Topics: ASHRAE/CMR
1: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- high pressure
- low pressure
- design pressure
2: Pressure relief valves shall be marked with the data from
- Section IV Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
3: R-123 belongs to Group
- A-3
- B-1
- B-3
- B-2
4: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
5: A movie theater would be considered a
- public assembly occupancy
- commercial occupancy
- institutional occupancy
- mixed occupancy
6: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 8'4"
- 9.00'
- 7.00'
- 7.25'
7: 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, 2.5
- 2.5, 3.0
- 3.0, 3.5
8: 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 T machinery room
- Class B machinery room
9: The discharge relief valve is located (9.4.6)
- between the compressor and reciever
- between the compressor and oil separator
- on top of the condensor
- between the compressor and the stop valve
10: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 10,000
- 100,000
- 100
- 1,000
11: 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
12: What is R-22?
- HFC
- Chlorodifluoromethane
- CCFCM
- Chlorofluoromethane
13: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
14: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- Ceiling height
- 72"
- 7.25'
15: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
16: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Magnesium alloy
- Copper
- Aluminum
17: 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
18: Ammonia (NH3) is a group III refrigerant
- True
- False
19: How many different groups of refrigerants are there?
- 3
- 15
- 11
- 7
20: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Flanged and gasketed
- Welded and seamed.
- Insulated and cross broke
21: Class 3 refrigerants are
- toxic
- non-toxic
- highly flammable
- non-flammable
22: R-22 falls under which safety classification?
- A-1
- B-1
- A-2
- B-2
23: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 66
- 25
24: Which refrigerant class listed below is the most flammable?
- B-2
- A-3
- C-3
- A-1
25: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs