Topics: ASHRAE/CMR
1: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
2: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Nickel
- Copper
- Magnesium
- Zinc
3: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
4: What is the refrigerant chlorodifluoromethane?
- R-22
- R-134a
- R-123
- R-12
5: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall be approved by the owner for proper operation.
- it shall not be operated below prescribed pressures
6: Halogen refrigerants are corrosive to which type of metal?
- copper
- black iron
- magnesium
- stainless steel
7: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
8: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UM” and “UV”
- “UL”
- “UV”
- “U” or “UM”
9: What type of relief valve is used on a CO2 system?
- glove disc
- rupture disc
- gate valve
- fusible plug
10: R-11 belongs to Group
- B-1
- A-2
- B-3
- A-1
11: 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
12: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- bi-annually
- quarterly
- annually
13: What is the minimum height refrigeration piping should be placed against walls?
- 7.25'
- 72"
- Ceiling height
- 6'
14: 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
15: 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
16: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
17: What refrigerant were phased out in 2004?
- R-12
- R-11
- R-134a
- R-22
18: What type of material can't be used on the outlet of a relief valve?
- PVC
- Copper
- Stainless steel
- Magnesium alloy
19: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 150
- 330
- 100
20: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
21: How many refrigerant classifications are there for toxicity?
- 5
- 2
- 1
- 3
22: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
23: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
24: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 90%
- 80%
- 100%
- 75%
25: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- C-3
- B-2