IICRC WRT EXAM 2 LATEST VERSIONS (VERSION A & B) ACTUAL EXAM 250 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES|ALREADY GRADED A+

IICRC WRT EXAM 2 LATEST VERSIONS (VERSION A

& B) 2023-2024 ACTUAL EXAM 250 QUESTIONS AND

CORRECT DETAILED ANSWERS WITH

RATIONALES|ALREADY GRADED A+

VERSION A

The greater the temperature of wet materials, the more energy is

available for __________ to occur. - ANSWER- Evaporation

If a drying chamber is 75 degrees and 40% RH, what is the

humidity ratio? (use psychrometric chart) - ANSWER- 52 gpp

(grains of moisture per pound of dry air)

If a drying chamber is 68 degrees and 70% RH, what is the humidity

ratio? (use psychometric chart) - ANSWER- 72 gpp (grains of moisture

per pound of dry air)

If a drying chamber is 70 degrees and 60 gpp, what is the RH? (use

psychometric chart) - ANSWER- 55%

If the exterior is 42 degrees and 30% RH, what is the humidity ratio?

(use psychometric chart) - ANSWER- 12 gpp (grains of moisture per

pound of dry air)

If a drying chamber is 32% RH and 60gpp, what is the temperature? (use

psychometric chart) - ANSWER- 87 degrees

What is the relative humidity if the dew point temperature is 35 degrees

and the dry bulb temperature is 70 degrees (use psychometric chart) -

ANSWER- 28%

A material that is very weakened when wet, but, if dried properly,

regains its original strength is... - ANSWER- Gypsum (drywall,

wallboard, sheetrock)

The ability for water vapor to move through materials is known as... -

ANSWER- permeability

Classes of water describe - ANSWER- The potential rate of evaporation

(evaporation load)

A drying chamber that has the least amount of area affected (less than

5%) of the combined walls, floors and ceiliing material is ... -

ANSWER- class 1

A class 2 loss is a drying chamber that has a significant amount of

moisture affecting ____________ of the combined walls, floors and

ceiling materials. - ANSWER- 5% - 40%

A drying chamber that has the greatest amount of moisture, affecting

over 40% of the combinded walls, floors and ceiling materials is... -

ANSWER- class 3

A drying chamber that has water bound in materials such as plaster or

hadwood resulting in low potential evaporation is a.... - ANSWER- class

4

If attempting to dry tile over a wood subfloor... - ANSWER- Provide dry

air flow (low humidity) and Increase heat or thermal energy.

What safety features does drying equipment need? (air movers,

dehumidifiers, etc) - ANSWER- grounded plug

What can happen when ducting airflow directly into wall cavities? -

ANSWER- Increase the rate of evaporation

Dehumidifiers balance the drying system by removing moisture from the

air. A balanced drying system is best achieved when the rate of

dehumidification

is _________________________ than or equal to the rate of

evaporation. - ANSWER- greater

How do refrigerant dehumidifiers remove moisture from the air? -

ANSWER- Condensation

Refrigerant dehumidifiers are rated for water removal in ... - ANSWERpints per day (ppd)

Desiccant dehumidifiers remove moisture from the air through principle

of ... - ANSWER- absorption

Since desiccant dehumidifiers do not remove water vapor through

condensations, they are not limited by... - ANSWER- temperature

In an area that measures 15,000 cubic feet, what is the initial AHAM

requirement for a Class 2 loss, using an LGR (refrigerant) dehumidifier?

(use factor chart) - ANSWER- 15,000 cu ft / 50 = 300 ppd pints per day

A class 3 loss that measures 15' x 35' and has a ceiling height of 9', how

many 100-pint LGRs are needed? (refrigerant formula) - ANSWER- 2:

(15 x 30 x 9 = 4050 cu ft/40 (from chart) = 118 pints per day. we need 2

because our LGR only does 100ppd.

A warehouse that measures 35' x 40' x 10' has a class 4 loss, using a

desiccant dehumidifier. How many CFM are required? (desiccant

formula) - ANSWER- 700:

35 x 40 x 10 = 14,00 cu ft. x 3 ACH (air changes per hour) / 60 =

42,000/60 = 700 cfm (cu ft per minute)

To control particles in the air you could install... - ANSWER- An air

filtration device (AFD)