Topics: ASHRAE/CMR
1: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 10,000
- 100,000
- 100
- 1,000
2: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on worst case fractionation
- Based on best case Fractionation
- Based on the oil used
3: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
4: 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
5: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 50
- 350
- 550
6: What refrigerant doesn't have to be classifted?
- R-717
- R-711
- R-134a
- R-718
7: How far from the ground does a relief valve need to be?
- At least 20' above grade
- Not more than 3' above grade
- At least 15' above grade
- At least 25' above grade
8: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
9: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- shall use rupture discs or duel pressure relief valves
10: Large mercantile occupancy is
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
11: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class M machinery room
- Class B machinery room
- Class A machinery room
12: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 3.0
- 5.5
- 2.0
13: How many groups of refrigerants are there?
- 7
- 5
- 3
- 1
14: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
15: R-123 belongs to Group
- A-3
- B-3
- B-1
- B-2
16: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- institutional occupancy
- public assembly occupancy
- mixed occupancy
17: How many refrigerant classifications are there for toxicity?
- 5
- 2
- 1
- 3
18: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
19: R-11 belongs to Group
- B-1
- A-2
- B-3
- A-1
20: Class 3 refrigerants are
- non-flammable
- highly flammable
- non-toxic
- toxic
21: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 48
- 18
- 24
- 36
22: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
- shall use fusible plugs
23: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- pressure relief device
- zone valve
- high limit control
24: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 99%
- 75%
- 90%
25: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above