Refrigerant Safety
Refrigerant Safety
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Question 1 |
To prevent an injury when working with refrigerants, what safety precautions are necessary?
A | Always have a fire extinguisher nearby. |
B | Always have a phosgene sensor near the equipment being serviced |
C | Always use safety glasses and gloves |
D | Always use ear protection |
Question 2 |
What two types of injuries can CFC, HCFC, and HFC refrigerants cause?
A | Lung cancer and heart attacks |
B | Heart attacks and frostbite burns |
C | Carbon monoxide poising and frostbite burns |
D | Frostbite burns and suffocation |
Question 3 |
Which of the following may cause suffocation?
A | Using a torch on a refrigeration under pressure |
B | Venting refrigerant in a confined space |
C | Using a vacuum pump in a confined space |
D | Using a torch while in an enclosed walk in cooler |
Question 4 |
Which one of the following statements is true?
A | A system should be evacuated while under pressure |
B | It is safe to heat a refrigerant cylinder above 125F |
C | Refrigerant is lighter than air |
D | Air is lighter than refrigerant |
Question 5 |
What is required in equipment rooms that use systems containing large quantities of refrigerant?
A | Phosgene and refrigerant alarms and sensors |
B | Refrigerant and carbon monoxide alarms and sensors |
C | Carbon monoxide and oxygen alarms and sensors |
D | Oxygen and refrigerant alarms and sensors |
Question 6 |
When halogens are in contact with an open flame,
A | An explosion will occur |
B | Phosgene gas is produced |
C | It is noticeable from a green color |
D | It is noticeable from a purple color |
Question 7 |
What care must be taken when working around toxic fumes?
A | Open a window it possible for ventilation |
B | Hold your breath as long as possible |
C | A breathing apparatus must be used |
Question 8 |
What must always be available when working with large amounts of refrigerants in equipment rooms?
A | A self contained breathing apparatus |
B | A fire extinguisher |
C | A carbon monoxide detector |
D | A smoke detector |
Question 9 |
When leak testing systems using nitrogen the technician should
A | Not mix refrigerant with nitrogen |
B | Leak test through the high side only |
C | Always use a pressure regulator and safety relief valve at the nitrogen tank |
D | Leak test through the low side only |
Question 10 |
When using nitrogen in a system for leak detection a technician
A | Must use two separate gauges when connecting the nitrogen and trace refrigerant to the system at the same time |
B | Should add mostly refrigerant when testing a system for leaks |
C | Does not have to use a pressure regulator on the nitrogen tank |
D | Must never connect nitrogen and refrigerant at the same timed |
Question 11 |
When pressure testing a refrigeration system
A | The system must always be in operation |
B | The pressure must be at least 50 psig |
C | The pressures must not exceed system nameplate pressures |
D | The system must always be de energized |
Question 12 |
What mixture is the most explosive?
A | Air and refrigerant |
B | Air and nitrogen |
C | Nitrogen and oil |
D | Oxygen and oil |
Question 13 |
To prevent an explosion, never leak test a system using
A | CO2 |
B | Oxygen |
C | Nitrogen |
D | R-22 |
Question 14 |
When charging refrigerant into an air conditioning system, the technician should
A | Never charge in a liquid state |
B | Never charge in a vapor state |
C | Always charge by superheat method only |
D | Always charge by the manufacturer’s recommendation |
Question 15 |
To prevent an explosion, the discharge service valve on a compressor must never be
A | In the midseated position during operation |
B | In the back seated position during operation |
C | In the front seated position during operation |
D | In the backseated position during a system pumpdown |
Question 16 |
Which refrigerant lines might cause a serious burn?
