WRT Exam (2024/2025) | Actual Questions and Answers Latest Updated 2024/2025 (Graded A+), Exams of Biology

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WRT Exam (2024/2025) | Actual Questions and Answers Latest Updated 2024/2025 (Graded A+) The most critical course of action in restorative drying is to Answer ✔✔respond quickly Respiratory protection regulations state that the employer must provide Answer ✔✔Medical evaluations, Fit Testing (ensuring respirator fits properly), Testing The technician's first responsibility when arriving at a water damage site is to identify, communicate and eliminate Answer ✔✔safety hazards Federal regulations apply to the handling of Answer ✔✔lead-based paint and asbestos Water from a clean source with no substantial risk of causing sickness or discomfort is said to be Answer ✔✔category 1 water Water that has a significant degree of chemical, biological and/ or physical contamination is Answer ✔✔category 2 A thermo-hygrometer is used to monitor any air that can influence the temperature Answer ✔✔and /or humidity within a restorative drying environment When water intrusion results from a grossly unsanitary source or carries Answer ✔✔pathogenic (disease causing) agents, it is said to be Category 3 The technician's first responsibility when arriving at a water damage site is to identify, communicate and eliminate Answer ✔✔Safety hazards. There are a number of causes for carpet delamination - many of them related to Answer ✔✔improper restoration activities Pre-existing conditions should be identified, documented and communicated to all Answer ✔✔materially interested parties during the initial inspection Losses where regulated or hazardous materials have contaminated the structure are considered Answer ✔✔special situations Whenever carpet must be disengaged from the tackless strip, a Answer ✔✔knee kicker and carpet awl must be used The primary goal of the initial extraction of the affected area is to contain further Answer ✔✔migration of the water within the structure The majority of cushion has a skin or mesh on the top side. The purpose of this skin is to ease Answer ✔✔carpet stretching during installation; it is not a vapor barrier. If carpet is to be re-installed, technicians should avoid cutting carpet seams unless it is absolutely Answer ✔✔necessary L x W x H Answer ✔✔Basement 30x25 x 6'9" depth of water. 9inches divide by 12=. Then multiply all . 6.75 Various cleaning and decontamination procedures must be used on category 3 water losses, including the removal of all Answer ✔✔highly porous materials affected by the water intrusion Every cubic foot of standing water contains Answer ✔✔7.48 gallons Each gallon of water weighs Answer ✔✔8.34 pounds Abide by local Answer ✔✔laws and regulations when disposing extracted water. Waste water is best disposed of into a sanitary sewer. Typical causes of carpet delamination are Answer ✔✔Folding or stretching of carpet when wet, overly aggressive extraction, improperly specified carpet underlay, improper installation, improper removal from tack strip, improper floating of carpet, excessive wear, Pet damage. Hygroscopic materials gain and lose moisture continually in an effort to Answer ✔✔equalize with the water content in the surrounding air mass When water intrusion results in water running through wall cavities, inspection access holes are used to ensure that blown-in insulation has not compacted and lost its Answer ✔✔R-value The more hygroscopic the material, the faster it will collect water vapor, and the easier it will suffer Answer ✔✔secondary damage Cleaning procedures must be employed before the drawing of a category 2 water loss can continue. At a minimum, affected Answer ✔✔carpet underlay or pad must be removed and disposed of, and carpet must be thoroughly cleaned using a hot water extraction method. The most effective way to speed the drying process is to remove as much of the water in a liquid state as possible during the Answer ✔✔extraction face. Poor extraction will significantly slow the drying process There are three levels of biocidal activity, according to the Environmental Protection Agency EPA Answer ✔✔Sanitizer, disinfectant, sterilizer Sanitizer Answer ✔✔Lowest level of biocidal activity. I cleaning treatment designed to reduce the number of pathogenic microorganisms to a safe level Disinfectant Answer ✔✔A product designed to destroy or inactivate microorganisms but not necessarily their spores Sterilizer Answer ✔✔A product designed to destroy or eliminate all forms of microorganisms. Fungi , bacteria, viruses. Whenever a chemical antimicrobial or biocide is used, restores must follow the label Answer ✔✔directions explicitly Most antimicrobials require that the area of application be vacated by Answer ✔✔occupants and pets during application and for a period of time after application The numerical value from a moisture meter can be documented and Answer ✔✔used to monitor progress The amount of moisture absorbed by semi-porous structural materials is measured most accurately with a Answer ✔✔moisture meter, Not a moisture sensor Because of the noninvasive nature and quick surveying capabilities, non-invasive meters are the most effective tools for locating abnormal moisture behind and beneath finishing materials such as Answer ✔✔ceramic tile and vinyl floor coverings After physically removing excess water, the time required to dry wet materials is influenced most by the Answer ✔✔rate of evaporation As the water is rapidly evaporated, the water vapor is removed by Answer ✔✔dehumidification or ventilation evaporation Answer ✔✔Occurs when a liquid changes to a vapor. Occurs as energy