Civil Engineering PE Surveying and Geomatics 2

Question 1

In the deflection angle method for horizontal curve layout, what is the total deflection angle from PC to PT if the central angle Δ = 40°?

Accepted Answer

20°

Answer

The total deflection angle from the tangent to the final chord at the PT equals Δ/2 = 40°/2 = 20°.

Question 2

Using the coordinate method, what is the area of a triangle with vertices at (0, 0), (6, 0), and (3, 4) in feet?

Accepted Answer

12 sq ft

Answer

Area = 0.5 × |x₁(y₂−y₃) + x₂(y₃−y₁) + x₃(y₁−y₂)| = 0.5 × |0 + 24 + 0| = 12 sq ft.

Question 3

A six-sided closed traverse has a total angular misclosure of 1°30". Distributing the error equally, what is the correction applied to each interior angle?

Accepted Answer

15"

Answer

1°30" = 90"; correction per angle = 90" / 6 = 15" per interior angle.

Question 4

What does a low Geometric Dilution of Precision (GDOP) value indicate in GPS surveying?

Accepted Answer

Favorable satellite geometry yielding higher positional accuracy

Answer

A low GDOP indicates that satellites are well spread across the sky, which minimizes the amplification of ranging errors into position errors.

Question 5

A benchmark has an elevation of 450.25 ft. A backsight of 4.78 ft and a foresight of 6.12 ft are recorded at the next point. What is the elevation of the foresight point?

Accepted Answer

448.91 ft

Answer

HI = 450.25 + 4.78 = 455.03 ft; Elevation = HI − FS = 455.03 − 6.12 = 448.91 ft.

Civil Engineering PE Practice Test

Civil Engineering PE Practice Test

Civil Engineering PE Surveying and Geomatics 2