Topics: ASHRAE/CMR
1: B3 refrigerants are considered
- non-toxic but flammable
- non-toxic but non-flammable
- toxic but non-flammable
- toxic and highly flammable
2: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
3: 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.
- 90
- 100
- 110
- 80
4: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
5: Pressure relief valves shall be marked with the data from
- Section XIII Division of the ASME Boiler & Pressure Code
- Section IV Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
6: High pressure controls should be set no higher than
- 90% of set point
- 10% of set point
- 25% of set point
- 80% of set point
7: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
8: Who authorizes changes to the safety codes?
- Board of Boilers
- Person who pulled the permit
- Contractor who last serviced the system.
- Person in charge of the facility
9: 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
10: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- rupture plug
- fusion plug
- relief plug
11: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 2.5
- 2.0
- 3.0
12: Refrigerants shall be classified by
- toxicity and flammability
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
- color codes
13: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or more
- 15 square feet or less
- 3 cubic feet or less
14: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Welded and seamed.
- Flanged and gasketed
- Ducted and sealed
15: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 330 lbs
- 660 lbs
- 55 lbs
16: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
17: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
18: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
19: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
20: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 25
- 66
21: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Stop valve
- Foot valve
- Muffler
- Moisture indicator
22: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
- Yes, always
23: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
24: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
25: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-134A
- R-11
- R-22