Topics: ASHRAE/CMR
1: Class T machine room
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
2: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the mechanical room housing the refrigeration system
- the outdoors
- Machinery rooms need not be vented
3: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- no flames shall be permitted
- gas masks must be worn
- explosion precautions must be taken
- the owner shall be informed
4: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- phosgene gas sening
- refrigerant sensing
- A group sensing
- CO Sensing
5: 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 toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- Any fluid that exceeds 150 psig and has design temperature of over 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
6: How are refrigerant blends classified?
- Based on the oil used
- Based on best case Fractionation
- Blends don't have to be classified
- Based on worst case fractionation
7: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
8: 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
9: A High-Probability System
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
10: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
11: Relief valves are rated in
- gallons of water per hour
- pounds of air per hour
- gallons of water per minute
- pounds of air per minute
12: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
13: A relief valve discharge capacity is rated in
- temperature minus pounds of air per second divided by release rate squared
- PSIG
- PSIA
- Pounds of air per minute.
14: What refrigerant doesn't have to be classified?
- R-134A
- R-422A
- R-717
- R-718
15: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 100%
- 75%
- 90%
- 80%
16: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
17: R-11 belongs to Group
- A-1
- B-3
- B-1
- A-2
18: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- toxic and somewhat flammable
- non-toxic but highly flammable
19: 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
20: Ammonia belongs to Group
- A-1
- A-2
- B-1
- B-2
21: A class B1 refrigerant is considered
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic but non-flammable
- toxic and somewhat flammable
22: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 24
- 36
- 48
- 18
23: The certificate of inspection
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
24: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-2
- A-1
- B-2
25: Fusible plugs shall not be used with pressure vessels of
- 15 cubic feet or more
- 3 cubic feet or more
- 3 cubic feet or less
- 15 square feet or less