Topics: ASHRAE/CMR
1: 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 welder
- licensed technician
- competent welder
- welder qualified
2: What refrigerant doesn't have to be classifted?
- R-717
- R-711
- R-718
- R-134a
3: What would be the classification of a church?
- Place of assembly
- Industrial
- Large mercantile
- Institutional
4: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 80
- 110
- 100
5: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- the same
- there is no Group B1 refrigerants
- lower
- higher
6: NH3 is
- R-718
- R-508A
- lithium bromide
- ammonia
7: A hotel is considered a _______ occupancy.
- commercial
- residential
- mercantile
- institutional
8: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 80%
- 100%
- 75%
9: How much clearance do you need around the perimeter of electrical panels?
- 36"
- 24"
- 12"
- 18"
10: What does safe access mean?
- Well-lit exit signs
- Locked doors
- A clear unobstructed path to the equipment and controls
- OSHA approved
11: Who approves containers for refrigerants?
- D.O.D
- D.O.T
- D.O.E
- E.P.A
12: 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
- first disconnect in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- breaker panel in
- load-side of the contactor in
13: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
14: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
15: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or more
- 3 cubic feet or less
- 15 square feet or less
16: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 18
- 33
17: A pressure relief should be located at least _______ from windows and doors.
- 30'
- 25'
- 20'
- 15'
18: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Inspected
- Pressurized
- Insulated
19: R-11 belongs to Group
- B-1
- B-3
- A-2
- A-1
20: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 1/16"
- 3/32"
- 1/8"
21: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
22: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 110
- 330
- 6.6
23: A relief valve shall be located at least ___ above grade.
- 36'
- 10'
- 25'
- 15'
24: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
25: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed