Topics: ASHRAE/CMR
1: What refrigerant doesn't have to be classifted?
- R-717
- R-718
- R-711
- R-134a
2: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- relief plug
- fusion plug
- rupture plug
3: When an inspection is needed, how often must it be done?
- every 18 months
- every 36 months
- annually
- every 24 months
4: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Have it inspected
5: A High-Probablity system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is a system highly likely to leak from a failed connection or component of such system
6: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
7: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-11
- Flush with RX-11
- Flush with ammonia
- Flush with R-718
8: What refrigerant doesn't have to be classified?
- R-134A
- R-422A
- R-717
- R-718
9: What is the refrigerant chlorodifluoromethane?
- R-12
- R-123
- R-134a
- R-22
10: 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
11: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Stainless steel
- Copper
12: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 330 lbs
- 500 lbs
13: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- phosgene gas sening
- refrigerant sensing
- A group sensing
- CO Sensing
14: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- commercial occupancy
- public assembly occupancy
15: Class 3 refrigerants are
- non-toxic
- highly flammable
- non-flammable
- toxic
16: 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
17: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
- shall have a pressure limiting device and a pressure relief valve installed
- shall be inspected by the Boiler of Inspectors bi-annually
18: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
19: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- high pressure
- design pressure
- low pressure
20: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
21: Can you use Ammonia in industrial applications?
- When mixed with R-718
- No, never
- Yes, always
- Yes, Under certain condidtions
22: Single compound Refrigerants are classified by what two criteria?
- Flammability and temperature range
- Weight and color
- Flammability and toxicity
- Temperature range and hazardousness
23: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When there are sprinklers above
- When it's used as part of a supply or return air system
- When there is a space 6' or more above it
24: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
25: Who authorizes changes to the safety codes?
- Person in charge of the facility
- Contractor who last serviced the system.
- Board of Boilers
- Person who pulled the permit