Topics: ASHRAE/CMR
1: What would be the classification for Stop & Shop grocery store?
- Large mercantile
- Place of assembly
- Instituional
- Industrial
2: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Have it inspected
- Document the superheat and subcooling reading
3: What refrigerant is an inorganic compound?
- Ammonia
- R-22
- R-410A
- R-132A
4: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- critical pressure
- high pressure
- design pressure
5: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 72"
- Ceiling height
- 7.25'
6: Machinery rooms must be vented to ______?
- neutralizing tank
- outdoors
- unoccupied spaces
- basement
7: How much clearance do you need around the perimeter of electrical panels?
- 36"
- 24"
- 12"
- 18"
8: Refrigerant restricted in 2004 but used for transition for decades:
- R-22
- R-123
- R-11
- R-134A
9: What is a Category "M" fluid?
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
10: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there is a space 6' or more above it
- When its white
- When it's used as part of a supply or return air system
- When there are sprinklers above
11: 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
12: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
13: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
14: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
15: Class T machine room
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
16: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or more
- 3 cubic feet or less
- 15 square feet or less
17: Can ammonia be used on domestic system?
- yes
- no
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
18: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
19: 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
- shall be inspected by the Boiler of Inspectors bi-annually
- shall have a pressure limiting device and a pressure relief valve installed
- does not require a pressure-limiting device
20: How many different groups of refrigerants are there?
- 7
- 11
- 15
- 3
21: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- 10
- 15
- III
22: Class A refrigerants are considered
- flammable
- non-toxic
- toxic
- non-flammable
23: Which refrigerant replaced R-12?
- R-407A
- R-22
- R-410A
- R-134A
24: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can never change refrigerants
- Make sure its compatible, notify owner, and notify AHJ.
- Place sign, check for leaks, and insulate suction line
- Nothing must be done
25: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Copper
- Zinc
- Magnesium