FUNDAMENTAL SURVEYING Measurement and Data Collection 3

Question 1

The sensitivity of a level bubble is expressed as the angle subtended per division. A 20″/2mm bubble is considered:

Accepted Answer

Very sensitive

Answer

A 20 arc-seconds per 2mm division bubble is considered very sensitive and suitable for precise leveling work.

Question 2

What is a turning point (TP) in differential leveling?

Accepted Answer

An intermediate point used to carry elevations forward

Answer

A turning point is an intermediate point on which both a foresight and a backsight are taken to carry elevations from one instrument setup to the next.

Question 3

What type of error is eliminated by observing both face-left and face-right with a theodolite?

Accepted Answer

Systematic errors including collimation and trunnion axis errors

Answer

Reversing the telescope (face-left and face-right) eliminates systematic instrument errors such as collimation, trunnion axis, and circle eccentricity errors.

Question 4

In GNSS surveying, what is 'PDOP' and why does it matter?

Accepted Answer

Position Dilution of Precision — lower values indicate better satellite geometry and higher accuracy

Answer

PDOP (Position Dilution of Precision) quantifies satellite geometry; lower PDOP means satellites are well distributed and position accuracy is higher.

Question 5

What is the primary advantage of using RTK (Real-Time Kinematic) GNSS over static GNSS?

Accepted Answer

Real-time centimeter-level positions without post-processing

Answer

RTK GNSS provides centimeter-level accuracy in real time by transmitting corrections from a base station to a rover.

FUNDAMENTAL SURVEYING Practice Test

FUNDAMENTAL SURVEYING Practice Test

FUNDAMENTAL SURVEYING Measurement and Data Collection 3