Topics: ASHRAE/CMR
1: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall be inspected by the Boiler of Inspectors bi-annually
- 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
- does not require a pressure-limiting device
2: When a refrigerating machinery room is used, the emergency procedures shall be posted
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
3: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall not be prohibited
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
4: Ammonia belongs to Group
- A-1
- B-1
- B-2
- A-2
5: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
6: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- bi-annually
- quarterly
- annually
7: Which occupancy can ammonia be used in?
- industrial
- depends on the quantity of freon
- commercial
- redifential
8: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
9: 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
10: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 72"
- 7.25'
- Ceiling height
11: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
12: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
13: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
14: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the high side
- the aggregate of the high side and low side
- 2.5 times the design pressure
15: How much refrigerant can be stored in a mechanical room outside of the system?
- 100
- 330
- 200
- 150
16: The gauge thickness required on a CO2 tank construction is
- 3/32"
- 1/16"
- 1/8"
- 5/16"
17: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- critical pressure
- design pressure
- low pressure
18: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- lower
- the same
- there is no Group B1 refrigerants
- higher
19: 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
20: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- C-3
- B-2
21: R-22 is considered a(n)
- HCFC
- HCFCH
- CFC
- HFC
22: A movie theater would be considered a
- institutional occupancy
- public assembly occupancy
- mixed occupancy
- commercial occupancy
23: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
24: Setting a pressure relief device shall not exceed ___ of the design pressure
- 100%
- 75%
- 80%
- 90%
25: Single compound Refrigerants are classified by what two criteria?
- Flammability and toxicity
- Weight and color
- Temperature range and hazardousness
- Flammability and temperature range