ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.

  • the outdoors
  • the return air ducted system
  • the mechanical room housing the refrigeration system
  • Machinery rooms need not be vented

2: High pressure controls should be set no higher than

  • 10% of set point
  • 80% of set point
  • 90% of set point
  • 25% of set point

3: A High-Probability System

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

4: What is a Category "M" fluid?

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

5: The certificate of inspection

  • shall be posted and protected from dirt, water, and other elements
  • shall be authorized by a notarized insurance company
  • shall be $20 and an additional fee of $1 for each tone above 20 tons
  • shall be posted on the compressor shell or electrical panel at the unit

6: Where a refrigeration or air conditioning system is installed,

  • it shall not be operated below prescribed pressuers
  • the form or certificate shall be authorized by the Department of Public Safety
  • The company who installed the system must notify the fire department in the jurisdiction where installed
  • A field inspection shall be made before it is put into service

7: Fusible plugs shall not be used with pressure vessels of

  • 3 cubic feet or less
  • 15 square feet or less
  • 3 cubic feet or more
  • 15 cubic feet or more

8: 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.

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

9: How many refrigerant classifications are there for flammability?

  • 7
  • 2
  • 3
  • 1

10: Systems containing more than 110 pounds must have stop valves located at the

  • compressor suction inlet
  • compressor discharge outlet
  • receiver inlet and outlet
  • All of the above

11: Refrigerant restricted in 2004 but used for transition for decades:

  • R-22
  • R-123
  • R-134A
  • R-11

12: Dual-pressure relief devices should be installed on

  • vessels of 10 cubic feet or less
  • vessels of 10 cubic feet or more
  • vessels of 3 cubic feet or less
  • vessels of 3 cubic feet or more

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

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

14: 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

15: How are refrigerant blends classified?

  • Based on worst case fractionation
  • Based on the oil used
  • Based on best case Fractionation
  • Blends don't have to be classified

16: The 522 CMR 9.00 has adopted for reference ASHRAE ____

  • 25
  • III
  • 10
  • 15

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

  • Zinc
  • Aluminum
  • Copper
  • Magnesium

18: How many refrigerant classifications are there for toxicity?

  • 5
  • 3
  • 2
  • 1

19: A class B1 refrigerant is considered

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

20: A High-Probablity system

  • is such that a leak of refrigerant from failed connections will enter the unoccupied space
  • is such that any leak will cause injury or death to anyone within a 100 square foot area
  • is a system highly likely to leak from a failed connection or component of such system
  • is such that a leak of refrigerant from failed connections will enter the occupied space

21: A movie theater would be considered a

  • mixed occupancy
  • institutional occupancy
  • public assembly occupancy
  • commercial occupancy

22: 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

23: R-22 is classified as a ____ refrigerant on the safety matrix.

  • B-1
  • A-1
  • B-2
  • A-2

24: Class T machine room

  • has no flame producing apparatus permanently installed
  • shall include closets used for setting equipment
  • shall have remote controls to stop the action of the refrigerant compressor
  • shall have refrigerant leak detecting systems installed inside and outside the room

25: Where must a refrigeration contractor's license number be displayed?

  • Truck, office, every job, and on all equipment
  • Uniforms, checks, and invoices.
  • Trucks, invoices, and advertising
  • Trucks, license plates, and uniforms