Topics: ASHRAE/CMR
1: When should a relief valve start to function?
- 10 psi before it's set pressure
- Two times it's working pressure
- Before the purge station discharges
- At it's set pressure
2: The color code of a tank of ammonia is
- silver
- white
- lavender
- light green
3: How many CFMs are required per square foot of commercial office occupied space
- 20 CFM
- 15 CFM
- 5 CFM
- .5 CFM
4: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
5: How many gallons of water do you need per pound of ammonia?
- 1
- 100
- 50
- 10
6: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- there is no Group B1 refrigerants
- higher
- the same
- lower
7: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
- shall be installed per instruction of the AHJ
8: 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
9: High pressure controls should be set no higher than
- 80% of set point
- 10% of set point
- 25% of set point
- 90% of set point
10: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
11: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
12: Ammonia can come in contact with _______ ?
- Copper
- Copper tubing
- Aluminum
- Brass
13: A relief valve shall be located at least ___ above grade.
- 36'
- 25'
- 15'
- 10'
14: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 75%
- 80%
- 90%
- 100%
15: 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.
- ammonia
- HCFC-123
- CFC-11
- Lithium bromide
16: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
17: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
18: What refrigerant were phased out in 2004?
- R-22
- R-12
- R-11
- R-134a
19: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 550 lbs
- 660 lbs
- 55 lbs
- 330 lbs.
20: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 square feet or less
- 3 cubic feet or more
- 15 cubic feet or more
21: What is Trichlorotrifluoromethane?
- R-11
- R-12
- R-113
- R-13
22: What is not a requirement of a class T machine room?
- automatic ventilation
- self-closing doors
- fire hose connection to the building fire protection system
- tight fitting doors
23: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Rupture disk
- Gate valve
- Glove valve
24: What refrigerant is an inorganic compound?
- R-22
- Ammonia
- R-410A
- R-132A
25: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above