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WRT EXAM Questions And Answers Latest Update 2023- 2024
1 cubic foot of water contains ______ gallons - Answer-7.
one gallon of water weighs _______ pounds - Answer-8.
The most critical course of action in restorative drying is to _____ ______ - Answer-Respond Quickly
All restorers should follow the standard of care for the water restoration profession developed by the restoration industry entitled the IICRC ________ - Answer-S
To help protect technicians from the many hazards associated with contaminated water losses, restorers need to have ready access to several items. These items protect for all ________ ________ to the body - Answer-potential exposures
Respiratory protection regulations state that the employer must provide
- ________ - Answer-medical eval
fit testing
training
as a minimum medical requirement, technicians performing water damage restoration services need medical consultation with their ________ ________ ________ ________ for appropriate immunizations
- Answer-Primary health care physician
The contract clearly states the agreement between the building owner and the restoration contractor. The form specifies who is responsible for payment and should be signed ________ work begins - Answer-Before
The technician's first responsibility when arriving at a water damaged sites is to identify, communicate and eliminate ________ ________ - Answer-safety hazards
The most common safety hazards associated with water damaged structures result in ________ and ________ - Answer-slips and falls
Federal regulations apply to the handling of ________ based paint and asbestos - Answer-lead
after safety concerns have been addressed and the initial water source has been stopped, the restorer must complete an evaluation of the water's migration through the structure. During this process, the restorer inspects all ________ ________ areas - Answer-potentially affected
the ultimate goal is to find the "edge" of water migration, which moves in a three-dimensional path throughout the structure. This is accomplished across carpeted surfaces using a ________ ________, and across most hard surfaces using a ________ (non-penetrating) moisture meter. - Answer-moisture sensor
non-invasive
Water from a clean source with no substantial risk of causing sickness or discomfort is said to be ________ ________ water - Answer-Category one
Water that has a significant degree of chemical, biological, and/or physical contamination and potential to cause sickness or discomfort is ________ ________ water - Answer-Category two
When water intrusion results from a grossly unsanitary source or carries ________ (disease causing) agents, it is said to be a Category 3 - Answer-pathogenic
Worker and occupant ________ and safety are the first priority on every sewage loss. Areas affected by Category 3 water intrusion are marked and posted as potentially hazardous - Answer-Health
- Improper removal of tack strip
4.Improper floating of carpet
Hygroscopic materials gain and lose moisture continually in an effort to ________ with the water content in the surrounding air mass. The more hygroscopic the material, the faster it will collect water vapor, and the easier it will suffer ________ damage - Answer-Equalize
Secondary
Cleaning procedures must be employed before the drying of a category 2 water loss can continue. At a minimum, affected ________ must be removed and disposed of, and carpet must be thoroughly cleaned using a hot water extraction method - Answer-underlay
Various cleaning and decontamination procedures must be used on category 3 water losses, including the removal of all ________ ________ materials affected by the water intrusion - Answer-highly porous
many building materials will absorb excess water vapor and suffer damage, especially when air is allowed to remain above ________% relative humidity - Answer-60%
Abide by local ________ and regulations when disposing extracted water. Waste water is best disposed of into a sanitary sewer - Answer-laws
The primary goal of the initial extraction of the affected ares is to contain further ________ of the water within the structure - Answer-migration
whenever carpet must be disengaged from the tackless strip, a ________ ________ and carpet awl must be used - Answer-knee kicker
the majority of cushion has a skin or mesh on the top side. the purpose of this skin is to ease ________ during installation; it is not a vapor barrier - Answer-Stretching
if the carpet is to be re-installed, technicians should avoid cutting carpet seams unless it is absolutely ________ - Answer-necessary
How many gallons of water are present in the basement that measures 13' X 20' where water is standing at a depth of 4' 5"? - Answer-8,596.016 Gallons
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 ________ phase. Poor extraction will significantly slow the drying process - Answer- Extraction
Every ________ ________ of standing water contains 7.48 gallons, and weighs ________ pounds - Answer-Cubic foot
