ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

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

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

2: Most CFC's are

  • inert but toxic
  • toxic
  • flammable
  • inert

3: Indirect systems using Group II refrigerants

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

4: When should a relief valve start to function?

  • Before the purge station discharges
  • Two times it's working pressure
  • 10 psi before it's set pressure
  • At it's set pressure

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

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

6: What type of refrigerants are NOT flammable?

  • CHC
  • HFC
  • HCFC
  • All of the above

7: Direct systems using Group II refrigerants

  • shall not be used for air condition for human comfort
  • shall be installed in Class T machinery rooms
  • shall be allowed to be used for human comfort.
  • shall be installed per instruction of the AHJ

8: 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

9: R-123 belongs to Group

  • B-1
  • B-2
  • A-3
  • B-3

10: A class B1 refrigerant is considered

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

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

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

12: What was the main reason for enacting the no venting rule of July 1, 1992?

  • Ozone depletion
  • Green house effect
  • Global warming potential
  • All of the above

13: Fusible plugs must have what marked on them?

  • Melting temperature in F
  • Melting temperature in C
  • Opening pressure
  • All of the above

14: 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

15: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8

  • high side of the system
  • low side of the system
  • the liquid side of the system
  • the vapor side of the system

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

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

17: What is an egress?

  • An escape route
  • An entrance or exit
  • A valve put on the low side of the system to prevent frosting
  • A code violation

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

  • 80%
  • 75%
  • 100%
  • 90%

19: Ammonia belongs to Group

  • B-1
  • A-2
  • A-1
  • B-2

20: R-410A is classified as a ____ refrigerant on the safety matrix.

  • A-2
  • B-1
  • A-1
  • B-2

21: What is Trichlorotrifluoromethane?

  • R-12
  • R-11
  • R-113
  • R-13

22: All welding done on any refrigeration system or piping covered by 522 CMR 9.00 shall be performed by a according to Section IX of the ASME code

  • licensed technician
  • competent welder
  • welder qualified
  • licensed welder

23: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.

  • 6.6, 6.6
  • 2.5, 3.0
  • 2.5, 2.5
  • 3.0, 3.5

24: 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

25: 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