ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and

  • explosion precautions must be taken
  • no flames shall be permitted
  • gas masks must be worn
  • the owner shall be informed

2: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.

  • 100
  • 550
  • 350
  • 50

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

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

4: Pipe identification labels are required when the system contains more than

  • 110 lbs
  • 65 lbs
  • 55 lbs
  • 120 lbs

5: 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

6: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.

  • 1
  • 1.2
  • 1.5
  • 2.2

7: How many refrigerant classifications are there for flammability?

  • 2
  • 3
  • 1
  • 7

8: Ammonia can come in contact with _______ ?

  • Copper tubing
  • Brass
  • Aluminum
  • Copper

9: Name a CFC refrigerant(s):

  • R-11
  • R-12
  • R-123
  • both a & b

10: The main cause of enacting the "no vending rule" of July 1st 1992 was

  • global warming potential
  • ozone depletion
  • both a & b
  • None of the above

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

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

12: Ammonia is under what safety classification?

  • B1
  • B3
  • B2
  • A3

13: 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

14: How many CFMs are required per square foot of commercial office occupied space

  • .5 CFM
  • 5 CFM
  • 15 CFM
  • 20 CFM

15: A class B2 refrigerant is considered

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

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

  • you can never change refrigerants
  • Place sign, check for leaks, and insulate suction line
  • Nothing must be done
  • Make sure its compatible, notify owner, and notify AHJ.

17: Which of the following are considered inorganic refrigerants?

  • R-717 and R-718
  • 410A and R-407C
  • R-500 and R-502
  • None of the above

18: Evaporators within 18" of a heating coil must be equipped with a

  • pressure relief device
  • zone valve
  • low limit control
  • high limit control

19: 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 volume of the compression chamber
  • 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

20: A class A3 refrigerant is considered

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

21: Most CFC's are

  • flammable
  • inert but toxic
  • toxic
  • inert

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

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

23: An example of direct system is

  • rooftop unit
  • chiller
  • absorber
  • none of the above

24: What pipe can not be used for refrigeration?

  • K
  • L
  • N
  • M

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

  • 10'
  • 25'
  • 15'
  • 36'