Topics: ASHRAE/CMR
1: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a pressure relief device
- either a fusible plug or a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a fusible plug
2: Which occupancy can ammonia be used in?
- commercial
- industrial
- depends on the quantity of freon
- redifential
3: What type of material can't be used on the outlet of a relief valve?
- Magnesium alloy
- PVC
- Stainless steel
- Copper
4: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- Lithium bromide
- HCFC-123
- CFC-11
- ammonia
5: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
6: A declaration test is needed when the system contains more than
- 110 lbs
- 55 lbs
- 120 lbs
- 65 lbs
7: 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.
- 10
- 25
- 15
- 20
8: 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 water
- Because it's cheap
- Because it's a non-flammable refrigerant
9: What is an egress?
- A valve put on the low side of the system to prevent frosting
- An entrance or exit
- A code violation
- An escape route
10: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device installed on the high side of the system
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
- shall be inspected by the Boiler of Inspectors bi-annually
11: 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
12: What would be the classification of a prison?
- Large mercantile
- Industrial
- Institutional
- Place of assembly
13: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- quarterly
- bi-annually
- annually
- regularly
14: Can ammonia be used on domestic system?
- yes, for systems under 10 tons
- yes
- no, unless there is proper ventilation system installed
- no
15: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 48
- 18
- 36
- 24
16: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- A-2
- B-2
- B-1
17: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 1
- 5
- 3
- 2
18: Relief valves are rated in
- gallons of water per minute
- gallons of water per hour
- pounds of air per hour
- pounds of air per minute
19: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
20: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UM
- UL and UR
- UV or UR
- UM or UL
21: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Certified
- Coated
- Encased
22: Pipe identification labels are required when the system contains more than
- 55 lbs
- 120 lbs
- 110 lbs
- 65 lbs
23: What would be the classification of a church?
- Institutional
- Place of assembly
- Large mercantile
- Industrial
24: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
25: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- gas masks must be worn
- the owner shall be informed
- explosion precautions must be taken
- no flames shall be permitted