A | The discharge line |
B | The suction line |
C | The liquid line |
D | The inlet line |
Question 17 |
When handling large air conditioning fin and tube coils,
A | Always use the proper safety harness |
B | Always evacuate the coil |
C | Always use hand protection and ask for assistance |
D | Always remove the coil from the package system |
Question 18 |
Acidic oil from compressors is harmful because
A | It causes skin burns |
B | It contains oil |
C | It contains oil and refrigerant |
D | It contains refrigerant properties |
Question 19 |
When testing for natural gas leaks, never use
A | A soap bubble solution |
B | An open flame |
C | Electronic leak detectors |
D | A heavy soap solution containing chlorine |
Question 20 |
To prevent danger caused by excessive pressures
A | Never overcharge an air conditioning system |
B | Never undercharge an air conditioning system |
C | Never allow an air conditioning system to operate above 200 psig |
D | Never allow an air conditioning system to operate above 150 psig |
Question 21 |
Before opening a refrigeration system to the atmosphere
A | Always purge air from the manifold gauge set |
B | Connect a vacuum pump and evacuate the system to 500 microns |
C | Remove the refrigerant until the system’s pressure is 0 psig |
D | Remove the refrigerant until the system’s pressure is 30 psig |
Question 22 |
To prevent the refrigerant from slugging the compressor,
A | Never charge vapor into the high side while under a vacuum |
B | Never charge liquid into the high side while under a vacuum |
C | Never charge vapor into the low side |
D | Never charge liquid into the low side |
Question 23 |
If refrigerant vapor is vented into the atmosphere in a confined condition, it will
A | Cause an explosive mixture |
B | Be very flammable |
C | Displace oxygen |
D | Create phosgene gas |
Question 24 |
Disposable refrigerant cylinders
A | Are rarely color coded |
B | Can be refilled with the proper equipment |
C | Can be filled up to 80% of tank capacity |
D | Should never be refilled |
Question 25 |
A rechargeable refrigerant cylinder must
A | Not be used as a storage tank |
B | Be over 45 lbs |
C | Never filled over 80% of capacity |
D | Be heated before it can be refilled with refrigerant |
Question 26 |
When charging a rechargeable cylinder, always take into account the cylinder weight known as the
A | Tare weight |
B | Tank weight |
C | Cylinder weight |
D | None of the above |
Question 27 |
Refrigerant cylinders should never be
A | Heated with warm water |
B | Heated with a torch |
C | Stored at temperatures below 30F |
D | Refilled |
Question 28 |
Any stored refrigerant cylinder must always be
A | Properly labeled and placed in an upright position |
B | Kept at temperatures below 40F to prevent expansion |
C | No more than 30 lb |
D | At least 20% full at all times |
Question 29 |
Refrigerant recovery cylinders are commonly color coded
A | As yellow |
B | As gray |
C | With gray bottom and a yellow top |
D | With a yellow bottom and a gray top |
Question 30 |
When heating a refrigerant cylinder using warm water, the temperature of the cylinder must never exceed
A | 60 F, or the rupture disc could open |
B | 90 F, or the rupture disc could open |
C | 125 F, or the rupture disc could open |
D | Cylinders must never be heated with warm water |
Question 31 |
Refrigerant cylinders must be approved by
A | GAMA |
B | AGA |
C | DOT |
D | ACCA |
Question 32 |
Which of the following are common types of pressure relief devices?
A | Fusible plug, rupture disc, and pressure relief valve |
B | Fusible plug, vacuum break, and rupture disc |
C | Thermal disc, fusible disc, and rupture plug |
D | Fusible link, vacuum plug, and pressure relief valve |
Question 33 |
Which of the following valves must never be capped?
A | The discharge service valve |
B | The suction service valve |
C | The king valve |
D | The pressure relief valve |
Question 34 |
Relief devices must
A | Be installed in series with one another |
B | Not be installed in parallel with one another |
C | Not be installed in series with one another |
D | Be inspected annually by DOT |
Question 35 |
When pressurizing a low pressure chiller, never exceed
A | 25 psig on the low side |
B | 25 psig on the high side |
C | 10 psig on the low side |
D | 10 psig on the high side |
Question 36 |
When charging a liquid chiller
A | Refrigerant liquid is commonly added to the low side of the system |
B | Refrigerant vapor is commonly added to the low side to the system |
C | Refrigerant liquid is commonly added to the high side of the system |
D | Refrigerant vapor is commonly added to the high side of the system |
Question 37 |
A fill limit device used on a recovery system
A | Shuts down the machine when a container reaches 50% full |
B | Shuts down the machine when a container reaches 80% full |
C | Shuts down the machine when a container reaches 90% full |
D | Shuts down the machine when a container reaches 100% full |
Question 38 |
According to EPA regulations, you must never
A | Recover all refrigerants |
B | Vent refrigerant to the atmosphere |
C | Reuse refrigerant |
D | Sell reclaimed refrigerant |
Question 39 |
More caution should be given when handling class II refrigerants because
A | They are more expensive |
B | They are mostly used on industrial applications |
C | They are more toxic and flammable |
D | They are heavier |
Question 40 |
Refrigerant cylinders should never be
A | Subjected to extreme ambient temperatures |
B | Labeled |
C | DOT or UL approved |
D | Properly color coded |
Question 41 |
When working with refrigerants, what is most likely to describe the flammability and the toxicity of a refrigerant?
A | The BOCA code |
B | The EPA |
C | The MSDS |
D | None of the above |
Question 42 |
What precautions must be made when storing or transporting cylinders?
A | The cylinders must be kept under 80 F |
B | The valve and hood caps must always be secured |
C | The tanks must be inspected by the local mechanical inspector |
D | None of the above |
Question 43 |
When asbestos material is used as a pipe wrapping, the technician should
A | Remove it immediately |
B | Use eye protection, then remove the wrappings |
C | Use eye, hand, and breathing apparatus protection, then remove wrappings |
D | Leave it alone and allow qualified asbestos removal technicians to handle the removal |
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