Topics: ASHRAE/CMR
1: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the low side
- the high side
- the aggregate of the high side and low side
- 2.5 times the design pressure
2: What type of relief valve is used on a CO2 system?
- gate valve
- rupture disc
- fusible plug
- glove disc
3: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
4: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
5: Who authorizes changes to the safety codes?
- Board of Boilers
- Contractor who last serviced the system.
- Person who pulled the permit
- Person in charge of the facility
6: 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
7: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
8: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
9: NH3 is
- lithium bromide
- R-718
- ammonia
- R-508A
10: How many flammability classifications are refrigerants in?
- 5
- 3
- 7
- 2
11: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- gas masks must be worn
- explosion precautions must be taken
- the owner shall be informed
- no flames shall be permitted
12: Halogen refrigerants are corrosive to which type of metal?
- copper
- stainless steel
- black iron
- magnesium
13: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Classifed
- Insulated and installed in a pipe duct (Encased)
- Leak checked
- Certified
14: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
15: What refrigerant were phased out in 2004?
- R-134a
- R-12
- R-22
- R-11
16: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
17: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or less
- vessels of 10 cubic feet or more
18: 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 welder
- competent welder
- welder qualified
- licensed technician
19: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Relief valve
- Circuit Breaker
- T&P device
20: How many CFMs are required per square foot of commercial office occupied space
- .5 CFM
- 15 CFM
- 5 CFM
- 20 CFM
21: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a fusible plug
- a pressure relief device
22: R-123 belongs to Group
- B-3
- B-2
- B-1
- A-3
23: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
24: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class A machinery room
- Class M machinery room
- Class T machinery room
- Class B machinery room
25: What does safe access mean?
- Locked doors
- A clear unobstructed path to the equipment and controls
- Well-lit exit signs
- OSHA approved