Topics: All categories in the pool
1: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
2: A restaurant is classified as a
- large mercantile occupancy
- public assembly occupancy
- commercial occupancy
- mixed occupancy
3: Trichlorofluoromethane is the name of what refrigerant?
- R-502
- R-12
- R-11
- R-113
4: The density of a gas refers to
- cubic feet per pound
- pounds per square foot
- pounds per cubic foot
- pounds per absolute pressure
5: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
6: Ammonia vaporization takes place at what temperature?
- -110F
- -460F
- -28F
- -32F
7: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 90%
- 99%
- 80%
- 75%
8: Which is the lowest vacuum?
- 1,000 Microns
- 5 psig
- 10 psia
- 5" hg
9: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Copper
- Magnesium
- Aluminum
10: If the power element on an expansion valve should lose its charge, the valve would
- Stay open
- Close
- Over feed
- Under feed
11: Color is important in oil because
- can tell us something about the refining of oil
- it indicates the viscoisty.
- it makes sight glasses easy to read
- allows you to see into crankcase
12: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 24
- 15
- 18
13: 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)
- illegal occupancy
- public assembly occupancy
- commercial occupancy
- institutional occupancy
14: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- CFC-11
- Lithium bromide
- HCFC-123
15: The Board of Boilers adopts by reference
- the 1997 ANSI/ASHRAE Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- MSCA Code
- Montreal Protocol Safety Code
16: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 500 lbs
- 660 lbs
- 330 lbs
17: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the occupied space
18: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- Rust can form
- The Li-Br solution will become more concentrated
- The Li-Br solution will become more diluted
- System operating pressure will drop
19: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
20: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- public assembly occupancy.
- business occupancy
- mercantile occupancy
- commercial occupancy
21: Heat transferred by conduction from one body to another is done
- via liquids
- via solids
- via radiation
- via heat rays
22: Which of the following is an example of an azeotropic refrigerant?
- R-134A
- R-404A
- R-410A
- R-500
23: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
24: one BTU equals
- 3.41 hp
- 31.4 hp
- 12,000 hp
- Pi
25: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Circuit Breaker
- Relief valve
- T&P device
- Temperature limiter device