Topics: ASHRAE/CMR
1: Stop valves shall not be permitted between the system and the
- relief valve
- service valve
- condenser
- bleed valve
2: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- A-2
- B-2
- B-1
3: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- gas masks must be worn
- no flames shall be permitted
- explosion precautions must be taken
- the owner shall be informed
4: 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
5: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 2.5, 2.5
- 6.6, 6.6
- 3.0, 3.5
- 2.5, 3.0
6: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- higher
- lower
- the same
- there is no Group B1 refrigerants
7: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
8: A hotel is considered a _______ occupancy.
- institutional
- mercantile
- residential
- commercial
9: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 80%
- 90%
- 75%
- 100%
10: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- Well-lit exit signs
- Locked doors
- OSHA approved
11: High pressure controls should be set no higher than
- 10% of set point
- 25% of set point
- 90% of set point
- 80% of set point
12: What do you need to do when you install a new system?
- Document the superheat and subcooling reading
- Have it inspected
- Insulate the suction line before you take a superheat reading
- Add refrigerant
13: Can ammonia be used on domestic system?
- yes, for systems under 10 tons
- yes
- no
- no, unless there is proper ventilation system installed
14: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 10
- 25
- III
15: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class B machinery room
- Class A machinery room
- Class M machinery room
16: 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
17: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
18: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Magnesium
- Nickel
- Zinc
19: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Upon installation
- Not required
- Annually
20: How many refrigerant classifications are there for flammability?
- 1
- 2
- 3
- 7
21: What is an example of institutional occupancy?
- Football stadium
- Shopping mall
- Dorms
- Hospital
22: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 18
- 15
- 24
23: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Never can be allowed
24: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 330 lbs
- 55 lbs
- 660 lbs