Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
______ R-value of a structural panel is the average R-value for the entire assembly.
The average accounts for the different layers of material in the structure sandwich,
air film resistance and the effect of parallel conduction paths associated with framing materials.
Overall R- values are expressed as (SqFT x DEG F) / (Btuh) a. | subtracted | c. | average | b. | added | d. | overall | | | | |
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2.
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The R
value of a material is the thermal resistance associated with a specific _____? a. | layer | c. | conductance | b. | density | d. | thickness | | | | |
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3.
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Air
film resistances are ______ to the other R values associated with a structural
panel? a. | added | c. | muliplied | b. | subtracted | d. | none of these | | | | |
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4.
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A
wall sandwich having a overall R value of 18.1 would have a transmission coefficient (U) valve of
what? a. | 0.055 | c. | 0.255 | b. | 0.155 | d. | 18.1 | | | | |
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5.
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A
window glass per inch offers a R- Per Inch of what value listed below? a. | 1.00 | c. | 0.185 | b. | 170 | d. | 0.023 | | | | |
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6.
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If a
wall is made up of common brick which is 5 inches thick what is the R- Value of this
brick?
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7.
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Using
the greatest value per inch listed, what would the total R value be for sprayed on polyurethane foam
which is applied at 26 inches?
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8.
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A
wall has a combined sandwich R- value of all the materials equal to 14.5 R. What is the U value of
the sandwich?
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9.
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With
a dead air space between two structural panels with the direction of heat flow up and the panel
surface orientation to be horizontal and a gap of 1.50 inches, what is R value with no reflective
surfaces facing the air gap?
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10.
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A
2” terrazzo has an R value of what?
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