ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: How far from the ground does a relief valve need to be?

  • At least 25' above grade
  • Not more than 3' above grade
  • At least 20' above grade
  • At least 15' above grade

2: 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

3: Refrigerants shall be classified by

  • requirements for commercial, industrial, and residential occupancies
  • maximum permissible quantities of each group
  • color codes
  • toxicity and flammability

4: How many refrigerant classifications are there for toxicity?

  • 2
  • 3
  • 5
  • 1

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

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

6: When should a relief valve start to function?

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

7: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.

  • 50
  • 55
  • 75
  • 15

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

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

9: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.

  • 80%
  • 75%
  • 90%
  • 99%

10: What pipe can not be used for refrigeration?

  • M
  • L
  • N
  • K

11: 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

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

  • 1
  • 2.2
  • 1.5
  • 1.2

13: No open flames are allowed in the machinery room unless?

  • Never can be allowed
  • Only when combustion air is provided from outside of the machinery room
  • Approved by the authorized person
  • Approved by the installing contractor

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

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

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

  • 10
  • 25
  • III
  • 15

16: A premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space such as auditoriums, ballrooms, classrooms, passenger depots, restaurants, and theaters is considered a(n)

  • public assembly occupancy
  • institutional occupancy
  • illegal occupancy
  • commercial occupancy

17: Ammonia (NH3) is a group III refrigerant

  • True
  • False

18: How are refrigerant blends classified?

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

19: 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

20: The discharge relief valve is located (9.4.6)

  • on top of the condensor
  • between the compressor and the stop valve
  • between the compressor and reciever
  • between the compressor and oil separator

21: A plug containing an alloy that will melt at a specific temperature to relief pressure is a

  • fusion plug
  • rupture plug
  • relief plug
  • fusible plug

22: Ammonia is under what safety classification?

  • A3
  • B2
  • B3
  • B1

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

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

24: What is the refrigerant chlorodifluoromethane?

  • R-22
  • R-123
  • R-12
  • R-134a

25: Which refrigerant class listed below is the most flammable?

  • A-3
  • C-3
  • B-2
  • A-1