ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

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

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

2: Name three things that must be done when changing refrigeration lubricant?

  • Place sign, check for leaks, insulate
  • Make sure it's compatible, notify owner, notify AHJ
  • You can't change lubricants.
  • Nothing must be done

3: 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

4: What type of pressure relief device is used on a CO2 system?

  • Glove valve
  • Gate valve
  • Fusible plug
  • Rupture disk

5: A relief valve discharge capacity is rated in

  • PSIG
  • temperature minus pounds of air per second divided by release rate squared
  • PSIA
  • Pounds of air per minute.

6: The discharge relief valve is located (9.4.6)

  • between the compressor and oil separator
  • on top of the condensor
  • between the compressor and reciever
  • between the compressor and the stop valve

7: What do you need to do when you install a new system?

  • Document the superheat and subcooling reading
  • Insulate the suction line before you take a superheat reading
  • Add refrigerant
  • Have it inspected

8: When a refrigerating machinery room is used, the emergency procedures shall be posted

  • inside the room, immediately adjacent to each door
  • on a conspicuous card located near the compressor
  • on a conspicuous card located near the evaporator
  • outside the room, immediately adjacent to each door

9: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 66
  • 50
  • 22
  • 25

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

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

11: A relief valve shall be located at least ___ above grade.

  • 36'
  • 10'
  • 25'
  • 15'

12: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 22
  • 18
  • 33

13: The Department that certifies the transportation of refrigerant is the

  • RSES
  • EPO
  • DOT
  • EPA

14: Setting a pressure relief device shall not exceed ___ of the design pressure

  • 75%
  • 80%
  • 100%
  • 90%

15: How many different groups of refrigerants are there?

  • 7
  • 15
  • 3
  • 11

16: 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 high side
  • 2.5 times the design pressure
  • the low side
  • the aggregate of the high side and low side

17: R-22 is considered a(n)

  • HCFC
  • CFC
  • HCFCH
  • HFC

18: A class B1 refrigerant is considered

  • non-toxic and non-flammable
  • non-toxic but highly flammable
  • toxic but non-flammable
  • toxic and somewhat flammable

19: What type of material can't be used on the outlet of a relief valve?

  • Stainless steel
  • Magnesium alloy
  • Copper
  • PVC

20: When air is ducted through a machine room that services occupied space, What must be done?

  • Flanged and gasketed
  • Insulated and cross broke
  • Welded and seamed.
  • Ducted and sealed

21: 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

22: A High-Probability System

  • 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 an unoccupied space
  • is such that a leak of refrigerant from a failed connection will enter the occupied space
  • is a system highly likely to leak form a failed connection or component of such system

23: Which of the following is an inorganic refrigerant?

  • R-22
  • Ammonia
  • Chlorofluorocarbons
  • All of the above

24: Which occupancy can ammonia be used in?

  • redifential
  • industrial
  • depends on the quantity of freon
  • commercial

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

  • copper
  • stainless steel
  • magnesium
  • black iron