Topics: ASHRAE/CMR
1: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-22
- R-11
2: Most CFC's are
- inert but toxic
- toxic
- flammable
- inert
3: Indirect systems using Group II refrigerants
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system less than 1,000 lbs
- shall be used for mechanical equipment only
4: When should a relief valve start to function?
- Before the purge station discharges
- Two times it's working pressure
- 10 psi before it's set pressure
- At it's set pressure
5: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 100,000
- 100
- 10,000
- 1,000
6: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
7: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
- shall be installed per instruction of the AHJ
8: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
9: R-123 belongs to Group
- B-1
- B-2
- A-3
- B-3
10: A class B1 refrigerant is considered
- non-toxic and non-flammable
- toxic but non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
11: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
12: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
13: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
14: The certificate of inspection
- shall be posted and protected from dirt, water, and other elements
- shall be authorized by a notarized insurance company
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
15: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- low side of the system
- the liquid side of the system
- the vapor side of the system
16: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
17: What is an egress?
- An escape route
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
- A code violation
18: Setting a pressure relief device shall not exceed ___ of the design pressure
- 80%
- 75%
- 100%
- 90%
19: Ammonia belongs to Group
- B-1
- A-2
- A-1
- B-2
20: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- A-1
- B-2
21: What is Trichlorotrifluoromethane?
- R-12
- R-11
- R-113
- R-13
22: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- licensed technician
- competent welder
- welder qualified
- licensed welder
23: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 6.6, 6.6
- 2.5, 3.0
- 2.5, 2.5
- 3.0, 3.5
24: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
25: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above