Topics: ASHRAE/CMR
1: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
2: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- mixed occupancy
- institutional occupancy
- public assembly occupancy
3: What is not a requirement of a Class T machine room?
- Fire hose connected to the building fire protection system.
- Automatic ventilation
- Tight fitting doors
- Self-closing doors
4: Which refrigerant class listed below is the most flammable?
- A3
- B2
- A2
- C3
5: The Department that certifies the transportation of refrigerant is the
- DOT
- EPO
- RSES
- EPA
6: Can ammonia be used on domestic system?
- yes
- no
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
7: Which refrigerant replaced R-12?
- R-22
- R-407A
- R-410A
- R-134A
8: Direct systems using Group II refrigerants
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be allowed to be used for human comfort.
9: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 500 lbs
- 660 lbs
- 330 lbs
10: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
11: What is Trichlorotrifluoromethane?
- R-11
- R-113
- R-13
- R-12
12: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
13: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
14: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
15: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- there is no Group B1 refrigerants
- higher
- lower
- the same
16: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 100
- 80
- 110
17: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
18: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Glove valve
- Gate valve
- Fusible plug
19: What is the refrigerant dichlorodifluoromethane?
- R-22
- R-134A
- R-12
- R-123
20: How far from the ground does a relief valve need to be?
- At least 15' above grade
- At least 20' above grade
- Not more than 3' above grade
- At least 25' above grade
21: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- high side of the system
- low side of the system
- the liquid side of the system
- the vapor side of the system
22: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and the stop valve
- between the compressor and oil separator
- between the compressor and reciever
23: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
24: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 1000F
- 600F
- 700F
25: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When there are sprinklers above
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system