Topics: ASHRAE/CMR
1: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Nickel
- Zinc
- Magnesium
2: Class A refrigerants are considered
- non-toxic
- toxic
- non-flammable
- flammable
3: 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
- 100
- 80
- 110
4: R-22 is considered a(n)
- HCFCH
- HFC
- CFC
- HCFC
5: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-1
- A-1
- B-2
6: What type of pressure relief device is used on a CO2 system?
- Gate valve
- Fusible plug
- Rupture disk
- Glove valve
7: Pipe identification labels are required when the system contains more than
- 65 lbs
- 110 lbs
- 55 lbs
- 120 lbs
8: Direct systems using Group II refrigerants
- shall be installed in Class T machinery rooms
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be allowed to be used for human comfort.
9: 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
10: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- public assembly occupancy
- institutional occupancy
- mixed occupancy
11: A Low-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection can not 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 a failed connection will enter the occupied space
12: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- low pressure
- high pressure
- critical pressure
- design pressure
13: The Board of Boilers adopts by reference
- MSCA Code
- Montreal Protocol Safety Code
- the 1997 ANSI/ASHRAE Safety Code
- the MACS Pressure Vessel Code of Massachusetts
14: NH3 is
- ammonia
- R-508A
- R-718
- lithium bromide
15: How many gallons of water do you need per pound of ammonia?
- 1
- 10
- 100
- 50
16: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class B machinery room
- Class A machinery room
- Class M machinery room
- Class T machinery room
17: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- black iron
- copper
- magnesium
18: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
19: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
20: Which refrigerant replaced R-12?
- R-410A
- R-22
- R-407A
- R-134A
21: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- Ceiling height
- 72"
- 7.25'
22: What do you need to do when you install a new system?
- Have it inspected
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
23: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Not required
- Annually
- Upon installation
24: Doors communicating with outside from a mechanical room must be?
- Self-closing, wooden, fire door
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
- Steel, approved, weather-stripped
25: What happens after your initial inspection of a pressure vessel?
- Notify the AHJ to let them know that the system been inspected
- Inspector leaves a metal tag with a certification listed on it
- Notify the Fire Marshal that the system has been inspected and approved
- There is a temporary shut-down until a final inspection can be performed.