Topics: ASHRAE/CMR
1: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- the same
- higher
- lower
- there is no Group B1 refrigerants
2: Class T machine room
- shall have remote controls to stop the action of the refrigerant compressor
- has no flame producing apparatus permanently installed
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
3: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
4: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 15 square feet or less
- 3 cubic feet or less
- 3 cubic feet or more
5: R-22 is considered a(n)
- CFC
- HFC
- HCFC
- HCFCH
6: Joints in refrigeration piping must be _____ before being covered?
- Insulated
- Pressurized
- Inspected
- Leak tested
7: Refrigerants shall be classified by
- maximum permissible quantities of each group
- color codes
- toxicity and flammability
- requirements for commercial, industrial, and residential occupancies
8: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 48
- 36
- 18
9: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
10: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
11: Which refrigerant replaced R-12?
- R-134A
- R-407A
- R-410A
- R-22
12: What type of pressure relief device is used on a CO2 system?
- Glove valve
- Fusible plug
- Gate valve
- Rupture disk
13: R-22 falls under which safety classification?
- A-2
- A-1
- B-1
- B-2
14: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class A machinery room
- Class M machinery room
- Class B machinery room
- Class T machinery room
15: How many refrigerant classifications are there for toxicity?
- 2
- 3
- 1
- 5
16: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
17: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 250
- 350
- 400
18: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Aluminum
- Magnesium
- Copper
19: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
20: How are refrigerant blends classified?
- Based on worst case fractionation
- Based on best case Fractionation
- Blends don't have to be classified
- Based on the oil used
21: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
22: What would be the classification of a prison?
- Industrial
- Place of assembly
- Large mercantile
- Institutional
23: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
24: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- III
- 15
- 10
25: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above