IICRC Water Damage Restoration Technician (WRT) certification with
confidence. This definitive 2026/2027 practice exam features verified quest
ions and answers
IICRC Water Damage Restoration Technician (WRT)
Practice Exam #2 — Scenario & Application Focus
Instructions: Choose the best answer. Aim for 32/40 (80%) or higher.
Questions 1–10: Psychrometry & Environmental Control
1. A technician measures the following: air temperature 75°F, relative humidity 65%. What is the most accurate
statement about the drying environment?
A) The vapor pressure deficit is high, making drying efficient.
B) The air is near saturation; drying will be slow without dehumidification.
C) The dew point is below freezing.
D) This is the ideal drying condition for structural materials.
, 2. A refrigerant dehumidifier is operating in a basement at 55°F. The coils are freezing up. What is the most likely
cause?
A) The dehumidifier is oversized for the space.
B) The air temperature is below the efficient operating range of the unit.
C) The humidity is too low.
D) The air movers are blowing directly at the dehumidifier.
3. What is the formula for calculating Grains Per Pound (GPP) removal efficiency of a dehumidifier?
A) Inlet GPP − Outlet GPP = Grains removed per pound of air
B) Outlet GPP ÷ Inlet GPP = Efficiency ratio
C) Inlet GPP × Airflow CFM = Total grains removed
D) Dew point temperature × Relative humidity = GPP
4. A technician increases the temperature in a drying chamber from 70°F to 85°F while the specific humidity
remains constant. What happens to the relative humidity?
A) Relative humidity increases.
B) Relative humidity decreases.
C) Relative humidity remains the same.
D) Relative humidity becomes equal to the dew point.
5. Which psychrometric property represents the actual amount of moisture in the air, measured in grains per
pound of dry air?
A) Relative humidity
B) Dew point temperature
C) Specific humidity (humidity ratio)
D) Wet bulb temperature
6. A drying chamber has an ambient temperature of 80°F and a relative humidity of 50%. A technician introduces
4,000 CFM of outside air at 95°F and 70% RH. What is the likely effect?
A) The drying rate will increase significantly.
confidence. This definitive 2026/2027 practice exam features verified quest
ions and answers
IICRC Water Damage Restoration Technician (WRT)
Practice Exam #2 — Scenario & Application Focus
Instructions: Choose the best answer. Aim for 32/40 (80%) or higher.
Questions 1–10: Psychrometry & Environmental Control
1. A technician measures the following: air temperature 75°F, relative humidity 65%. What is the most accurate
statement about the drying environment?
A) The vapor pressure deficit is high, making drying efficient.
B) The air is near saturation; drying will be slow without dehumidification.
C) The dew point is below freezing.
D) This is the ideal drying condition for structural materials.
, 2. A refrigerant dehumidifier is operating in a basement at 55°F. The coils are freezing up. What is the most likely
cause?
A) The dehumidifier is oversized for the space.
B) The air temperature is below the efficient operating range of the unit.
C) The humidity is too low.
D) The air movers are blowing directly at the dehumidifier.
3. What is the formula for calculating Grains Per Pound (GPP) removal efficiency of a dehumidifier?
A) Inlet GPP − Outlet GPP = Grains removed per pound of air
B) Outlet GPP ÷ Inlet GPP = Efficiency ratio
C) Inlet GPP × Airflow CFM = Total grains removed
D) Dew point temperature × Relative humidity = GPP
4. A technician increases the temperature in a drying chamber from 70°F to 85°F while the specific humidity
remains constant. What happens to the relative humidity?
A) Relative humidity increases.
B) Relative humidity decreases.
C) Relative humidity remains the same.
D) Relative humidity becomes equal to the dew point.
5. Which psychrometric property represents the actual amount of moisture in the air, measured in grains per
pound of dry air?
A) Relative humidity
B) Dew point temperature
C) Specific humidity (humidity ratio)
D) Wet bulb temperature
6. A drying chamber has an ambient temperature of 80°F and a relative humidity of 50%. A technician introduces
4,000 CFM of outside air at 95°F and 70% RH. What is the likely effect?
A) The drying rate will increase significantly.