There are three levels of biocidal activity, according to the Environmental Protection Agency (EPA) List from weakest to strongest
- ________ - Answer-Sanitizer
Disinfectant
Sterilizer
A thermo-hygrometer is used to monitor any air that can influence the ________ and/or ________ within a restorative drying environment - Answer-Temperature
Humidity
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 ________ or ________ - Answer- Dehumidification or Ventilation
________ occurs when liquid changes to a vapor. Occurs as energy is increased - Answer-Evaporation
As moisture evaporates from a wet material, the surface of the material becomes ________ because energy is released from the material - Answer-Cooler
________ occurs when vapor changes to a liquid. Occurs as energy is removed - Answer-Condensation
________ occurs when a solid changes to a vapor (without going through a liquid phase). - Answer- Sublimation
Freeze drying (sublimation) is typically used with valuable saturated books and documents. Books and documents saturated with clean water may be restorable if: ________ or ________ as quickly as possible - Answer-Frozen or Dried
When the air temperature increases, it can hold ________ water vapor - Answer-More
Evaporation will increase when
2. ________
- ________ - Answer-Wet materials are made warmer
when drier air is used
when air is moved more rapidly across the wet surface
If a material is not drying well, the most effective method of increasing evaporation is to ________ - Answer-Warm the material
One of the most effective methods of drying wet wood under hard surfaces is ________ - Answer- Heated airflow
The amount of moisture contained in an air sample, as compared to the maximum amount the air could hold at that temperature is called ________ - Answer-Relative Humidity
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
A. 60*F at 20% RH = ________ GPP
B. 80*F at 50% RH = ________ GPP
Which one has the lowest vapor pressure? - Answer-A. 16 GPP
B. 77 GPP
A
What is the surface temperature at which condensation would become a risk for air which is 80F at 60%? - Answer-64F
What is the temperature in degrees Fahrenheit if the humidity ration is 70 GPP, and the relative humidity is 60%? - Answer-72*F
Drying system that uses mechanical dehumidification only is called ________ - Answer-Closed drying system
Drying system that uses some outdoor air combined with mechanical dehumidification is called ________ - Answer-Combination drying system
If combination drying is determined appropriate, the following options (while keeping building security in mind) are available to the restorer
- ________ - Answer-1. Using ventilation fans in structure
- Using air movers to create pressure differentials and air exchange
- Opening windows
Elevating the temperature of the material is higher than the ________ temperature of the surrounding air, evaporation may occur - Answer-Dew point
A surface temperature of 30*F above dew point would have the fastest rate of ________ - Answer- Evaporation
Directly related to GPP and dew point, ________ is pressure of the water vapor on surrounding surfaces and objects, and is measured in inches of mercury. - Answer-Vapor Pressure
Movement of water vapor through a material is called ________ - Answer-Vapor diffusion
A measure of the ability for vapor to travel through a material is called ________ - Answer-Permeance
________ is the difference in GPP of the air entering and air leaving a dehumidifier - an indicator of dehumidifier performance - Answer-Grain Depression
________ is a chemical which reduces the amount of microorganisms on a surface, but does not eliminate all microbial life - Answer-Sanitizer
________ is a chemical which kills all forms of microbial life, but not the microbial spores. - Answer- Disinfectant
________ is a chemical which kills all forms of microbial life, including their spores - Answer-Sterilizer
The percent of moisture in wood when compared to an oven-dried sample is referred to as the ________ - Answer-Moisture content
________ is the Association of Home Appliance Manufacturers, Publishes test results for water removal of dehumidifiers at conditions of 80*F/60%RH over 24 hours - Answer-AHAM
Cubic feet of water x 7.48 = gallons - Answer-Gallons of Water equation
A x V x 24 / 1000 x $/kWh = $/day - Answer-Electrical cost formula
Amps x Volts x 3.4 = BTU/hr (heat energy) - Answer-BTUs of heat from equipment
Grain dep. x CFM / 71 = pints/day - Answer-Performance in Pints/day
Cubic ft x ACH / 60 = CFM - Answer-Air Filtration Device Calculation
MDF means ________ - Answer-Medium density fiberboard
AFD means ________ - Answer-Air filtration device
CFM means ________ - Answer-cubic feet per minute
ACH means ________ - Answer-Air changes per hour
AEH means ________ - Answer-Air exchanges per hour
Materials with a permeance ratings of less than ________ are referred to as vapor retarding materials (sometimes referred to as vapor barriers) - Answer-1.
