Topics: ASHRAE/CMR
1: Which refrigerant class listed below is the most flammable?
- A-3
- B-2
- A-1
- C-3
2: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
3: What is Trichlorotrifluoromethane?
- R-12
- R-11
- R-113
- R-13
4: How far from the ground does a relief valve need to be?
- Not more than 3' above grade
- At least 25' above grade
- At least 15' above grade
- At least 20' above grade
5: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
6: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- At least 30'
- There is no minimum for relief valve and windows.
- At least 40'
7: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-12
- R-502
- R-113
8: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Pressurized
- Insulated
- Leak tested
9: R-717 is
- ammonia
- trichloromethane
- carbon dioxide
- water
10: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 80
- 110
- 100
11: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- Machinery rooms need not be vented
- the mechanical room housing the refrigeration system
- the outdoors
12: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
13: R-123 belongs to Group
- B-2
- B-1
- A-3
- B-3
14: 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
- licensed technician
- licensed welder
- competent welder
- welder qualified
15: What would be the classification for Stop & Shop grocery store?
- Industrial
- Place of assembly
- Instituional
- Large mercantile
16: What type of copper is not permitted on refrigeration systems?
- Type M
- Type N
- Type L
- Type K
17: How many gallons of water per pound of ammonia do you need?
- 1
- 5
- 15
- 20
18: High pressure controls should be set no higher than
- 90% of set point
- 25% of set point
- 10% of set point
- 80% of set point
19: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 22
- 18
- 50
20: Most CFC's are
- inert but toxic
- toxic
- flammable
- inert
21: Who is permitted to access a refrigeration machine room?
- Contractors only
- Authorized persons only
- Any employee
- Anyone, it's a completely safe area
22: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-1
- B-2
- A-2
23: How are refrigerant blends classified?
- Blends don't have to be classified
- Based on worst case fractionation
- Based on best case Fractionation
- Based on the oil used
24: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Self-closing, wooden, fire door
25: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 3.0
- 2.0
- 2.5