Topics: ASHRAE/CMR
1: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
2: 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
3: Stop valves shall not be permitted between the system and the
- relief valve
- service valve
- bleed valve
- condenser
4: _____ and its alloys are suitable for use with ammonia systems.
- Copper
- Zinc
- Magnesium
- Aluminum
5: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
6: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
7: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- 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 occupied space
8: How far from the ground does a relief valve need to be?
- At least 25' above grade
- At least 20' above grade
- Not more than 3' above grade
- At least 15' above grade
9: 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 high side
- 2.5 times the design pressure
- the aggregate of the high side and low side
- the low side
10: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- no flames shall be permitted
- the owner shall be informed
- gas masks must be worn
- explosion precautions must be taken
11: 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
12: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
13: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic and highly flammable
- toxic but non-flammable
14: R-22 is considered a(n)
- HFC
- HCFC
- HCFCH
- CFC
15: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- At least 40'
- At least 20'
- There is no minimum for relief valve and windows.
16: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 75%
- 99%
- 80%
- 90%
17: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
18: A class B2 refrigerant is considered
- non-toxic and highly flammable
- toxic and somewhat flammable
- toxic and non-flammable
- non-toxic and non-flammable
19: What pipe can not be used for refrigeration?
- M
- L
- N
- K
20: Ammonia belongs to Group
- A-1
- B-2
- B-1
- A-2
21: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 3
- 1
- 5
- 2
22: Who approves containers for refrigerants?
- E.P.A
- D.O.E
- D.O.T
- D.O.D
23: The Department that certifies the transportation of refrigerant is the
- RSES
- DOT
- EPA
- EPO
24: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 2.2
- 1.2
- 1.5
- 1
25: Relief valves are rated in
- pounds of air per hour
- pounds of air per minute
- gallons of water per hour
- gallons of water per minute