Topics: ASHRAE/CMR
1: When air is ducted through a machine room that services occupied space, What must be done?
- Ducted and sealed
- Welded and seamed.
- Flanged and gasketed
- Insulated and cross broke
2: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 550 lbs
- 55 lbs
- 330 lbs.
3: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 25
- 15
- 10
4: Doors communicating with outside from a mechanical room must be?
- Self-closing, approved, fire door
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
5: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- shall use pressure relief devices
6: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.5
- 2.2
- 1.2
7: Can ammonia be used on domestic system?
- yes, for systems under 10 tons
- no
- yes
- no, unless there is proper ventilation system installed
8: Joints in refrigeration piping must be _____ before being covered?
- Leak tested
- Insulated
- Inspected
- Pressurized
9: 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
10: What would be the classification of a prison?
- Institutional
- Industrial
- Large mercantile
- Place of assembly
11: Indirect systems using Group II refrigerants
- shall be used in refrigeration system in excess of 1,000 lbs
- shall be used for mechanical equipment only
- shall be used in refrigeration system less than 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
12: Class 3 refrigerants are
- toxic
- non-flammable
- non-toxic
- highly flammable
13: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 550
- 100
- 350
- 50
14: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 20
- 15
- 50
- 75
15: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 66
- 50
- 25
- 22
16: 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
17: What refrigerant were phased out in 2004?
- R-11
- R-22
- R-12
- R-134a
18: 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 will 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 can not enter the occupied space
19: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
20: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
21: A High-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 will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
22: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- T&P device
- Temperature limiter device
- Relief valve
- Circuit Breaker
23: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- Inspector leaves a metal tag with a certification listed on it
- There is a temporary shut-down until a final inspection can be performed.
- Notify the AHJ to let them know that the system been inspected
24: A relief valve discharge capacity is rated in
- PSIG
- PSIA
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
25: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited