Topics: ASHRAE/CMR
1: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
2: Ammonia (NH3) is a group III refrigerant
- True
- False
3: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
4: What is R-22?
- CCFCM
- Chlorofluoromethane
- Chlorodifluoromethane
- HFC
5: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
6: 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
7: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 cubic feet or more
- 15 square feet or less
- 3 cubic feet or more
8: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
9: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 50
- 75
- 20
- 15
10: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
11: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 18
- 50
- 22
12: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- PSIA
- PSIG
- temperature minus pounds of air per second divided by release rate squared
13: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
14: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Magnesium alloy
- Copper
- Aluminum
15: The certificate of inspection
- shall be posted and protected from dirt, water, and other elements
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
- shall be authorized by a notarized insurance company
16: What refrigerant were phased out in 2004?
- R-22
- R-134a
- R-12
- R-11
17: Halo-carbon refrigerants cannot be used with what material?
- Copper
- Magnesium alloy
- Stainless Steel
- Aluminum
18: What type of copper is not permitted on refrigeration systems?
- Type L
- Type N
- Type K
- Type M
19: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
20: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
- on a conspicuous card located near the compressor
- inside the room, immediately adjacent to each door
21: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Insulate the suction line before you take a superheat reading
- Add refrigerant
- Have it inspected
22: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- you can never change refrigerants
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
23: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 99%
- 80%
- 75%
- 90%
24: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- high pressure
- design pressure
- critical pressure
- low pressure
25: 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.
- 350
- 250
- 100
- 400