ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: 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

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

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

3: A class A3 refrigerant is considered

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

4: Ammonia is under what safety classification?

  • A3
  • B1
  • B3
  • B2

5: When can recovered refrigerants be reused?

  • They can't
  • Only when used in original owner's equipment
  • Only if used in 30 days of recovery
  • None of the above

6: 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

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

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

8: Machinery rooms must be vented to ______?

  • neutralizing tank
  • basement
  • outdoors
  • unoccupied spaces

9: Most CFC's are

  • inert but toxic
  • toxic
  • flammable
  • inert

10: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.

  • 100
  • 250
  • 350
  • 400

11: 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

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

  • atmosphere, tank containing water, where the A.H.J. indicates
  • underground, into drain, into mechanical room
  • to chemical neutralizing tank only
  • none of the above

13: Which occupancy can ammonia be used in?

  • depends on the quantity of freon
  • commercial
  • redifential
  • industrial

14: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?

  • Because it's a non-flammable refrigerant
  • R-718 is not rated unlimited because it's a dangerous refrigerant
  • Because it's cheap
  • Because it's water

15: 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.

  • 90
  • 110
  • 80
  • 100

16: What is the refrigerant dichlorodifluoromethane?

  • R-12
  • R-22
  • R-123
  • R-134A

17: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.

  • critical pressure
  • low pressure
  • high pressure
  • design pressure

18: Name a CFC refrigerant(s):

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

19: A pressure relief should be located at least _______ from windows and doors.

  • 20'
  • 30'
  • 15'
  • 25'

20: What happens after your initial inspection of a pressure vessel?

  • Inspector leaves a metal tag with a certification listed on it
  • There is a temporary shut-down until a final inspection can be performed.
  • Notify the AHJ to let them know that the system been inspected
  • Notify the Fire Marshal that the system has been inspected and approved

21: A declaration test is needed when the system contains more than

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

22: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.

  • CFC-11
  • HCFC-123
  • Lithium bromide
  • ammonia

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

  • 24
  • 48
  • 36
  • 18

24: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.

  • 50
  • 33
  • 18
  • 22

25: R-123 belongs to Group

  • B-1
  • B-2
  • A-3
  • B-3