Download IICRC WRT Exam: Comprehensive Questions and Answers for Water Damage Restoration and more Exams Water and Wastewater Engineering in PDF only on Docsity!
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This material loses most of its structural integrity when wet but regains its strength when dry: - โโโ Correct Answer > Gypsum wallboard or carpet A _____________ can be used to determine the extent of water migration in carpet and pad - โโโ Correct Answer > moisture sensor when air is holding the maximum amount of water vapor possible at a given temperature, the air is _____________ - โโโ Correct Answer
Saturated the temp of affected areas and the ____________ of wet materials significantly impacts the rate of evaporation - โโโ Correct Answer temp
_______________ do not detect moisture but can be a useful tool in identifying potentially wet materials - โโโ Correct Answer > Infrared Cameras or Thermal Imagine as moisture evaporates from materials the surface of that materials becomes _____________ - โโโ Correct Answer > cooler Thermo-hygrometer - โโโ Correct Answer > measures temperature and humidity Moisture levels of structural materials are measured and dry standards are determined using a _______________________ - โโโ Correct Answer > moisture meter To locate moisture beneath ceramic tile restorers should use a _____________ moisture meter - โโโ Correct Answer > non- invasive or non penetrating ________________ is always removed in both Cat 2 & 4 water damages
- โโโ Correct Answer > Carpet cushion or pad Damage particle board should be ___________ and _____________________ - โโโ Correct Answer > removed and replaced
As air temp increases, relative humidity ______________ - โโโ Correct Answer > decreases the ratio of the mass of water vapor to the mass of dry air in a given moist air sample, expressed in grains per pound of dry air is: - โโโ Correct Answer > humidity ratio (GPP) As humidity ratio increases (or decreases) another psychrometric property that also increases (or decreases) is: - โโโ Correct Answer
dew point and vapor pressure The pressure exerted by vapor molecules on surrounding surface is _________________ - โโโ Correct Answer > Vapor Pressure Water vapor pressure always seeks - โโโ Correct Answer > Equilibrium If vapor pressure in ambient air is lower than the vapor pressure in wet materials the outcome will be - โโโ Correct Answer > condensation Blowing air into wall cavities helps them dry by enhancing the rate of - โโโ Correct Answer > evaporation
the temp at which humidity in the air reaches saturation (100% RH) is ________ ________ _________ - โโโ Correct Answer > dew point temp Maintaining a surface temp above ____ ____ will allow evaporation to occur - โโโ Correct Answer > Dew Point ___________________________ is the process of changing liquid too a vapor - โโโ Correct Answer > evaporation the greater the temp of wet materials, the more ______ is available for evaporation to occur - โโโ Correct Answer > energy Adding ______ (heat) to materials promotes drying - โโโ Correct Answer > Energy Increasing the temp of wet materials or assemblies , which in turn increases the material's _________ ___________, can be done through many systems, including the application of direct heat. - โโโ Correct Answer > vapor pressure an _____ drying system utilizes outdoor air to reduce indoor humidity.
