Topics: ASHRAE/CMR
1: How far from the ground does a relief valve need to be?
- At least 25' above grade
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
2: 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
3: Refrigerants shall be classified by
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- color codes
- toxicity and flammability
4: How many refrigerant classifications are there for toxicity?
- 2
- 3
- 5
- 1
5: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- design pressure
- high pressure
- low pressure
- critical pressure
6: When should a relief valve start to function?
- At it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- 10 psi before it's set pressure
7: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 50
- 55
- 75
- 15
8: The gauge thickness required on a CO2 tank construction is
- 1/8"
- 5/16"
- 1/16"
- 3/32"
9: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 80%
- 75%
- 90%
- 99%
10: What pipe can not be used for refrigeration?
- M
- L
- N
- K
11: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
12: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 2.2
- 1.5
- 1.2
13: 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
14: 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
15: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 10
- 25
- III
- 15
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)
- public assembly occupancy
- institutional occupancy
- illegal occupancy
- commercial occupancy
17: Ammonia (NH3) is a group III refrigerant
- True
- False
18: How are refrigerant blends classified?
- Based on the oil used
- Based on worst case fractionation
- Blends don't have to be classified
- Based on best case Fractionation
19: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
20: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and the stop valve
- between the compressor and reciever
- between the compressor and oil separator
21: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- rupture plug
- relief plug
- fusible plug
22: Ammonia is under what safety classification?
- A3
- B2
- B3
- B1
23: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's a non-flammable refrigerant
- Because it's water
- Because it's cheap
24: What is the refrigerant chlorodifluoromethane?
- R-22
- R-123
- R-12
- R-134a
25: Which refrigerant class listed below is the most flammable?
- A-3
- C-3
- B-2
- A-1