Topics: ASHRAE/CMR
1: Setting a pressure relief device shall not exceed ___ of the design pressure
- 75%
- 90%
- 100%
- 80%
2: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-11
- Flush with R-718
- Flush with RX-11
- Flush with ammonia
3: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
4: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- rupture plug
- relief plug
- fusible plug
5: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 22 lbs
- 13.9 lbs
- 44 lbs
6: Which refrigerant replaced R-12?
- R-407A
- R-410A
- R-22
- R-134A
7: How far from the ground does a relief valve need to be?
- At least 25' above grade
- Not more than 3' above grade
- At least 20' above grade
- At least 15' above grade
8: What must be done to refrigerant pipes before being buried?
- Encased
- Certified
- Leaked checked
- Coated
9: 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
10: What is Trichlorotrifluoromethane?
- R-12
- R-113
- R-13
- R-11
11: A professional or office building would be considered what type of occupancy?
- commercial
- public assembly
- mercantile
- business
12: The Board of Boilers adopts by reference
- Montreal Protocol Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
- MSCA Code
13: 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
14: Halo-carbon refrigerants cannot be used with what material?
- Magnesium alloy
- Stainless Steel
- Copper
- Aluminum
15: A hotel is considered a _______ occupancy.
- commercial
- institutional
- residential
- mercantile
16: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection as well as a temperature protection device
- over pressure protection
17: 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
18: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Zinc
- Copper
- Magnesium
19: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
20: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 2
- 3
- 5
- 1
21: How are refrigerant blends classified?
- Based on the oil used
- Based on worst case fractionation
- Blends don't have to be classified
- Based on best case Fractionation
22: The gauge thickness required on a CO2 tank construction is
- 1/8"
- 5/16"
- 1/16"
- 3/32"
23: Name three things that must be done when changing refrigeration lubricant?
- Place sign, check for leaks, insulate
- Nothing must be done
- You can't change lubricants.
- Make sure it's compatible, notify owner, notify AHJ
24: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
25: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 24
- 18
- 15