ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: A class B1 refrigerant is considered

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

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

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

3: Name three things that must be done when changing refrigeration lubricant?

  • Nothing must be done
  • You can't change lubricants.
  • Place sign, check for leaks, insulate
  • Make sure it's compatible, notify owner, notify AHJ

4: R-717 is

  • water
  • ammonia
  • trichloromethane
  • carbon dioxide

5: 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.

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

6: 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.

  • 15
  • 75
  • 50
  • 55

7: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into

  • the low-pressure side of the system
  • the high side of the system
  • the liquid receiver
  • both a and c are correct

8: Class T machine room

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

9: 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

10: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.

  • 3
  • 2
  • 5
  • 1

11: 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

12: What is the minimum size of the discharge pipe?

  • Same size as the outlet of the relief valve
  • One pipe size larger that the inlet of the relief valve
  • Depends on size of manifold
  • All of the above

13: When should a relief valve start to function?

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

14: Each machinery room shall contain

  • smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
  • a refrigerant detector located in an area where the refrigerant from a leak will concentrate
  • a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
  • high and low pressure controls

15: Which refrigerant replaced R-12?

  • R-134A
  • R-407A
  • R-410A
  • R-22

16: What is an egress?

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

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

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

18: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant

  • does not require a pressure-limiting device
  • shall be inspected by the Boiler of Inspectors bi-annually
  • shall have a pressure limiting device and a pressure relief valve installed
  • shall have a pressure limiting device installed on the high side of the system

19: Refrigerants shall be classified by

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

20: Can ammonia be used on domestic system?

  • yes, for systems under 10 tons
  • yes
  • no, unless there is proper ventilation system installed
  • no

21: What must be done to refrigerant pipes before being buried ?(8.10.4)

  • Leak checked
  • Insulated and installed in a pipe duct (Encased)
  • Certified
  • Classifed

22: What pipe can not be used for refrigeration?

  • L
  • K
  • N
  • M

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

  • 15'
  • 36'
  • 25'
  • 10'

24: What type of relief valve is used on a CO2 system?

  • gate valve
  • glove disc
  • fusible plug
  • rupture disc

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

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