ASHRAE/CMR code Prep Quiz

Topics: ASHRAE/CMR

Quiz Result Settings

1: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.

  • True
  • False

2: The main purpose of a refrigerant detector in a machinery room is to

  • inform there is a refrigerant leak int he system
  • detect toxins in the air caused by a refrigerant leak
  • to set off an alarm when there is refrigerant present inside the room
  • all of the above

3: Direct systems using Group II refrigerants

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

4: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.

  • True
  • False

5: Fusible plugs must have what marked on them?

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

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

  • 80%
  • 90%
  • 100%
  • 75%

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

  • 48
  • 18
  • 36
  • 24

8: R-123 belongs to Group

  • B-2
  • B-3
  • A-3
  • B-1

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

  • To chemical neutralizing tank only
  • Underground, into drain, into mechanical room
  • Atmosphere, Tank containing water, where the AHJ indicates.
  • None of the above.

10: Methyl Chloride is a halogenated refrigerant and should not come in contact with

  • aluminum
  • zinc
  • magnesium
  • all of the above

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

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

12: R-22 falls under which safety classification?

  • A-1
  • B-2
  • A-2
  • B-1

13: When air is ducted through a machine room that services occupied space, What must be done?

  • Ducted and sealed
  • Insulated and cross broke
  • Flanged and gasketed
  • Welded and seamed.

14: All electrical work done on refrigeration systems must comply with

  • ASHREA-15 Section 9.2.1
  • OSHA
  • NEC and Massachusetts Modifications
  • Department of Energy

15: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.

  • UL and UM
  • UL and UR
  • UV or UR
  • UM or UL

16: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the

  • boiler
  • compressor
  • outside the machinery room
  • evaporator

17: 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

18: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?

  • fusible plug
  • relief valve
  • rupture disc
  • all of the above

19: What is the minimum height refrigeration piping should be placed against walls?

  • 7.25'
  • 72"
  • 6'
  • Ceiling height

20: A Category D fluid

  • is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
  • is when the design pressure does not exceed 150 psi
  • a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
  • Both a and b are correct

21: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?

  • R-113
  • R-11
  • R-22
  • R-12

22: Class 3 refrigerants are

  • highly flammable
  • non-flammable
  • toxic
  • non-toxic

23: How many different groups of refrigerants are there?

  • 3
  • 11
  • 15
  • 7

24: High pressure controls should be set no higher than

  • 10% of set point
  • 25% of set point
  • 80% of set point
  • 90% of set point

25: Low temperature systems should have what?

  • High pour point
  • Low pour point
  • High viscosity
  • None of the above