Topics: ASHRAE/CMR
1: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or less
- 15 square feet or less
- 3 cubic feet or more
2: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Ducted and sealed
- Welded and seamed.
- Flanged and gasketed
3: What type of material can't be used on the outlet of a relief valve?
- PVC
- Stainless steel
- Magnesium alloy
- Copper
4: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
5: A Low-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
6: Which refrigerant class listed below is the most flammable?
- A-3
- C-3
- B-2
- A-1
7: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
8: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)
- public assembly occupancy
- illegal occupancy
- institutional occupancy
- commercial occupancy
9: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
10: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 44 lbs
- 22 lbs
- 13.9 lbs
- 6.6 lbs
11: A professional or office building would be considered what type of occupancy?
- mercantile
- commercial
- public assembly
- business
12: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Contractors only
- Any employee
- Anyone, it's a completely safe area
13: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 18
- 33
14: Can ammonia be used on domestic system?
- no, unless there is proper ventilation system installed
- no
- yes, for systems under 10 tons
- yes
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: Where must a refrigeration contractor's license number be displayed?
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
17: What is Trichlorotrifluoromethane?
- R-12
- R-11
- R-13
- R-113
18: A pressure relief should be located at least _______ from windows and doors.
- 25'
- 30'
- 15'
- 20'
19: A class B1 refrigerant is considered
- non-toxic and non-flammable
- toxic but non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
20: Which refrigerant class listed below is the most flammable?
- C3
- B2
- A2
- A3
21: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Certified
- Encased
22: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 700F
- 600F
- 1000F
23: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
24: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.25'
- 7.00'
- 9.00'
- 8'4"
25: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above