Water Damage Restoration Moisture Measurement and Psychrometrics

Question 1

What does a psychrometer measure in water damage restoration?

Accepted Answer

Wet-bulb and dry-bulb temperatures to calculate relative humidity

Answer

Moisture content in building materials

Answer

Atmospheric pressure changes

Answer

Dew point only

Question 2

What is 'grain depression' in the context of dehumidification?

Accepted Answer

The reduction in grains of moisture per pound of dry air after dehumidification

Answer

The drop in air pressure caused by dehumidifier operation

Answer

A measurement of structural moisture content

Answer

The temperature change across a dehumidifier coil

Question 3

What instrument is used to measure moisture content in wood and other building materials?

Accepted Answer

Moisture meter

Answer

Hygrometer

Answer

Psychrometer

Answer

Thermo-hygrometer

Question 4

What is the dew point temperature?

Accepted Answer

The temperature at which air becomes saturated and condensation begins

Answer

The temperature at which ice forms on surfaces

Answer

The optimal temperature for dehumidifier operation

Answer

The temperature difference between inside and outside air

Question 5

What does 'relative humidity' (RH) measure?

Accepted Answer

The ratio of actual moisture in the air to the maximum it can hold at that temperature

Answer

The total amount of water vapor in the air

Answer

The weight of water per cubic foot of air

Answer

The rate at which moisture evaporates from surfaces

Question 6

What does a non-penetrating moisture meter use to detect moisture levels?

Accepted Answer

Radio frequency or electromagnetic signals

Answer

Inserted probes that contact the material directly

Answer

Electrical resistance between two surface pins

Answer

Infrared thermal imaging