Topics: ASHRAE/CMR
1: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- Machinery rooms need not be vented
- the outdoors
- the mechanical room housing the refrigeration system
- the return air ducted system
2: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 22
- 66
- 50
- 25
3: Ammonia (NH3) is a group III refrigerant
- True
- False
4: 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
5: A person holding a license as a refrigeration technician may connect or disconnect for the purpose of installation, repair, or replacement, any electrical device or control to be a part of a refrigeration or air conditioning system, from the
- 24 volt secondary side of the Class 2 transformer to the thermostat
- load-side of the contactor in
- breaker panel in
- first disconnect in
6: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- higher
- there is no Group B1 refrigerants
- lower
- the same
7: How many gallons of water do you need per pound of ammonia?
- 1
- 100
- 10
- 50
8: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
9: What is a Category "D" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
10: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- no flames shall be permitted
- explosion precautions must be taken
- gas masks must be worn
- the owner shall be informed
11: 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
12: Insurance companies shall forward each inspection report of all refrigeration or A/C systems to the Chief of Inspections within
- 30 days
- 2 months
- 1 week
- 14 days
13: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Automatic ventilation
- Fire hose connected to the building fire protection system.
- Self-closing doors
14: R-123 belongs to Group
- A-3
- B-1
- B-2
- B-3
15: 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
16: 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 oil separator
- between the compressor and reciever
17: What would be the classification for Stop & Shop grocery store?
- Industrial
- Instituional
- Large mercantile
- Place of assembly
18: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
19: 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
20: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- OSHA approved
- Well-lit exit signs
- Locked doors
21: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-11
- R-22
- R-134A
22: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 30'
- There is no minimum for relief valve and windows.
- At least 20'
- At least 40'
23: What is the refrigerant chlorodifluoromethane?
- R-22
- R-134a
- R-123
- R-12
24: Pressure limiting devices are not required for systems containing less then ________ refrigerants.
- 6.6 lbs
- 22 lbs
- 44 lbs
- 13.9 lbs
25: What type of material can't be used on the outlet of a relief valve?
- PVC
- Stainless steel
- Magnesium alloy
- Copper