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

Download WRT Exam (2024/2025) | Actual Questions and Answers Latest Updated 2024/2025 (Graded A+) and more Exams Engineering in PDF only on Docsity! WRT Exam (2024/2025) | Actual Questions and Answers Latest Updated 2024/2025 (Graded A+) Infiltration Answer ✔✔When air comes into a structure through cracks or openings in a building, usually due to negative pressure. Exfiltration Answer ✔✔When air leaves a structure through cracks or openings in a building usually due to positive pressure. What is the significance of 30% moisture content? Answer ✔✔Can support wet rot in wood, as well as fiber saturation. To determine initial dehumidifier capacity recommendations, what must be known? Answer ✔✔Cubic feet, class of water, Dehumidifier type. What two documents determine if evaporation and dehumidification are complete? Answer ✔✔Moisture map & daily humidity record. What is HEPA? Answer ✔✔High Efficiency Particulate Air, 99.97% effective @ .3 microns What is the significance of 16% moisture content? Answer ✔✔Can support mold growth in wood. What are examples of Category 3 water? Answer ✔✔-Sewage - Ground surface water, rivers/streams - all flooding from sea water - wind-driven rain, weather related events - toilet backflows from beyond the P trap What is the S-500? Answer ✔✔Standard of Care for the Water Restoration Industry What does AHAM stand for? What are the test conditions? Answer ✔✔Association of Home Appliance Manufacturers Test Conditions are 80 degrees F / 60% relative humidity over a 24 hr. time period What are examples of Category 2 water? Answer ✔✔- flooding from dish washers/washing machines - broken aquariums - overflows from toilet on room side of P trap, some urine no feces What is the significance of 34 GPP? Answer ✔✔performance limit for low grain refrigerant dehumidifiers What are the principles of drying? Answer ✔✔-Remove excess (extraction) - Evaporation - Dehumidification - Temperature control (REDT) What is the definition of Vapor Pressure? Answer ✔✔pressure exerted by molecules of water vapor on surrounding surfaces. What are examples of Category 1 water? Answer ✔✔- falling rainwater - melting snow - flooding from tubs/sinks - broken water supply lines toilet bowls not containing contaminants What does EMC stand for? Answer ✔✔Equilibrium moisture content The factors affecting evaporation are...... Answer ✔✔- Permeance - Air Flow - Temperature - Humidity (PATH) What is the definition of permeance? Answer ✔✔measurement of breathability of a material allowing water to diffuse (move) through a material. What is the definition of conduction? Answer ✔✔Transmission of heat through a material. What does MDF stand for? Answer ✔✔Medium Density Fiberboard What is the definition of Dew Point Temperature? Answer ✔✔temperature at which air can hold no more moisture. 100% relative humidity What is the definition of Category 3 water? Answer ✔✔Grossly contaminated and can contain pathogenic, toxigenic, or harmful agents and can cause severe adverse reactions. Which principle of drying will most effectively reduce drying time? Answer ✔✔Extraction Upon what principle do desiccant dehumidifiers work? Answer ✔✔chemical attraction, or sorption using silica gel. What two tools are used to relieve carpet while disengaging it from tackstrip? Answer ✔✔Carpet awl and knee kicker What is the definition of sterilizer? Answer ✔✔used to eliminate or destroy microorganisms AND their spores. Effectively kills 99.9999% of target organism What is the definition of sanitizer? Answer ✔✔used to reduce but not eliminate microorganisms. Effectively reduces 99.9% of microorganisms What calculations should be used when installing air movers? Answer ✔✔- 1 for every affected room/area - 1 for every 50-70 sq ft of affected floors - 1 for every 100-150 sq ft of affected ceiling and walls - 1 for every inset and offset greater than 18" What does AFD stand for? Answer ✔✔Air filtration device 1 cubic foot holds how much water? Answer ✔✔7.48 gallons of water What is the significance of 20% moisture content? Answer ✔✔can support dry rot in wood What does ACH stand for? Answer ✔✔Air changes per hour How much does 1 gallon of water weigh? Answer ✔✔8.34 lbs What are the two types of extraction wands? Answer ✔✔- Light wand, best for direct glue down - Hard surface wand AKA vacuum squeegee What does OSB stand for? Answer ✔✔Oriented Strand Board What are the two types of drying techniques when using thermal energy? Answer ✔✔- Ambient Air Heating - Direct Heat Application What is the definition of a thermo hygrometer? Answer ✔✔device that at minimum measures temperature and relative humidity of the air. What does IEP stand for? Answer ✔✔Indoor Environmental Professional What does CFM stand for? Answer ✔✔cubic feet per minute What is the definition of Category 1 water? Answer ✔✔sanitary water source, does not pose substantial risk for dermal, ingestion, or inhalation exposure. What is the definition of sublimation? Answer ✔✔a chemical process where a solid turns into a gas without going through a liquid stage What is the definition of an open drying system? Answer ✔✔intentionally using outdoor air to lower indoor humidity, no use of mechanical dehumidification. What is the definition of a closed drying system? Answer ✔✔no use of exterior air, mechanical dehumidification only. What is the definition of disinfectant? Answer ✔✔inactivates pathogenic microorganisms, but not their spores. Effectively destroys 99.999% of target organisms, but NOT their spores.