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A proprietary fire alarm system is a type of fire alarm system that transmits signals that are permanently recorded at a constantly attended supervising station located either at the protected premises or at another location of the property owner. A proprietary fire alarm system is owned and operated by the property owner or the owner’s agent. A proprietary fire alarm system is intended to provide fire alarm service to a single property or a campus of related properties.References:

• NFPA 72: National Fire Alarm and Signaling Code, 2019 Edition, Section 3.3.105.11
• Fire Protection Handbook, 20th Edition, Volume 1, Chapter 7, Section 7.2.1.12

Zebra mussel

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The correct answer is B. Zebra mussel pipe obstructions are largely concentrated around the Great Lakes and Mississippi River areas. Zebra mussels are an invasive species that originated from Eurasia and were introduced to North America in the late 1980s through the ballast water of ships. They have since spread to many freshwater lakes and rivers, especially in the Midwest and Northeast regions of the United States and Canada. Zebra mussels can attach themselves to hard surfaces, such as pipes, pumps, valves, and filters, and form dense colonies that reduce or block the water flow. This can cause serious problems for industries, utilities, and municipalities that rely on water intake or delivery systems.Zebra mussels can also damage aquatic ecosystems, infrastructure, and recreation by competing with native species, altering water quality, and fouling boats and equipment12345

Fuel oil is a liquid fuel derived from petroleum that can be used in grain dryers as an alternative to natural gas or propane. Fuel oil is typically classified into six grades, from No. 1 to No. 6, based on their viscosity, sulfur content, and boiling point. No. 2 fuel oil is the most common grade used for heating purposes, including grain drying. Fuel oil has a higher energy density and lower cost than natural gas or propane, but it also produces more emissions and requires more storage and handling12

References:

• Best Fuel for Grain Drying Equipment - Crown Oil1
• Preventing Grain Dryer Fires: Tips For Startup, Cleaning, Shutdown2

The correct answer is A. Type I construction consists of structural members of approved noncombustible or limited combustible materials with specified fire resistance ratings for exterior bearing walls of 3 or 4 hours. This is the highest level of fire resistance among the five types of construction defined by NFPA 220: Standard for Types of Building Construction.Type I construction is typically used for high-rise buildings made of concrete and protected steel12

The types of overspray collectors associated with spray booths can be categorized into venturi scrubbers, waterfall scrubbers, dry filter, and cartridge filter. Venturi scrubbers use a high-velocity water spray to capture the overspray particles in a turbulent zone. Waterfall scrubbers use a curtain of water flowing over a perforated plate to wash down the overspray. Dry filter collectors use a series of filters, such as paper, fiberglass, or synthetic media, to trap the overspray. Cartridge filter collectors use pleated cartridges with high surface area and efficiency to capture the overspray. These collectors also have a self-cleaning mechanism that uses compressed air to dislodge the overspray from the cartridges.

References:Spray Booth Filters: Types and Selection;Spray Booths and Paint Finishing Operations;Spray Booth Filters: Types and Selection;Spray Booth Filters: Types and Selection;Spray Booth Filters: Types and Selection