is increased. That's voiced your evaporates from a wet material, the surface of the material becomes Answer ✔✔cooler because energy is released from the material Condensation Answer ✔✔Occurs when vapor changes to a liquid. Occurs as energy is removed Sublimation Answer ✔✔Occurs when a solid changes to a vapor (without going through a liquid phase). Freeze drying (sublimation) is typically used with valuable saturated books and documents. Books and documents saturated with clean water may be restored if Answer ✔✔Frozen or dried as quickly as possible Evaporation Will increase when Answer ✔✔Wet materials made warm, drier air is used, air it's more rapidly across a wet surface Relative humidity Answer ✔✔Is defined as the amount of moisture contained in the air, as compared to the maximum amount the air could hold at the temperature In the restorative drying industry the weight measurement used to measure water vapor in air is grains per pound of air, abbreviated as GPP. This is called Answer ✔✔Humidity ratio Dew point Answer ✔✔Is the temperature at which air becomes saturated with moisture vapor, or can hold no more water vapor When air is cooled Answer ✔✔it's capacity for water vapor is reduced If air is cooled enough, the relative humidity will reach Answer ✔✔100% or saturation. When air has reached saturation the air has reached its Answer ✔✔Dew point temperature If surfaces are cooler Answer ✔✔Than the dew point of the surrounding air, water will condense on those surfaces and possibly cause secondary damage If surfaces are warmer Answer ✔✔Than the dew point of the surrounding air, evaporation can occur Vapor pressure Answer ✔✔Is the force exerted by a liquid or gas on the surrounding environment The greater the weight of water vapor, the greater the vapor pressure there for vapor pressure, dewpoint and humidity ratio GPP are Answer ✔✔directly related to each other Class 3 water intrusions Answer ✔✔Involve entire areas of carpet and underlay that are wet, together with wet walls, structure and insulation (moisture wicking up or water coming down from above) Class 4 water intrusions Answer ✔✔Result in a specialty drying situation.water has saturated deeply into the materials and is held as bound water.commonly includes hardwood, plaster, brick, deeply saturated concrete, deeply saturated ground soil and stone Restorers must maintain their safety certified equipment properly. This includes replacing Answer ✔✔Cords that are damaged and replacing damaged inlet and outlet screens Dehumidification Answer ✔✔Reduces the moisture content of the air A balanced drying system is achieved when the rate of dehumidification is greater than or equal to the rate of Answer ✔✔Evaporation Refrigerant dehumidifiers remove water from the air through the process of Answer ✔✔Condensation Refrigerant dehumidifiers Answer ✔✔Are more efficient in higher humidity conditions. They work best between 70° and 90°F Air filtration devices AFDs Answer ✔✔Are needed in water restoration work whenever high levels of particulates are being added to the air LGRs Will continue to remove significant water vapor down to Answer ✔✔34 GPP never less than 34 GPP. desiccant Conventional refrigerant dehumidifiers Answer ✔✔Under normal temperatures are effective in reducing high humidity to a normal level/approximately 40% RH, or about 55 GPP Because desiccant dehumidifier's do not use condensation to remove water, they are not limited by dew point temperatures, therefore they produce the lowest Answer ✔✔Vapor pressure of any dehumidifier If a structured cannot be warmed to a temperature were LGRs would be effective the most efficient type of dehumidifier to use would be Answer ✔✔Desiccant To determine how many dehumidifiers to place Answer ✔✔The term of the cubic feet affected or volume of air to be dehumidified by multiplying the areas length x width x height. Then look at chart for class #. Then look how many pints the ? Tells u that dehu gets out divide it by that. Dehumidifiers (AHAM)association of home appliance manufacturers ratings are measured in Answer ✔✔Pints of water remove that 80°F, 60% Rh for 24 hours Once it has been determined that the floor can be salvaged by in-place drying , the first step is to determine Answer ✔✔A dry goal for the hardwood and subfloor The best way to prevent odors and retard microbial growth in a wet structure is to ensure that all materials are dried Answer ✔✔Thoroughly and rapidly As mold grows, it can produce a toxic chemical substance. All mold related toxins are referred to as Answer ✔✔Microtoxyns When the presence of mold is suspected, it is important to communicate with all parties and use Answer ✔✔Appropriate protective measures As with any contaminants, mold should be removed or contained before any air movers are placed in the structure, blowing air can spread mold spores Answer ✔✔And contaminate with the entire area Dry rot (wood rot) Answer ✔✔Can occur when wood is visibly dry yet wetter than 20% moisture content Determine how wet items are Answer ✔✔Monitor daily in most circumstances, use the same meters in the same locations each day, determine if wet items are drying, determine if affected items are dry Cupping Answer ✔✔Will generally be the first indication of abnormal moisture levels in hardwood flooring as the bottom and sides of the board absorbs moisture Cupping in hardwood Answer ✔✔It's not permanent damage, and should be dried in most cases Restorers must use a third-party (IEP) in situations that involves severe public health issues Answer ✔✔High risk occupants living or working in the structure, microbial contamination that can affect worker or occupant health