ETC ETC Surveying & Site Measurement 2

Question 1

What is the purpose of a topographic survey?

Accepted Answer

To map the elevations and contours of the land surface

Answer

A topographic survey measures and maps the elevation, slope, and surface features of the terrain using contour lines and spot elevations.

Question 2

In differential leveling, what does backsight (BS) refer to?

Accepted Answer

A rod reading taken on a point of known elevation to establish the instrument height

Answer

A backsight is the first rod reading taken after setting up the level, placed on a benchmark to calculate the height of instrument.

Question 3

What instrument measures both horizontal and vertical angles and is commonly used for triangulation surveys?

Accepted Answer

Theodolite

Answer

A theodolite precisely measures horizontal and vertical angles, making it essential for triangulation and traversing in engineering surveys.

Question 4

What is a rod reading in differential leveling?

Accepted Answer

The graduated staff measurement read through the level to determine elevation difference

Answer

A rod reading is the numeric value read on a graduated leveling rod through the telescope to compute elevation differences.

Question 5

What does cut and fill mean in site grading work?

Accepted Answer

Excavating high areas and using that material to build up low areas

Answer

Cut and fill balances earthwork by excavating elevated areas and using the soil to raise lower areas to the design grade.

(ETC) Engineering Technician Certification Practice Test