Topics: ASHRAE/CMR
1: What refrigerant were phased out in 2004?
- R-134a
- R-11
- R-22
- R-12
2: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Magnesium
- Aluminum
- Copper
3: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
4: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Have it inspected
- Insulate the suction line before you take a superheat reading
- Add refrigerant
5: Relief valves are rated in
- pounds of air per minute
- pounds of air per hour
- gallons of water per hour
- gallons of water per minute
6: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a fusible plug
7: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 100
- 10,000
- 1,000
- 100,000
8: Ammonia belongs to Group
- B-2
- A-1
- B-1
- A-2
9: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Rupture disk
- Fusible plug
- Glove valve
10: 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.
- 15
- 75
- 55
- 50
11: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
12: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- 2.5 times the design pressure
- the high side
- the low side
- the aggregate of the high side and low side
13: NH3 is
- R-718
- R-508A
- ammonia
- lithium bromide
14: Which refrigerant replaced R-12?
- R-407A
- R-410A
- R-22
- R-134A
15: Halogen refrigerants are corrosive to which type of metal?
- magnesium
- copper
- black iron
- stainless steel
16: How many different groups of refrigerants are there?
- 7
- 11
- 3
- 15
17: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 25
- 66
18: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
19: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
20: R-123 belongs to Group
- A-3
- B-3
- B-2
- B-1
21: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 20' above grade
- At least 25' above grade
- At least 15' above grade
22: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 18
- 15
- 24
23: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- leak checked
- installed through a pipe casing
- moisture barrier
24: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- refrigerant sensing
- A group sensing
- phosgene gas sening
- CO Sensing
25: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs