Topics: ASHRAE/CMR
1: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Self-closing doors
- Tight fitting doors
2: NH3 is
- R-718
- ammonia
- R-508A
- lithium bromide
3: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
4: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
5: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
6: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- CO Sensing
- A group sensing
- phosgene gas sening
- refrigerant sensing
7: Relief valves are rated in
- pounds of air per hour
- pounds of air per minute
- gallons of water per hour
- gallons of water per minute
8: What is the refrigerant chlorodifluoromethane?
- R-123
- R-134a
- R-22
- R-12
9: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
10: A relief valve shall be located at least ___ above grade.
- 36'
- 25'
- 15'
- 10'
11: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
12: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and the stop valve
- between the compressor and reciever
- between the compressor and oil separator
13: Which refrigerant class listed below is the most flammable?
- C3
- B2
- A2
- A3
14: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 66
- 50
- 25
15: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 18
- 33
- 22
16: What is the refrigerant dichlorodifluoromethane?
- R-22
- R-12
- R-134A
- R-123
17: Which refrigerant replaced R-12?
- R-410A
- R-134A
- R-22
- R-407A
18: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-11
- R-113
19: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
20: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
21: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- design pressure
- high pressure
- critical pressure
22: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with ammonia
- Flush with RX-11
- Flush with R-718
- Flush with R-11
23: What refrigerant doesn't have to be classified?
- R-718
- R-422A
- R-717
- R-134A
24: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- breaker panel in
- load-side of the contactor in
25: The color code of a tank of ammonia is
- silver
- light green
- white
- lavender