Topics: ASHRAE/CMR
1: Which refrigerant class listed below is the most flammable?
- A-3
- B-2
- A-1
- C-3
2: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UL and UM
- UV or UR
- UM or UL
3: How far from the window does a relief valve need to be according to ASHRAE-15?
- There is no minimum for relief valve and windows.
- At least 30'
- At least 40'
- At least 20'
4: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- III
- 25
- 10
- 15
5: R-123 belongs to Group
- B-1
- A-3
- B-2
- B-3
6: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- automatic ventilation
- self-closing doors
- tight fitting doors
7: 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
8: When air is ducted through a machine room that services occupied space, What must be done?
- Flanged and gasketed
- Insulated and cross broke
- Welded and seamed.
- Ducted and sealed
9: What would be the classification of a church?
- Place of assembly
- Institutional
- Industrial
- Large mercantile
10: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 100%
- 80%
- 75%
11: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Foot valve
- Moisture indicator
- Muffler
- Stop valve
12: Refrigerants shall be classified by
- color codes
- requirements for commercial, industrial, and residential occupancies
- maximum permissible quantities of each group
- toxicity and flammability
13: Which refrigerant class listed below is the most flammable?
- C3
- A2
- B2
- A3
14: What is not a requirement of a Class T machine room?
- Automatic ventilation
- Self-closing doors
- Tight fitting doors
- Fire hose connected to the building fire protection system.
15: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
16: What must be done to refrigerant pipes before being buried?
- Coated
- Leaked checked
- Encased
- Certified
17: Relief valves are rated in
- gallons of water per minute
- gallons of water per hour
- pounds of air per minute
- pounds of air per hour
18: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
19: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
20: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is a system highly likely to leak from a failed connection or component of such system
21: What do you need to do when you install a new system?
- Insulate the suction line before you take a superheat reading
- Have it inspected
- Add refrigerant
- Document the superheat and subcooling reading
22: Name three things that must be done when changing refrigeration lubricant?
- Nothing must be done
- Make sure it's compatible, notify owner, notify AHJ
- You can't change lubricants.
- Place sign, check for leaks, insulate
23: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-1
- A-2
- B-2
24: 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.
25: What pipe can not be used for refrigeration?
- L
- N
- K
- M