Topics: ASHRAE/CMR
1: Who is permitted to access a refrigeration machine room?
- Anyone, it's a completely safe area
- Authorized persons only
- Contractors only
- Any employee
2: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 15 cubic feet or more
- 3 cubic feet or more
- 3 cubic feet or less
3: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 22 lbs
- 6.6 lbs
- 13.9 lbs
- 44 lbs
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: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 6.6
- 110
- 330
6: When should a relief valve start to function?
- 10 psi before it's set pressure
- Before the purge station discharges
- At it's set pressure
- Two times it's working pressure
7: What must be done if refrigeration lines pass through a concrete floor?
- moisture barrier
- installed through a pipe casing
- insulated
- leak checked
8: How many flammability classifications are refrigerants in?
- 3
- 7
- 2
- 5
9: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 22
- 25
- 50
10: R-717 is
- trichloromethane
- carbon dioxide
- ammonia
- water
11: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
12: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-22
- R-12
- R-113
- R-11
13: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's cheap
- Because it's a non-flammable refrigerant
- Because it's water
- R-718 is not rated unlimited because it's a dangerous refrigerant
14: What is Trichlorotrifluoromethane?
- R-12
- R-13
- R-11
- R-113
15: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- nothing must be done
- place sign, check for leaks, insulate
- make sure it's compatible, notify owner, notify A.H.J
- you can't change refrigerants
16: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1.2
- 1.5
- 1
17: Can ammonia be used on domestic system?
- no
- yes
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
18: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- C-3
- B-2
19: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 10
- 15
- 25
- 20
20: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
21: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
22: No open flames are allowed in the machinery room unless?
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
- Approved by the installing contractor
23: What is R-22?
- Chlorofluoromethane
- CCFCM
- Chlorodifluoromethane
- HFC
24: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
25: What happens after your initial inspection of a pressure vessel?
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.