IICRC WATER DAMAGE RESTORATION
TECHNICIAN (WRT) ADVANCED
CERTIFICATION
1. According to the ANSI/IICRC S500, what is the specific definition of Category 3 water?
A. Water that is highly contaminated and could contain pathogenic, toxigenic, or other
harmful agents.
B. Water from a broken pipe that does not pose a substantial risk to humans.
C. Water that contains significant contamination and has the potential to cause discomfort
or sickness.
D. Water originating from a source that does not pose substantial harm to humans, such as
a water supply line.
Answer: A
Conceptual Explanation: Category 3 water is grossly contaminated and can contain
pathogens, silt, organic matter, and toxic substances. Examples include sewage and rising
floodwaters.
,2. Which of the following describes the point at which air is 100% saturated and can no longer
hold moisture?
A. Dew Point
B. Relative Humidity
C. Humidity Ratio
D. Vapor Pressure
Answer: A
Conceptual Explanation: The dew point is the temperature at which the air becomes
saturated and water vapor begins to condense into liquid water.
3. In the context of psychrometrics, what does Grains Per Pound (GPP) measure?
A. The pressure exerted by water molecules on the surrounding air.
B. The ratio of water vapor in the air to the maximum amount the air could hold.
C. The weight of the water vapor in one pound of dry air.
D. The weight of liquid water absorbed by a porous material.
Answer: C
Conceptual Explanation: Grains Per Pound (GPP) is a measure of the humidity ratio,
representing the weight of water vapor in one pound of dry air.
, 4. A conventional refrigerant dehumidifier typically loses its effectiveness when the Grains
Per Pound (GPP) drops below:
A. 34 GPP
B. 45 GPP
C. 70 GPP
D. 55 GPP
Answer: D
Conceptual Explanation: Conventional refrigerant dehumidifiers generally become
inefficient once the humidity ratio reaches approximately 55-60 GPP.
5. What is the primary mechanism by which a desiccant dehumidifier removes moisture from
the air?
A. Lowering the air temperature below the dew point.
B. Increasing the air temperature to facilitate evaporation.
C. Compressing the air to force moisture out.
D. Adsorption of water molecules onto a chemical substance like silica gel.
Answer: D
Conceptual Explanation: Desiccants use chemical attraction (adsorption) to pull moisture
out of the air, allowing them to reach much lower GPP levels than refrigerants.
TECHNICIAN (WRT) ADVANCED
CERTIFICATION
1. According to the ANSI/IICRC S500, what is the specific definition of Category 3 water?
A. Water that is highly contaminated and could contain pathogenic, toxigenic, or other
harmful agents.
B. Water from a broken pipe that does not pose a substantial risk to humans.
C. Water that contains significant contamination and has the potential to cause discomfort
or sickness.
D. Water originating from a source that does not pose substantial harm to humans, such as
a water supply line.
Answer: A
Conceptual Explanation: Category 3 water is grossly contaminated and can contain
pathogens, silt, organic matter, and toxic substances. Examples include sewage and rising
floodwaters.
,2. Which of the following describes the point at which air is 100% saturated and can no longer
hold moisture?
A. Dew Point
B. Relative Humidity
C. Humidity Ratio
D. Vapor Pressure
Answer: A
Conceptual Explanation: The dew point is the temperature at which the air becomes
saturated and water vapor begins to condense into liquid water.
3. In the context of psychrometrics, what does Grains Per Pound (GPP) measure?
A. The pressure exerted by water molecules on the surrounding air.
B. The ratio of water vapor in the air to the maximum amount the air could hold.
C. The weight of the water vapor in one pound of dry air.
D. The weight of liquid water absorbed by a porous material.
Answer: C
Conceptual Explanation: Grains Per Pound (GPP) is a measure of the humidity ratio,
representing the weight of water vapor in one pound of dry air.
, 4. A conventional refrigerant dehumidifier typically loses its effectiveness when the Grains
Per Pound (GPP) drops below:
A. 34 GPP
B. 45 GPP
C. 70 GPP
D. 55 GPP
Answer: D
Conceptual Explanation: Conventional refrigerant dehumidifiers generally become
inefficient once the humidity ratio reaches approximately 55-60 GPP.
5. What is the primary mechanism by which a desiccant dehumidifier removes moisture from
the air?
A. Lowering the air temperature below the dew point.
B. Increasing the air temperature to facilitate evaporation.
C. Compressing the air to force moisture out.
D. Adsorption of water molecules onto a chemical substance like silica gel.
Answer: D
Conceptual Explanation: Desiccants use chemical attraction (adsorption) to pull moisture
out of the air, allowing them to reach much lower GPP levels than refrigerants.
