ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: 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

2: How many refrigerant classifications are there for flammability?

  • 7
  • 3
  • 2
  • 1

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.

  • 80
  • 90
  • 100
  • 110

4: Halogenated refrigerants cannot be used with what material?

  • Aluminum
  • Stainless steel
  • Magnesium alloy
  • Copper

5: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the

  • load-side of the contactor in
  • first disconnect in
  • breaker panel in
  • 24 volt secondary side of the Class 2 transformer to the thermostat

6: Can ammonia be used on domestic system?

  • no
  • yes, for systems under 10 tons
  • yes
  • no, unless there is proper ventilation system installed

7: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed

  • 55 lbs
  • 660 lbs
  • 550 lbs
  • 330 lbs.

8: Pressure vessels with an internal volume of 3 cubic feet or less

  • shall use fusible plugs
  • shall use pressure relief devices
  • do not need pressure relief protection
  • shall use pressure relief devices or fusible plugs

9: Before determining if a machinery room equipment is excluded from following Ashrae 15, you must determine how many pounds of refrigerant per _____ cubic feet?

  • 10,000
  • 100
  • 1,000
  • 100,000

10: _____ and its alloys are suitable for use with ammonia systems.

  • Magnesium
  • Copper
  • Aluminum
  • Zinc

11: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.

  • True
  • False

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

  • True
  • False

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

  • 24
  • 36
  • 48
  • 18

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

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

15: 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.

  • 15
  • 55
  • 50
  • 75

16: A class A3 refrigerant is considered

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

17: Pressure vessels nameplate markings must be compliant with the

  • ASHRAE 34 Standards
  • CMR-588 & CMR-528
  • ASME Boiler and Pressure Vessel Code
  • All of the Above

18: R-717 is

  • ammonia
  • carbon dioxide
  • trichloromethane
  • water

19: R-11 belongs to Group

  • B-3
  • A-1
  • B-1
  • A-2

20: A machine room with a refrigerant system using ammonia shall

  • be provided with a continuously operated ventilation system
  • be considered a non-hazardous location in accordance with National Electrical code
  • have no flame producing apparatus permanently installed and operated
  • All of the above

21: A High-Probability System

  • 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
  • is such that any leak will cause injury or death to anyone within a 100 square foot area

22: Pressure limiting devices are not required for systems containing less then ________ refrigerants.

  • 6.6 lbs
  • 13.9 lbs
  • 44 lbs
  • 22 lbs

23: What pipe can not be used for refrigeration?

  • L
  • M
  • N
  • K

24: What is Trichlorotrifluoromethane?

  • R-12
  • R-13
  • R-11
  • R-113

25: How far from the window does a relief valve need to be according to ASHRAE-15?

  • At least 20'
  • At least 30'
  • At least 40'
  • There is no minimum for relief valve and windows.