Topics: ASHRAE/CMR
1: Name three things that must be done when changing refrigeration lubricant?
- Nothing must be done
- You can't change lubricants.
- Place sign, check for leaks, insulate
- Make sure it's compatible, notify owner, notify AHJ
2: 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
3: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- C-3
- B-2
4: 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.
5: What is an egress?
- An escape route
- A valve put on the low side of the system to prevent frosting
- A code violation
- An entrance or exit
6: What is the refrigerant chlorodifluoromethane?
- R-134a
- R-123
- R-22
- R-12
7: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 1/8"
- 3/32"
- 1/16"
8: Class T machine room
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- has no flame producing apparatus permanently installed
9: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 50
- 33
- 18
10: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- A-2
- B-1
- A-1
11: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
12: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When it's used as part of a supply or return air system
- When there are sprinklers above
- When there is a space 6' or more above it
13: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UM” and “UV”
- “UL”
- “UV”
- “U” or “UM”
14: 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
15: Direct systems using Group II refrigerants
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
16: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 2.5
- 3.0
- 2.0
- 5.5
17: A pressure relief should be located at least _______ from windows and doors.
- 25'
- 30'
- 20'
- 15'
18: Evaporators within 18" of a heating coil must be equipped with a
- pressure relief device
- high limit control
- low limit control
- zone valve
19: A class B1 refrigerant is considered
- toxic but non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
20: High pressure controls should be set no higher than
- 25% of set point
- 10% of set point
- 90% of set point
- 80% of set point
21: What would be the classification of a church?
- Industrial
- Place of assembly
- Large mercantile
- Institutional
22: Who approves containers for refrigerants?
- E.P.A
- D.O.D
- D.O.T
- D.O.E
23: How many different groups of refrigerants are there?
- 15
- 7
- 11
- 3
24: Who is permitted to access a refrigeration machine room?
- Anyone, it's a completely safe area
- Authorized persons only
- Contractors only
- Any employee
25: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code
- welder qualified
- licensed technician
- licensed welder
- competent welder