Topics: ASHRAE/CMR
1: Class T machine room
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
2: Halogen refrigerants are corrosive to which type of metal?
- copper
- magnesium
- stainless steel
- black iron
3: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 200
- 330
- 100
4: A professional or office building would be considered what type of occupancy?
- commercial
- public assembly
- mercantile
- business
5: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
6: Which occupancy can ammonia be used in?
- redifential
- depends on the quantity of freon
- industrial
- commercial
7: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
8: How much clearance do you need around the perimeter of electrical panels?
- 36"
- 18"
- 24"
- 12"
9: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- does not require a pressure-limiting device
- shall have a pressure limiting device installed on the high side of the system
- shall have a pressure limiting device and a pressure relief valve installed
- shall be inspected by the Boiler of Inspectors bi-annually
10: What happens after your initial inspection of a pressure vessel?
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.
- Inspector leaves a metal tag with a certification listed on it
- Notify the AHJ to let them know that the system been inspected
11: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 75%
- 90%
- 99%
- 80%
12: Ammonia (NH3) is a group III refrigerant
- True
- False
13: 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.
14: 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
15: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 5.5
- 2.0
- 3.0
16: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the mechanical room housing the refrigeration system
- the outdoors
- Machinery rooms need not be vented
17: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Nickel
- Zinc
- Magnesium
18: R-22 is considered a(n)
- HCFC
- CFC
- HFC
- HCFCH
19: High pressure controls should be set no higher than
- 80% of set point
- 25% of set point
- 10% of set point
- 90% of set point
20: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
21: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.25'
- 7.00'
- 8'4"
- 9.00'
22: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
23: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
24: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- commercial occupancy
- public assembly occupancy
25: 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