Topics: ASHRAE/CMR
1: Which refrigerant class listed below is the most flammable?
- A-1
- C-3
- A-3
- B-2
2: Relief valves are rated in
- gallons of water per hour
- pounds of air per hour
- pounds of air per minute
- gallons of water per minute
3: 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
4: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 50
- 75
- 20
- 15
5: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- high pressure
- low pressure
- design pressure
6: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
7: R-123 belongs to Group
- B-2
- B-1
- A-3
- B-3
8: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
9: The Department that certifies the transportation of refrigerant is the
- DOT
- EPA
- EPO
- RSES
10: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.0
- 3.0
- 2.5
- 5.5
11: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- a pressure relief device
- either a fusible plug or a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
12: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- fusible plug
- rupture plug
- relief plug
13: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- explosion precautions must be taken
- gas masks must be worn
- no flames shall be permitted
- the owner shall be informed
14: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 55 lbs
- 550 lbs
- 330 lbs.
15: 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
16: What section governs pressure vessels?
- OSHA
- Section 1 ASHREA 15 ASME fired
- Section 8 ASHREA 15 ASME unfired
- Section ASHREA 34
17: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
- Because it's water
- Because it's a non-flammable refrigerant
18: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the vapor side of the system
- low side of the system
- the liquid side of the system
- high side of the system
19: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
20: Doors communicating with outside from a mechanical room must be?
- Self-closing, approved, fire door
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
21: How many refrigerant classifications are there for flammability?
- 1
- 3
- 2
- 7
22: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
23: What refrigerant were phased out in 2004?
- R-11
- R-12
- R-22
- R-134a
24: 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.
25: What is the refrigerant chlorodifluoromethane?
- R-123
- R-12
- R-134a
- R-22