Topics: ASHRAE/CMR
1: Which refrigerant class listed below is the most flammable?
- A-3
- B-2
- A-1
- C-3
2: Most CFC's are
- inert but toxic
- toxic
- flammable
- inert
3: 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
4: What is not a requirement of a class T machine room?
- self-closing doors
- fire hose connection to the building fire protection system
- automatic ventilation
- tight fitting doors
5: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
6: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
7: What type of relief valve is used on a CO2 system?
- gate valve
- rupture disc
- fusible plug
- glove disc
8: Liquid level gauges must be provided with what?
- A red line
- A low level mark
- Automatic shut-offs
- A relief valve
9: Single compound Refrigerants are classified by what two criteria?
- Flammability and toxicity
- Flammability and temperature range
- Weight and color
- Temperature range and hazardousness
10: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
11: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Stainless steel
- Copper
12: B3 refrigerants are considered
- toxic and highly flammable
- toxic but non-flammable
- non-toxic but flammable
- non-toxic but non-flammable
13: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 15
- 10
- 24
14: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
15: Ammonia is under what safety classification?
- B3
- A3
- B2
- B1
16: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
17: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
18: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
19: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-1
- B-2
- A-2
20: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- commercial occupancy
- public assembly occupancy.
- business occupancy
- mercantile occupancy
21: A relief valve discharge capacity is rated in
- PSIA
- PSIG
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
22: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
23: R-11 belongs to Group
- B-3
- B-1
- A-2
- A-1
24: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
25: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 100%
- 90%
- 80%