Topics: ASHRAE/CMR
1: A High-Probablity system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
2: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Copper
- Zinc
- Magnesium
3: How many gallons of water per pound of ammonia do you need?
- 15
- 20
- 1
- 5
4: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Moisture indicator
- Foot valve
- Muffler
- Stop valve
5: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 80%
- 75%
- 90%
6: 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
7: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- public assembly occupancy.
- mercantile occupancy
- business occupancy
- commercial occupancy
8: How many flammability classifications are refrigerants in?
- 3
- 5
- 7
- 2
9: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UL”
- “U” or “UM”
- “UM” and “UV”
- “UV”
10: Ammonia (NH3) is a group III refrigerant
- True
- False
11: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a pressure relief device
- a fusible plug
- either a fusible plug or a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
12: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- A-1
- B-2
13: What is not a requirement of a class T machine room?
- self-closing doors
- fire hose connection to the building fire protection system
- automatic ventilation
- tight fitting doors
14: R-22 falls under which safety classification?
- A-1
- B-1
- B-2
- A-2
15: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- 2.5 times the design pressure
- the high side
- the aggregate of the high side and low side
16: Which refrigerant replaced R-12?
- R-410A
- R-407A
- R-134A
- R-22
17: A class B1 refrigerant is considered
- non-toxic but highly flammable
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
18: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 10
- 15
- 24
19: What type of material can't be used on the outlet of a relief valve?
- Copper
- Stainless steel
- PVC
- Magnesium alloy
20: What does “ultimate strength” mean?
- Design strength of the vessel or piping in a refrigeration system
- Stress at which rupture will occur
- Highest or design pressure allowed inside a machinery room
- None of the above
21: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-123
- R-11
- R-22
22: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
23: What refrigerant doesn't have to be classified?
- R-717
- R-718
- R-134A
- R-422A
24: Which refrigerant class listed below is the most flammable?
- B2
- A2
- A3
- C3
25: What is R-290’s ASHRAE safety code?
- A2
- A3
- B1
- B2