ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: 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

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

2: Halo-carbon refrigerants cannot be used with what material?

  • Magnesium alloy
  • Aluminum
  • Copper
  • Stainless Steel

3: When an inspection is needed, how often must it be done?

  • every 24 months
  • every 18 months
  • annually
  • every 36 months

4: Direct systems using Group II refrigerants

  • shall be allowed to be used for human comfort.
  • 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

5: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UV or UR
  • UL and UM
  • UM or UL
  • UL and UR

6: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.

  • color-coded glass to determine type of refrigerant
  • moisture indicators
  • automatic closing shut-off valves
  • All of the above

7: Which refrigerant replaced R-12?

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

8: What is a Category "D" fluid?

  • A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
  • Any fluid that exceeds 150 psig and has design temperature of over 366F
  • A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
  • A typical refrigerant used on newer air conditioning and heat pump ssytems

9: Refrigeration piping before being buried shall be

  • leak tested
  • encased in pipe duct
  • pressure tested
  • All of the above

10: Before you change the type of refrigerant in a refrigeration system, what three things 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
  • nothing must be done

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

  • relief valve
  • bleed valve
  • service valve
  • condenser

12: A High-Probablity system

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

13: 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

14: Ammonia belongs to Group

  • B-1
  • B-2
  • A-1
  • A-2

15: Indirect systems using Group II refrigerants

  • shall be used for mechanical equipment only
  • shall be used in refrigeration system less than 1,000 lbs
  • shall have all refrigerant containing parts except piping, installed in a Class T machine room
  • shall be used in refrigeration system in excess of 1,000 lbs

16: Can you use Ammonia in industrial applications?

  • No, never
  • Yes, always
  • When mixed with R-718
  • Yes, Under certain condidtions

17: The gauge thickness required on a CO2 tank construction is

  • 5/16"
  • 1/8"
  • 1/16"
  • 3/32"

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

  • 50
  • 25
  • 22
  • 66

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

  • PVC
  • Aluminum
  • Stainless Steel
  • Copper

20: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.

  • 20
  • 10
  • 15
  • 25

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

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

22: Where are the three places that the discharge from an ammonia relief valve be piped?

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

23: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants

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

24: What type of relief valve is used on low pressure centrifugal compressor systems?

  • Spring-loaded relief valve
  • Rupture disc
  • Purge relief
  • None of the above

25: Pressure vessels with an internal volume of 3 cubic feet or more

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