Vapor ________ is the process by which water moves through permeable material - Answer-Diffusion
Where a negative pressure is created, air will move from neighboring spaces to "make up" for the air removed. This process is referred to as ________ - Answer-Infiltration
Strong ________ air pressure can cause combustion appliance exhaust to back draft into the structure - Answer-Negative
Crawlspaces are commonly unclean; when dried, they are held under a ________ air pressure relative to the ________ ________ of the house to prevent volatile organic compounds and particulate from entering the air space above - Answer-Negative
Living area
Positive air pressures are created by adding air to a space. Whenever air is added to a space, an inequality is created in air pressures. This inequality will result in the ________ of air into neighboring air spaces - Answer-exfiltration
Class ________ water intrusions involve the least amound of water absorption, with less that ________% of the surfaces being wet porous materials - Answer-
5%
Class ________ water intrusions involve a significant amount of water absorption, with more that 5% but less than ________% of area surfaces being wet porous materials - Answer-
40%
Class ________ water intrusions involve the most amount of water absorption, with more than ________% of area surfaces being wet porous materials - Answer-
40%
Wet materials present in a Class ________ water intrusion require a longer time to dry. Water has saturated deeply into the materials and is held or trapped as bound water. Low evaporation materials have ________ absorption to water - Answer-
Significant
Restorers must maintain their safety certified equipment properly. This includes replacing ________ that are damaged and replacing damaged inlet and outlet ________ - Answer-Cords
screens
Install ________ air mover for each ________ area before you calculate additional air movers for the square feet of surfaces and for room offsets - Answer-
affected
If a structure had affected air at 75* F at 25% RH, the most efficient type of dehumidifier to use would be a ________ - Answer-Desiccant
If a structure cannot be warmed to a temperature where LGRs would be effective, the most efficient type of dehumidifier to use would be a ________ - Answer-Desiccant
When using conventional refrigerant dehumidifiers in a "Class 2" water loss containing 15,000 cubic ft., the initial AHAM-rated capacity required is ________ - Answer-375 AHAM pint required initially
When using conventional refrigerant dehumidifiers that remove 125 pints at AHAM test conditions, the number installed initially on a Class 1 water loss with 25,000 cubic ft. is ________ ________ - Answer- 250 AHAM pints initially = 2 conventional refrigerant dehumidifiers
When using desiccant dehumidification in a Class 4 water loss in a 2,000 square ft. structure with a 9- foot ceiling height, the initial CFM required is ________ - Answer-900 CFM required initially
________ represents the "was-wood" material with the least engineering, and thus the most natural fiber bonding. - Answer-Plywood
Plywood is ________ to swelling and delamination due to its wood veneer assemblies which are glued under extreme pressure - Answer-Resistant
Wet particle board would normally be ________ and ________ - Answer-Removed and replaced
Plastic Laminate Flooring is made up of ________ and has a resin saturated appearance layer - Answer- MDF
Remove the vinyl (flooring) and discard it if the ________ is saturated and/or damaged; vinyl is a vapor barrier and time required to dry underlayment will be dramatically reduced if the vinyl is removed - Answer-Underlayment
Partial floating of carpet can be a way to achieve drying of all surfaces simultaneously and allows ________ dry air to have more contact with wet flooring - Answer-Warm
During the drying process, all of the gypsum's original strength is restored. In fact, the dried gypsum will normally be slightly ________ than before wetting - Answer-Stronger
In structures where the surface of the wall is covered with a non-________ surface it may be necessary to remove base molding drill holes and introduce air movement - Answer-Permeable
Airflow in the wall cavity increases the rate of ________ and allows the wall to dry from both inside and out - Answer-Evaporation
When ceilings are affected, drying procedures are very similar to wall drying. if the ceiling is sagging or otherwise damaged, wet drywall is drained, ________ and ________ - Answer-Remove and discard
Specific types of secondary damage associated with contents are typically:
- ________/________ - Answer-Swelling
Staining
Color transfer
delamination of surface/ finish material
When the presence of mold is suspected, it is important to communicate with all parties and use appropriate ________ measures - Answer-Protective
As with any contaminant, mold should be ________ or contained before any air movers are placed in the structure - Answer-Removed
Blowing air can spread mold spores from previous areas to the ________ rooms - Answer-Unaffected
Dry rot can occur when wood is visibly dry yet wetter than ________% moisture content - Answer-20%
Velocity of air blown by air movers is measured in _________ - Answer-FPM - Feet per minute
