Topics: ASHRAE/CMR
1: What type of copper is not permitted on refrigeration systems?
- Type M
- Type N
- Type L
- Type K
2: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- magnesium
- black iron
3: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
4: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
5: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 110
- 330
- 6.6
6: How many different groups of refrigerants are there?
- 3
- 7
- 11
- 15
7: A Low-Probability System
- 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 can not enter the occupied space
- 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 will enter the occupied space
8: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
9: Single compound Refrigerants are classified by what two criteria?
- Flammability and toxicity
- Flammability and temperature range
- Weight and color
- Temperature range and hazardousness
10: When should a relief valve start to function?
- 10 psi before it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- At it's set pressure
11: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 250
- 400
- 350
12: R-11 belongs to Group
- B-3
- B-1
- A-2
- A-1
13: A relief valve shall be located at least ___ above grade.
- 10'
- 15'
- 25'
- 36'
14: Can ammonia be used on domestic system?
- no
- yes
- yes, for systems under 10 tons
- no, unless there is proper ventilation system installed
15: 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
16: 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)
- institutional occupancy
- commercial occupancy
- illegal occupancy
- public assembly occupancy
17: Ammonia is under what safety classification?
- B3
- A3
- B2
- B1
18: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 3.0
- 2.0
- 2.5
19: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 600F
- 700F
- 800F
- 1000F
20: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or less
- 3 cubic feet or more
- 15 square feet or less
21: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 15
- 10
- 24
22: A restaurant is classified as a
- commercial occupancy
- public assembly occupancy
- large mercantile occupancy
- mixed occupancy
23: How many gallons of water per pound of ammonia do you need?
- 1
- 5
- 15
- 20
24: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
25: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above