Construction Coordinator Practice Exam

To determine the amount of contraction in a conduit due to a temperature drop, it's essential to understand the thermal expansion and contraction principles of materials, often indicated by their coefficient of linear expansion.

For most metals, the coefficient of linear expansion is approximately 0.0000065 per degree Fahrenheit. The temperature change in this scenario is from 94°F to 54°F, which is a drop of 40°F.

Using the formula for linear contraction:

Contraction = Original Length × Coefficient of Expansion × Temperature Change

Substituting the known values:

Contraction = 1,200 feet × 0.0000065 × 40°F

First, convert the feet into inches, as the final contraction is given in inches:

1,200 feet × 12 inches/foot = 14,400 inches

Now apply the values into the contraction formula:

Contraction = 14,400 inches × 0.0000065 × 40

Calculating this gives:

Contraction = 14,400 × 0.0000065 × 40 = 3.744 inches

So, the total contraction amount is approximately 3.744 inches, which might suggest revisiting the provided choices. However, it