IICRC WRT PROFESSIONAL
CERTIFICATION PRACTICE EXAM
QUESTIONS AND ANSWERS
1. Which category of water originates from a source that does not pose a substantial risk
from dermal, ingestion, or inhalation exposure but may become contaminated if it contacts
other surfaces?
A. Category 2
B. Category 3
C. Special Situations
D. Category 1
Answer: D
Conceptual Explanation: Category 1 water originates from a sanitary water source and
does not pose substantial risk unless it becomes contaminated by secondary factors.
2. In a water restoration project, what is the ‘Dry Standard’?
A. The moisture content of the material at the time of the flood
B. The humidity level required by the insurance adjuster
C. A measurement of moisture from a known dry, unaffected material of the same type
,D. The moisture level of a material when it reaches 0% moisture content
Answer: C
Conceptual Explanation: The Dry Standard is established by measuring a similar,
unaffected material in a dry area of the same building to determine the goal for drying.
3. Which of the following describes ‘Grain Depression’?
A. The reduction in the moisture content of wood floors
B. The drop in relative humidity as temperature increases
C. The reduction in specific humidity (GPP) between the air entering a dehumidifier and
the air leaving it
D. The pressure difference between the inside and outside of a containment area
Answer: C
Conceptual Explanation: Grain depression is the difference in grains per pound (GPP)
between the intake air and the output air of a dehumidifier, indicating its efficiency.
4. What is the primary purpose of using an air mover in the drying process?
A. To reduce the relative humidity of the room
B. To increase the rate of evaporation at the surface of materials
C. To filter microbial spores from the air
D. To remove moisture from the air and store it in a tank
, Answer: B
Conceptual Explanation: Air movers are used to increase the speed of evaporation by
removing the boundary layer of saturated air directly above the wet surface.
5. Which type of dehumidifier is most effective in environments with temperatures below
70°F and very low humidity?
A. Conventional Refrigerant Dehumidifier
B. Desiccant Dehumidifier
C. Thermal Dehumidifier
D. Low Grain Refrigerant (LGR) Dehumidifier
Answer: B
Conceptual Explanation: Desiccants use chemical attraction to remove moisture and are
highly effective in cool, dry conditions where refrigerants struggle.
6. Class 4 water intrusions involve which of the following?
A. Deeply saturated materials with low evaporation rates, like concrete or hardwood
B. Significant amount of water on low-porosity materials
C. Water that comes from a broken toilet trap
D. Minimal water damage affecting only a small portion of the carpet
Answer: A
CERTIFICATION PRACTICE EXAM
QUESTIONS AND ANSWERS
1. Which category of water originates from a source that does not pose a substantial risk
from dermal, ingestion, or inhalation exposure but may become contaminated if it contacts
other surfaces?
A. Category 2
B. Category 3
C. Special Situations
D. Category 1
Answer: D
Conceptual Explanation: Category 1 water originates from a sanitary water source and
does not pose substantial risk unless it becomes contaminated by secondary factors.
2. In a water restoration project, what is the ‘Dry Standard’?
A. The moisture content of the material at the time of the flood
B. The humidity level required by the insurance adjuster
C. A measurement of moisture from a known dry, unaffected material of the same type
,D. The moisture level of a material when it reaches 0% moisture content
Answer: C
Conceptual Explanation: The Dry Standard is established by measuring a similar,
unaffected material in a dry area of the same building to determine the goal for drying.
3. Which of the following describes ‘Grain Depression’?
A. The reduction in the moisture content of wood floors
B. The drop in relative humidity as temperature increases
C. The reduction in specific humidity (GPP) between the air entering a dehumidifier and
the air leaving it
D. The pressure difference between the inside and outside of a containment area
Answer: C
Conceptual Explanation: Grain depression is the difference in grains per pound (GPP)
between the intake air and the output air of a dehumidifier, indicating its efficiency.
4. What is the primary purpose of using an air mover in the drying process?
A. To reduce the relative humidity of the room
B. To increase the rate of evaporation at the surface of materials
C. To filter microbial spores from the air
D. To remove moisture from the air and store it in a tank
, Answer: B
Conceptual Explanation: Air movers are used to increase the speed of evaporation by
removing the boundary layer of saturated air directly above the wet surface.
5. Which type of dehumidifier is most effective in environments with temperatures below
70°F and very low humidity?
A. Conventional Refrigerant Dehumidifier
B. Desiccant Dehumidifier
C. Thermal Dehumidifier
D. Low Grain Refrigerant (LGR) Dehumidifier
Answer: B
Conceptual Explanation: Desiccants use chemical attraction to remove moisture and are
highly effective in cool, dry conditions where refrigerants struggle.
6. Class 4 water intrusions involve which of the following?
A. Deeply saturated materials with low evaporation rates, like concrete or hardwood
B. Significant amount of water on low-porosity materials
C. Water that comes from a broken toilet trap
D. Minimal water damage affecting only a small portion of the carpet
Answer: A
