Topics: ASHRAE/CMR
1: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-2
- B-1
- A-2
- A-1
2: 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
3: Evaporators within 18" of a heating coil must be equipped with a
- low limit control
- pressure relief device
- zone valve
- high limit control
4: What is the minimum height refrigeration piping should be placed against walls?
- 7.25'
- 72"
- Ceiling height
- 6'
5: Class T machine room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall include closets used for setting equipment
6: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-1
- A-2
- B-2
7: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be allowed to be used for human comfort.
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
8: What refrigerant doesn't have to be classifted?
- R-717
- R-711
- R-134a
- R-718
9: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When it's used as part of a supply or return air system
- When its white
- When there are sprinklers above
- When there is a space 6' or more above it
10: Which refrigerant class listed below is the most flammable?
- A-1
- A-3
- C-3
- B-2
11: 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
12: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 2 months
- 1 week
- 14 days
- 30 days
13: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
14: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
15: Ammonia is under what safety classification?
- B1
- A3
- B2
- B3
16: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
17: What pipe can not be used for refrigeration?
- K
- M
- L
- N
18: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- business occupancy
- public assembly occupancy.
- commercial occupancy
19: 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.
20: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- the same
- there is no Group B1 refrigerants
- lower
21: Who is permitted to access a refrigeration machine room?
- Any employee
- Contractors only
- Authorized persons only
- Anyone, it's a completely safe area
22: What type of relief valve is used on a CO2 system?
- glove disc
- rupture disc
- gate valve
- fusible plug
23: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Circuit Breaker
- Relief valve
- T&P device
24: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
25: A Low-Probability System
- 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 a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system