Topics: ASHRAE/CMR
1: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 22
- 25
- 50
2: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 110
- 330
- 6.6
- 1,000
3: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 330
- 100
- 200
4: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Add refrigerant
- Have it inspected
5: High pressure controls should be set no higher than
- 90% of set point
- 80% of set point
- 10% of set point
- 25% of set point
6: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
7: R-22 is considered a(n)
- HCFCH
- HCFC
- HFC
- CFC
8: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.00'
- 9.00'
- 8'4"
- 7.25'
9: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the outdoors
- the return air ducted system
- Machinery rooms need not be vented
- the mechanical room housing the refrigeration system
10: 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
11: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Copper
- Zinc
- Magnesium
12: Most CFC's are
- inert
- inert but toxic
- toxic
- flammable
13: Can ammonia be used on domestic system?
- yes, for systems under 10 tons
- no
- yes
- no, unless there is proper ventilation system installed
14: Class A refrigerants are considered
- flammable
- toxic
- non-toxic
- non-flammable
15: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 25
- 20
- 15
- 10
16: What would be the classification for Stop & Shop grocery store?
- Large mercantile
- Industrial
- Instituional
- Place of assembly
17: What would be the classification of a church?
- Institutional
- Industrial
- Place of assembly
- Large mercantile
18: How many refrigerant classifications are there for flammability?
- 1
- 7
- 3
- 2
19: How far from the ground does a relief valve need to be?
- At least 20' above grade
- Not more than 3' above grade
- At least 25' above grade
- At least 15' above grade
20: When should a relief valve start to function?
- Before the purge station discharges
- 10 psi before it's set pressure
- Two times it's working pressure
- At it's set pressure
21: The discharge relief valve is located (9.4.6)
- between the compressor and reciever
- on top of the condensor
- between the compressor and oil separator
- between the compressor and the stop valve
22: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 1.5
- 2.2
- 1
23: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
24: Refrigerant restricted in 2004 but used for transition for decades:
- R-22
- R-11
- R-134A
- R-123
25: 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.
- “UM” and “UV”
- “U” or “UM”
- “UV”
- “UL”