24.When the pressure in a system is 14.7 psia, the compuind reffrigerant gauge should read:
- A.
A. 14.7 psig
- B.
B. 0 psig
- C.
C. 29.4 inches of Hg
- D.
D. 14.7 inches of Hg
- 25.When evacuating an open drive compression system, the vacuum should be capcle of pulling a vacuum of:
- A.
A. 0 psig
- B.
B. 4 inches of Hg vacuum
- C.
C. 29 inches of Hg vacuum
- D.
D. 15 inches of Hg vacuum
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