WRT STUDY GUIDE EXAM QUESTIONS

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WRT STUDY GUIDE EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -75 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: How many categories of water are there and how many classes?

Answer:

• Categories (C.
• T has 3 letters)
• Classes

Question 2: What is structural cavity drying?

Answer:

Octidry

Question 3: What are the 2 types of dehumidifiers? Explain them both

Answer:

Refrigerant: (Conventional and Low Grain, LGR) works through condensation and MOST efficient in 70-90 degrees F.Desiccant: Useful in colder conditions. Produces LOW vapor pressure (IDEAL for drying class 4 water losses) Can over dry and create damage if used incorrectly.

Question 4: When should carpet cushions ALWAYS be disposed of?

Answer:

When affected by category 2 or 3 water

Question 5: What is an AHAM rating?

Answer:

Association of Home Appliance Manufacturers, ratings are expressed in the number of pints of water removed. Dehumidifiers are tested in conditions of 80 ?F and 60%RH for a 24 hour period

Question 6: What are some examples of regulated, hazardous materials or mold?

Answer:

Lead, asbestos, mercury, etc.

Question 7: What are of the most common safety concerns at the work site?

Answer:

Slip and fall hazards

Question 8: What is psychrometry?

Answer:

Study of the relationship between airflow, humidity and temperature(HAT) and how these affect the drying process.Question 9: To determine the amount of dehumidification necessary, what info is needed?

Answer:

Cubic footage, class of loss, and type of dehumidifier Question 10: What is an example of a vapor barrier or a vapor retarding material?

Answer:

Vinyl flooring

Question 11: What are the extraction tools?

Answer:

-Light wand -Deep extraction (stationary tool- water claw or weighted compression tool) -Squeegee -Portable extractor -Truck mount extractor

-Submersible pumps

Question 12: Explain class 4 water damage

Answer:

-Deeply held or bound water -Water intrusion that involves a significant amount of water absorption into low evaporation materials.-Drying may require special methods, longer drying times, or substantial water vapor pressure differentials.

Question 13: Explain category 2 water damage

Answer:

Significant contamination, includes risk of sickness or discomfort.EX: overflow from washing machine or dishwasher- has detergents and soils from clothes or dishes Question 14: Microbial growth is more likely to occur when relative humidity levels are at what percentage?

Answer:

68%

Question 15: What does PPE stand for and what are some exampes?

Answer:

Personal Protective Equipment -Respirator -Splash goggles -Water resistant gloves -Hard hat -Rubber boots with steel toes -Protective clothing

Question 16: Desiccant dehumidification formula?

Answer:

cubic feet × factor = total CFH (cubic feet per hour) ÷ 60 (minutes in a hour) = initial CFM/cubic feet per minute (cubic feet of air moved or processed) needed Question 17: A drying chamber that had water bound in materials such as plaster or hardwood resulting in low potential evaporation is a...

Answer:

Class 4

Question 18: What is the result when the air becomes warmer (increase in temp)?

Answer:

Relative humidity decreases

Question 19: What are mycotoxins?

Answer:

A toxigenic chemical substance released by some mold to protect its "turf" from other types of mold after the same food source.

Question 20: To promote effective drying, restorers need to control...

Answer:

Air temp of the drying chamber, vapor pressure of the drying chamber, Surface temp of the materials

Question 21: A surface with a temperature below dew point can result in what

Answer:

Condensation

Question 22: Explain Class 1 water damage

Answer:

-Least amount of water absorption & evaporation load.-Wet, porous materials represent LESS than 5% of combined floor, wall, and ceiling surface area in the space.

Question 23: What is the "Dew point"?

Answer:

The temperature at which condensation begins.-Dew is DIRECTLY related to GPP

Question 24: How is the CLASS of water damage determined?

Answer:

By potential rate of evaporation based on amount of water and types of materials affected.-Classes 1-4