Topics: ASHRAE/CMR
1: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 350
- 50
- 550
- 100
2: How many CFMs are required per square foot of commercial office occupied space
- 15 CFM
- 20 CFM
- .5 CFM
- 5 CFM
3: A class B2 refrigerant is considered
- non-toxic and non-flammable
- toxic and somewhat flammable
- non-toxic and highly flammable
- toxic and non-flammable
4: 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
5: 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
- competent welder
- licensed welder
6: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
7: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
8: Machinery rooms must be vented to ______?
- basement
- neutralizing tank
- unoccupied spaces
- outdoors
9: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
10: What is R-22?
- Chlorodifluoromethane
- CCFCM
- HFC
- Chlorofluoromethane
11: The color code of a tank of ammonia is
- silver
- lavender
- white
- light green
12: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 7.25'
- Ceiling height
- 72"
13: A hotel is considered a _______ occupancy.
- residential
- mercantile
- commercial
- institutional
14: Halogenated refrigerants cannot be used with what material?
- Stainless steel
- Copper
- Aluminum
- Magnesium alloy
15: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
16: 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
17: Who is permitted to access a refrigeration machine room?
- Anyone, it's a completely safe area
- Authorized persons only
- Any employee
- Contractors only
18: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
19: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class B machinery room
- Class M machinery room
- Class A machinery room
- Class T machinery room
20: What is not a requirement of a Class T machine room?
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Tight fitting doors
- Automatic ventilation
21: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
22: 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
23: A class A3 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
24: How many gallons of water per pound of ammonia do you need?
- 1
- 5
- 20
- 15
25: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 100
- 330
- 200