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IICRC WRT 2024 with 100 Test Questions and Answers with rationales
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IICRC WRT 2024 with 100 Test Questions and Answers with rationales
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IICRC WRT 2024 with 100 Test Questions andAnswers with rationales
______ is defined as the amount of moisture contained in an air sample as compared to
the maximum amount the air could hold at the temperature. - relative humidity
when the air temperature increases , it can hold ____ water vapor - more
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 - humidity ratio
which of these surface temperatures would prompt the most rapid evaporations?
60 degrees
70 degrees
80 degrees - 80
if a material is not drying well what would be the most effective method of increasing
evaporation? - warm the material
one of the most effective methods of drying wet wood under hard surfaces is - heated
airflow.
Use of Psychometrics chart to complete the following calculation
80 F at 60% RH
53 F at 80% RH - 91 GPP
48 GPP
* which of the two conditions has the lowest vapor pressure?
53 F at 80% RH = 48 GPP
*what is the surface temperature at which condensation would become a risk for air
which is 80 F at 60%
102 F (dew point)
what is the temperature in degrees F if the humidity ratio is 70 GPP and the relative
humidity is 60% - 72 F
____ is the temperature at which air becomes saturated with moisture and can hold no
more water vapor - dew point
, when air is cooled its capacity for water vapor is reduced, eventually If temperature is
cooled enough, the relative humidity will reach ____% or saturation. when this occurs
the air has reached its ___ point temperature. - 100%
dew point
if surfaces are _____ then the dew point of the surrounding air, water will condense on
those surfaces and possibly cause secondary damage. if surfaces are _____ then the
dew point of the surrounding air, evaporation can occur. - cooler
warmer
______is the force exerted by a gas (vapor molecules) on the surrounding environment.
- vapor pressure
vapor pressure, dew point, and humidity ratio (GPP) are directly related to each other.
when one increases the other two _____. when one decreases the other two ______. -
increase
decrease
water vapor pressure is the force that drives higher convention of humidity from one
space to another in an attempt to seek ____ with lower concentration of water vapor. -
equilibrium
the ability for water vapor to diffuse through a solid material is expressed as the
materials _____ - permeance
drying systems (provide name and brief descriptions of each) - open: intentional using
outdoor air
closed: using mechanical dehumidification only
combination: using outdoor air combo with mechanical dehumidification
open , closed or combination - how to decide? - is the outside air humidity ratio lower?
no : use closed drying
yes: is the outside air warmer than 70 F?
no: may use combination drying
yes: is the security, weather, customer preference
agreeable to open drying?
no: use closed drying
yes: can use open drying
if open drying is determined appropriate, the following options (while keeping building
security in mind) are available to the restorer - - using ventilation
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