LSIT Surveying Principles and Practices 2

Question 1

In a closed traverse, the angular closure error is distributed by the Compass Rule. What does this rule assume?

Accepted Answer

Errors are proportional to the length of each course

Answer

The Compass Rule (Bowditch Rule) distributes closure error in proportion to each course's length relative to the total traverse length.

Question 2

What is the purpose of a backsight when using an automatic level?

Accepted Answer

To establish a known elevation on the rod and compute the Height of Instrument

Answer

A backsight is taken on a benchmark or turning point of known elevation to compute the Height of Instrument (HI = elevation + rod reading).

Question 3

Which map projection preserves true directions from a central point, making it useful for navigation charts?

Accepted Answer

Gnomonic

Answer

The Gnomonic projection is the only projection on which all great circles appear as straight lines, making directions from the center true.

Question 4

A surveyor measures a slope distance of 250.00 ft at a vertical angle of +3°30'. What is the approximate horizontal distance?

Accepted Answer

249.31 ft

Answer

Horizontal distance = slope distance × cos(vertical angle) = 250.00 × cos(3°30') ≈ 249.31 ft.

Question 5

In the State Plane Coordinate System (SPCS), which projection is used for states or zones with a greater east-west extent?

Accepted Answer

Lambert Conformal Conic

Answer

Lambert Conformal Conic is used for zones elongated east-west, while Transverse Mercator is used for zones elongated north-south.

(LSIT) Land Surveyor in Training Practice Test