ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: What happens after your initial inspection of a pressure vessel?

  • Inspector leaves a metal tag with a certification listed on it
  • Notify the AHJ to let them know that the system been inspected
  • 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.

2: Pressure vessels with an internal volume of 10 cubic feet or more

  • shall use fusible plugs
  • shall use pressure relief devices or fusible plugs
  • shall use pressure relief devices
  • shall use rupture discs or duel pressure relief valves

3: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.

  • the atmosphere
  • a de-pressurized recovery tank with a silver top and yellow bottom
  • a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
  • All of the above

4: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Insulated and installed in a pipe duct (Encased)
  • Classifed
  • Leak checked
  • Certified

5: What is the minimum height refrigeration piping should be placed against walls?

  • 7.25'
  • 72"
  • Ceiling height
  • 6'

6: Each machinery room shall contain

  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
  • high and low pressure controls

7: 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

8: Stop valves shall not be permitted between the system and the

  • bleed valve
  • relief valve
  • service valve
  • condenser

9: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 75
  • 15
  • 55
  • 50

10: How much clearance do you need around the perimeter of electrical panels?

  • 24"
  • 18"
  • 12"
  • 36"

11: 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

12: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

13: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.

  • containing R-11, R-123 & R-717 exclusively shall not be prohibited
  • shall not be prohibited
  • of Group B2 refrigerant shall be prohibited
  • shall be prohibited

14: Which refrigerant replaced R-12?

  • R-410A
  • R-407A
  • R-134A
  • R-22

15: A positive displacement compressor is

  • is a reciprocating type compressor with 2 or more pistons
  • a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
  • where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
  • a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber

16: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-1
  • B-1
  • A-2
  • B-2

17: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.

  • 48
  • 18
  • 24
  • 36

18: Halogen refrigerants are corrosive to which type of metal?

  • copper
  • black iron
  • magnesium
  • stainless steel

19: Before you change the type of refrigerant in a refrigeration system, what three things must be done?

  • nothing must be done
  • you can't change refrigerants
  • place sign, check for leaks, insulate
  • make sure it's compatible, notify owner, notify A.H.J

20: 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

21: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.

  • 15
  • 20
  • 50
  • 75

22: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.

  • there is no Group B1 refrigerants
  • the same
  • lower
  • higher

23: A 3-cubic foot receiver must have what type of relief valve?

  • fusible plug
  • relief valve
  • rupture device
  • none of the above

24: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • “UM” and “UV”
  • “UL”
  • “UV”
  • “U” or “UM”

25: Most CFC's are

  • flammable
  • inert but toxic
  • inert
  • toxic