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

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WRT & ASD Exam ( 2024 /2025) | Actual Questions and Answers Latest

Updated 2024/2025 (Graded A+)

Psychrometry Answer ✔✔Study of the relationship between air, humidity, and temperature and their effects on materials and comfort levels Evaporation Answer ✔✔Process of changing a liquid to a vapor Dehumidification Answer ✔✔Reducing moisture content in the air Dry Bulb Temperature Answer ✔✔Temperature degree registered by a thermometer Dew Point Answer ✔✔The point at which humidity in the air reaches saturation or 100 Percent RH Saturation Point Answer ✔✔Point at which air or materials can absorb no more moisture, drying stops, and air temperature reached dew point Condensation Answer ✔✔Conversion of water from vapor state back to liquid state Relative Humidity (RH) Answer ✔✔The amount of moisture in a given volume of air, expressed as a percentage, at a given temperature Infiltration Answer ✔✔Migration of air into an area from an outside area due to high VP differential Balanced Drying Answer ✔✔Ideal drying situation in which the rate of evaporation is equal to or slightly less than the rate of dehumidification or ventilation GPP Answer ✔✔Unit used to measure humidity ratio

7000 Grains of water vapor Answer ✔✔Equals 1 pound of water 14 cubic feet of dry air Answer ✔✔Equals 1 pound Humidity Ratio Answer ✔✔The weight of suspended moisture in air expressed in GPP Hygroscopic Answer ✔✔Material that readily absorbs and retains moisture or water vapor from air in an attempt to reach equilibrium Moisture Content (MC) Answer ✔✔Weight or percentage of moisture in materials, as compared to the weight of oven dried , like material Permeance Answer ✔✔A measure of water flow through materials of specific thickness Moisture Gradient Answer ✔✔Different levels of moisture content within a wood material Vapor Pressure Answer ✔✔Pressure on surfaces exerted by substances in a gaseous state directly related to dehumidification Vapor Barrier Answer ✔✔Permeance Factor of 1 or less Grain Depression Answer ✔✔Reduction of humidity ratio as noted in difference from ambient air to output on dehumidifier HAT Answer ✔✔Humidity, Airflow, Temperature Control Directly Related Answer ✔✔Vapor Pressure (VP), Humidity Ratio, and Dew Point Inversely Related Answer ✔✔Temperature and RH

Open Drying Answer ✔✔Intentionally exchanging inddor with outdoor air without using dehu's Closed Drying Answer ✔✔Use of mechanical dehu's Heat Drying Systems Answer ✔✔Directed Heat and Ambient Heat Applications increase the rate of evaporation by increasing the surface temperature of wet materials 40 Percent Answer ✔✔RH to attempt to achieve after initial 24 hours of drying 60 Percent Answer ✔✔RH hygroscopic materials start to readily take on humidity and growth begins 14 Answer ✔✔Cubic feet in a pound of dry air 7000 Answer ✔✔Grains in a pound of dry air 55 Answer ✔✔GPP where conventional dehu's start to lose efficiency 34 Answer ✔✔GPP where LGR dehu's start to lose efficiency 70 - 90 Degrees Answer ✔✔Temp at which refrigerant dehu's have best performance 30 percent Answer ✔✔RH where LGR dehu's start to lose efficiency 12,000 Answer ✔✔Btu removal action per ton of air conditioning per hour 10 - 16 feet Answer ✔✔distance recommended per foot with most airmovers for potentially effective evaporation

