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Category: Humidity and moisture

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Daily Quiz (22)

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True or false: Relative humidity sensors used to determine moisture content of concrete slabs can produce fairly accurate results within an hour after probes are inserted into a slab, according to a manufacturer of the test equipment.

Wednesday, November 26, 2014


When assessing the moisture content of wood with a suitable moisture meter, what level of moisture is generally considered to be the upper limit for successful painting?

Tuesday, November 25, 2014


How can a hygro thermometer be useful in coating work?

Monday, December 9, 2013


What is another name for wet storage stain?

Friday, November 8, 2013


True or False: The plastic sheet method is a quantitative test for determining the extent of moisture in a concrete slab.

Monday, October 14, 2013


True or False: Relative humidity at the surface of bridge steel may be different from the relative humidity in the atmosphere away from the steel surface.

Wednesday, October 9, 2013


What does the anhydrous calcium chloride test measure?

Wednesday, October 2, 2013


True or False? Many coating manufacturers recommend a maximum relative humidity of 40% within a concrete slab before their flooring products are applied.

Friday, August 9, 2013


True or False? Before electronic instruments became available to measure dew point and relative humidity directly, surface temperature thermometers were used to derive these readings.

Thursday, June 27, 2013


When assessing the moisture content of wood with a suitable moisture meter, what level of moisture is generally considered the upper limit for successful painting?

Tuesday, April 30, 2013


True or False: Air leakage into a building can generate much more moisture than moisture vapor transmission can.

Tuesday, April 30, 2013


True or false: To hold the blast (prevent re-rusting of blasted steel) inside a tank, one effective measure is to use dehumidification to keep relative humidity below 50%.

Monday, January 7, 2013


True or false: There are no quantitative methods for determining levels of moisture in concrete floor slabs.

Sunday, July 22, 2012


True or false: The anhydrous calcium chloride test for measuring moisture in concrete slabs is a qualitative rather than a quantitative test.

Monday, July 9, 2012


True or false: The density of concrete prevents water vapor and gases from moving freely within the matrix.

Monday, January 30, 2012


Instruments used to test moisture in concrete or masonry walls are based on what principle?

Wednesday, January 25, 2012


True or false: The most accurate meters for detecting moisture within a concrete substrate are based on readings of temperature and humidity.

Tuesday, December 20, 2011


Why would a test for moisture content of concrete be important prior to application of thick-film elastomeric coatings?

Thursday, September 15, 2011


Dried salt deposits on a brick exterior (see photo), resulting from moisture leakage through a wall, are called what?

Tuesday, July 19, 2011


When assessing the moisture content of wood with a suitable moisture meter, what level of moisture is generally considered the upper limit for successful painting?

Thursday, April 7, 2011


True or false: Both relative humidity and temperature differentials from one side to the other can drive moisture vapor through a block wall.

Monday, February 14, 2011


True or false: A moisture content of 30%, as measured by a moisture meter, is generally considered the upper limit for successful painting of wood.

Friday, September 24, 2010


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