- โโโ Correct Answer > OPEN
Refrigerant dehumidifiers remove moisture from the air through the process of - โโโ Correct Answer > condensation Optimal performance range for refrigerants in between - โโโ Correct Answer > 70 - 90 degrees F A low grain refrigerant (LGR) dehumidifier reduces vapor pressure below a _____________ refrigerant. - โโโ Correct Answer > conventional Which type of dehumidifier produces the lowest vapor pressure air? - โโโ Correct Answer > Desiccant The most effective dehumidifier to use when drying a cold, wet crawlspace would be a _______ - โโโ Correct Answer > Desiccant When using an LGR dehu in a class 3 water intrusion containing 17, ft cubed, the initial water removal recommended is _______ PPD - โโโ Correct Answer > 425 PPD when using an LGR that removed 130 pints per day (PPD) at AHAM test conditions, the recommended number of dehus initially on a class 2 water intrusion with 35,000 ft cubed is _______ - โโโ Correct Answer > 6
When using a desiccant dehu that is rated to process 400 cfm, the initial recommended number on a class 4 water intrusion in a 5,000 sqft building with 8 foot ceiling height is ______ - โโโ Correct Answer > 1 A _________ is a diagram of the affected area showing extent of water migration. - โโโ Correct Answer > Moisture Map Circulating air where contamination is present can increase the likelihood of contaminating ______________ areas. - โโโ Correct Answer > Unaffected Before applying biocides, restorers should advise customers to ________ the structure for the period of time during and after application. - โโโ Correct Answer > vacate Products used to reduce, but not necessarily eliminate, microorganisms to levels considered safe as determined by public health codes or regulations: - โโโ Correct Answer > Sanitizers Products that kill or inactivate at least 99% of disease-producing (pathogenic) microorganisms on inanimate objects but not necessarily their spores: - โโโ Correct Answer > Disinfectants
Water damage restoration work never begins without a signed - โโโ Correct Answer > work authorization To minimize damage to building materials and contents, restorers should perform _______________________________________ as part of the preliminary inspection. - โโโ Correct Answer > Loss mitigation services When pre-existing damage is discovered, technicians should ___________________ and ____________________ to all materially interested parties. - โโโ Correct Answer > document and communicate Technicians should always use a _______________________ and a _______________________ to disengage carpet from the tackless strip.
- โโโ Correct Answer > knee kicked and carpet awl The primary reasons for carpet delimitations are: - โโโ Correct Answer > Damage due to water Folding of wet carpet during pad removal Over aggressive extraction Dragging heavy items Alot of foot traffic Improper install
Pet urine Secondary damage is most prevalent in ___________________ materials. - โโโ Correct Answer > Hygroscopic Above __________% RH supports microbial growth and secondary damage can occur in hygroscopic materials. - โโโ Correct Answer > 60% Category _____ water originated from a sanitary source and does not pose substantial risk to humans. - โโโ Correct Answer > 1 Category ____ water contains significant contamination and has the potential to cause discomfort or sickness if contacted or consumed by humans - โโโ Correct Answer > 2 In a Category 3 water intrusion with elevated risk situations, restorers should consider using an ______________________________________ to assist in a remediation assessment. - โโโ Correct Answer > Indoor environmental Professional (IEP) When working contaminated environments technicians should erect ________________________, done appropriate __________, and install ______________________. - โโโ Correct Answer > Containment, PPE, Air filtration device (AFD)
Gypsum board that is saturated and sagging should safely ___________ and _________. - โโโ Correct Answer > Drained and removed When inspecting a water damaged structure, techs should inspect all ___________________ areas - โโโ Correct Answer > potentially affected Class ___ water losses contain the least amount of water absorption and evaporation load where wet, porous materials represent less than 5% of the combined floor, wall and ceiling surface area in the space - โโโ Correct Answer > 1 Class ____ water losses contain a significant amount of water absorption and evaporation load where wet, porous materials represent 5%-40% of the combined, floor, wall and ceiling surface area in the space - โโโ Correct Answer > 2 The greatest amount of water absorption and evaporation load where wet, porous materials represent more than 40% of the combined wall, floor, and ceiling surface areas and where low evaporation materials or assemblies have absorbed minimal moisture is a Class___________ - โโโ Correct Answer > 3 Water intrusion that involves a significant amount of water absorption bound within low evaporation materials and may require longer drying times is a class ____ - โโโ Correct Answer > 4
moisture detection equipment should be used to measure and document ___________________ and _______________________________. - โโโ Correct Answer > Moisture content and relative humidity readings. when using a desiccant dehu that is rated to process 400 CFM the initial recommended number on a class 4 water loss in a 5,000 sq ft building with 8 ft ceiling height is - โโโ Correct Answer > 5 a 12 ft x 14 ft room with 4 inches of water contains approx. ______ gallons of water. - โโโ Correct Answer > 418 The number of gallons present in a water loss that is 3ft 9 inches in depth in a 22 ft x 30' basement is - โโโ Correct Answer > 18, What is the dew point temp when the humidity ratio % is 132 GPP? - โโโ Correct Answer > 75 degrees F On a drying project, the indoor conditions are 80% F and 70% RH. What temp is needed to brin the RH to 35%? - โโโ Correct Answer > 102 - 103 degrees F
