Topics: ASHRAE/CMR
1: 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 be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
2: 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
3: 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
4: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- annually
- quarterly
- bi-annually
5: 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 aggregate of the high side and low side
- the low side
- the high side
- 2.5 times the design pressure
6: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- unoccupied spaces
- outdoors
7: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 600F
- 700F
- 800F
- 1000F
8: Relief valves are rated in
- gallons of water per minute
- pounds of air per minute
- pounds of air per hour
- gallons of water per hour
9: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class M machinery room
- Class T machinery room
- Class A machinery room
- Class B machinery room
10: What section governs pressure vessels?
- Section ASHREA 34
- Section 1 ASHREA 15 ASME fired
- Section 8 ASHREA 15 ASME unfired
- OSHA
11: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- magnesium
- black iron
12: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Flanged and gasketed
- Welded and seamed.
- Ducted and sealed
13: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- outside the machinery room
- compressor
- boiler
- evaporator
14: 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
15: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
16: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Automatic ventilation
- Self-closing doors
- Fire hose connected to the building fire protection system.
17: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- you can never change refrigerants
18: The discharge relief valve is located (9.4.6)
- between the compressor and reciever
- between the compressor and the stop valve
- on top of the condensor
- between the compressor and oil separator
19: Where a refrigeration or air conditioning system is installed,
- A field inspection shall be made before it is put into service
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
- it shall not be operated below prescribed pressuers
20: A class B2 refrigerant is considered
- non-toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- toxic and non-flammable
21: How many refrigerant classifications are there for toxicity?
- 1
- 5
- 2
- 3
22: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 99%
- 75%
- 90%
23: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
24: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 15
- 10
- 24
25: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Board of Boilers
- Person who pulled the permit
- Person in charge of the facility