Topics: ASHRAE/CMR
1: How many flammability classifications are refrigerants in?
- 2
- 3
- 7
- 5
2: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- At least 40'
- There is no minimum for relief valve and windows.
- At least 30'
3: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
4: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
5: Class A refrigerants are considered
- toxic
- non-flammable
- non-toxic
- flammable
6: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-2
- B-2
- A-1
7: Name three things that must be done when changing refrigeration lubricant?
- Place sign, check for leaks, insulate
- You can't change lubricants.
- Nothing must be done
- Make sure it's compatible, notify owner, notify AHJ
8: Refrigerants shall be classified by
- maximum permissible quantities of each group
- toxicity and flammability
- color codes
- requirements for commercial, industrial, and residential occupancies
9: How many different groups of refrigerants are there?
- 3
- 15
- 11
- 7
10: 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
11: Class T machine room
- shall include closets used for setting equipment
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
12: 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
13: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Zinc
- Nickel
- Magnesium
- Copper
14: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
15: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 15
- 24
- 18
- 10
16: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
17: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Insulated and cross broke
- Welded and seamed.
- Ducted and sealed
18: What refrigerant were phased out in 2004?
- R-134a
- R-12
- R-22
- R-11
19: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Approved by the installing contractor
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
20: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 2.5
- 3.0
- 2.0
21: 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
- 10
- 15
22: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
23: When should a relief valve start to function?
- Before the purge station discharges
- Two times it's working pressure
- At it's set pressure
- 10 psi before it's set pressure
24: R-123 belongs to Group
- B-1
- B-2
- A-3
- B-3
25: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Leak tested
- Pressurized
- Insulated