Topics: ASHRAE/CMR
1: What refrigerant is an inorganic compound?
- R-22
- Ammonia
- R-410A
- R-132A
2: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
3: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 13.9 lbs
- 6.6 lbs
- 44 lbs
- 22 lbs
4: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- Ceiling height
- 6'
- 7.25'
5: 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.
6: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
7: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
8: Class T machine room
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
9: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- A-1
- B-2
10: What refrigerant doesn't have to be classified?
- R-717
- R-422A
- R-134A
- R-718
11: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 square feet or less
- 3 cubic feet or more
- 15 cubic feet or more
12: R-22 is considered a(n)
- HFC
- HCFCH
- CFC
- HCFC
13: 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
- breaker panel in
- 24 volt secondary side of the Class 2 transformer to the thermostat
- first disconnect in
- load-side of the contactor in
14: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
15: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the outdoors
- the return air ducted system
- Machinery rooms need not be vented
16: Pipe identification labels are required when the system contains more than
- 110 lbs
- 120 lbs
- 55 lbs
- 65 lbs
17: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 600F
- 800F
- 1000F
- 700F
18: How are refrigerant blends classified?
- Based on best case Fractionation
- Based on worst case fractionation
- Based on the oil used
- Blends don't have to be classified
19: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
20: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices
21: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.0
- 3.0
- 5.5
- 2.5
22: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Nickel
- Zinc
- Magnesium
23: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
24: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or more
25: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 350
- 550
- 50