Topics: ASHRAE/CMR
1: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-12
- R-123
- R-22
2: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 75%
- 90%
- 99%
3: Trichlorofluoromethane is the name of what refrigerant?
- R-113
- R-11
- R-12
- R-502
4: 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
5: How many flammability classifications are refrigerants in?
- 3
- 7
- 2
- 5
6: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Glove valve
- Fusible plug
- Gate valve
7: What would be the classification of a church?
- Institutional
- Place of assembly
- Large mercantile
- Industrial
8: 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
9: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 110
- 80
- 90
- 100
10: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Automatic ventilation
11: What refrigerant doesn't have to be classifted?
- R-718
- R-717
- R-711
- R-134a
12: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Welded and seamed.
- Ducted and sealed
- Insulated and cross broke
13: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 24
- 15
- 18
- 10
14: Who authorizes changes to the safety codes?
- Board of Boilers
- Person who pulled the permit
- Person in charge of the facility
- Contractor who last serviced the system.
15: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- high pressure
- critical pressure
- design pressure
16: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall be inspected by the Boiler of Inspectors bi-annually
- 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
17: Setting a pressure relief device shall not exceed ___ of the design pressure
- 100%
- 80%
- 75%
- 90%
18: R-22 falls under which safety classification?
- A-2
- B-2
- B-1
- A-1
19: Where must a refrigeration contractor's license number be displayed?
- Uniforms, checks, and invoices.
- Trucks, invoices, and advertising
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
20: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's water
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
21: A class A3 refrigerant is considered
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
22: 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
23: Ammonia belongs to Group
- B-1
- A-2
- A-1
- B-2
24: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
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.
- 100
- 250
- 400
- 350