Topics: ASHRAE/CMR
1: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- institutional occupancy
- commercial occupancy
- mixed occupancy
2: 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
- 2.5, 3.0
- 3.0, 3.5
3: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a pressure relief device
- a fusible plug
- 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
4: 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
5: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
6: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 660 lbs
- 330 lbs.
- 550 lbs
7: Halogenated refrigerants cannot be used with what material?
- Magnesium alloy
- Aluminum
- Copper
- Stainless steel
8: Relief valves are rated in
- pounds of air per minute
- pounds of air per hour
- gallons of water per hour
- gallons of water per minute
9: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the evaporator
10: 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
11: 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.
12: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use pressure relief devices
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
13: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
14: 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
15: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
16: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 660 lbs
- 500 lbs
17: How far from the ground does a relief valve need to be?
- At least 15' above grade
- Not more than 3' above grade
- At least 25' above grade
- At least 20' above grade
18: 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
19: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?
- 1,000
- 100,000
- 100
- 10,000
20: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device and a pressure relief valve installed
- shall have a pressure limiting device installed on the high side of the system
- shall be inspected by the Boiler of Inspectors bi-annually
- does not require a pressure-limiting device
21: What kind of material can't be used on the outlet of a relief valve?
- PVC
- Stainless Steel
- Copper
- Aluminum
22: A relief valve discharge capacity is rated in
- PSIA
- PSIG
- Pounds of air per minute.
- temperature minus pounds of air per second divided by release rate squared
23: Which refrigerant class listed below is the most flammable?
- B2
- A2
- A3
- C3
24: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
25: 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
- Lithium bromide
- CFC-11