50 - 60 feet Answer ✔✔Alternative per square foot recommendation for airmover placement 7.48 Answer ✔✔Gallons per cubic foot of water depth 3 feet Answer ✔✔Distance of hardwood floor panels pulling from any direction as maximum distance set up for injectidry system 100 percent Answer ✔✔RH at saturation / dew point 16 percent Answer ✔✔Non-rotting fungi growth ON wood Shall Answer ✔✔Means that the practice or procedure is mandatory Should Answer ✔✔Means the practice or procedure is a component of the accepted "standard of care" to be followed Recommended Answer ✔✔Means the practice or procedure is advised or suggested but is not a component of the the accepted "standard of care" to be followed Class 1 Answer ✔✔Water intrusion with the least amount of water, absorption and evaporation load representing less than 5 percent of the affected area Class 2 Answer ✔✔Water intrusion with a large amount of water, absorption, and evaporation load representing 5-40 percent of the affected area Class 3 Answer ✔✔Water intrusion with the greatest amount of water, absorption, and evaporation load representing more than 40 percent of the affected area Class 4 Answer ✔✔Water intrusion with deeply held or bound water resulting in a low potential rate of evaporation that involves specialty drying situations

Category 1 Answer ✔✔Source of water intrusion originates from a sanitary water source Category 2 Answer ✔✔Source of water intrusion originates from a contaminated water source and has the potential to cause discomfort or sickness Category 3 Answer ✔✔Source of water intrusion originates from a grossly contaminated source and includes toxins/pathogens Principles of Drying Answer ✔✔Remove Excess (Extraction), Evaporation, Dehumidification, Temperature Control SCDS Answer ✔✔Structural Cavity Drying Systems Types of SCDS Answer ✔✔Vented-ducted and injected Types of Floor Drying Systems Answer ✔✔Vented, Injected, and Air Blanketed Types of Air Filtration Devices (AFDs) Answer ✔✔Negative Air Machines and Air Scrubbers 10 percent Answer ✔✔RH where desiccants lose efficiency 10 - 15 Answer ✔✔GPP Level where desiccants lose efficiency AHAM rating Answer ✔✔Pints removed at 80 degrees / 60 percent RH in 24 hours Desiccants Answer ✔✔Most efficient with incoming air from coolest/driest air possible Desiccants Answer ✔✔Dehu capable of creating greatest pressure differentials

Amps Answer ✔✔The amount of current flowing in a circuit Volts Answer ✔✔The force of electricity flow in a circuit Watts Answer ✔✔The amount of electricity an electrical device uses when operating British Thermal Units (Btu) Answer ✔✔Heat generated by electrical device Formula for Btu/hour Answer ✔✔Amps * Volts * 3. Moisture Sensor Answer ✔✔Inspection equipment that senses moisture in materials over 17 percent MC that helps determine the perimeter but can not determine which layer is wet or when dry Thermo-hygrometer Answer ✔✔Inspection equipment that determines temperature / RH in all required atmospheric areas of inspection that helps determine open or closed drying systems and further dehu recommendations Moisture Meter Answer ✔✔Inspection equipment both invasive and non-invasive that determines the moisture content and when dry standards are met High Efficiency Particulate Air (HEPA) Answer ✔✔Filter that captures 99.97 percent of particulates at. micron size Delamination Answer ✔✔Separation of primary from secondary backing in carpets 68 - 86 Degrees Answer ✔✔Temperature most prolific for growth Indoor Environmental Professional (IEP) Answer ✔✔Specialized expert such as an Industrial Hygienist

Rapid Response and Drying structural materials rapidly Answer ✔✔Most critical actions to shorten the drying time and retard microbial growth Moisture Map and Daily Humidity Record Answer ✔✔Two Documents used to determine if evaporation and dehumidification process is adequate Extraction Tools Answer ✔✔Wands, Stationary tools, Weighted tools, Self Propelled Tools [ (LWHeight in inches deep) / 12 ] * 7.48 Answer ✔✔Formula for calculating amount of standing water Sterilize Answer ✔✔to destroy or eliminate all forms of microbial life and all forms of bacteria and their spores. 100 percent effective. Disinfect Answer ✔✔To kill or inactivate at least 99.9 percent of disease producing microoganisms, but not necessarily their spores Sanitize Answer ✔✔To reduce the number of pathogenic microorganisms to a safe level as judged by public health agencies ACM Answer ✔✔Asbestos Containing Material MIP Answer ✔✔Material Interested Parties