CST Mapping & Platting Techniques 2

Question 1

On a map drawn at 1" = 100', a line measures 3.25 inches. What ground distance does it represent?

Accepted Answer

325 ft

Answer

3.25 in × 100 ft/in = 325 ft.

Question 2

What is the representative fraction for an engineering scale of 1" = 200'?

Accepted Answer

1:2,400

Answer

200 ft × 12 in/ft = 2,400 inches, so the ratio is 1:2,400.

Question 3

On a topographic map, index contours are most commonly drawn heavier at which interval?

Accepted Answer

Every fifth contour

Answer

Standard practice makes every fifth contour a heavier, labeled index contour.

Question 4

When contour lines cross a stream, the V-shape they form points in which direction?

Accepted Answer

Upstream

Answer

Contours bend upstream where they cross a drainage channel.

Question 5

Contour lines that are spaced very closely together indicate:

Accepted Answer

A steep slope

Answer

Close spacing means elevation changes rapidly over a short horizontal distance.

CST - Certified Survey Technician Practice Test