RPLS Equipment and Tools Knowledge 2

Question 1

What is the primary purpose of a tribatch (tribrach) on a surveying instrument?

Accepted Answer

To level and center the instrument over a point

Answer

A tribrach is a leveling base that allows the instrument to be precisely leveled and centered over a ground point using leveling screws and an optical plummet.

Question 2

Which type of EDM (Electronic Distance Measurement) uses a modulated infrared or laser beam reflected by a prism target?

Accepted Answer

Electro-optical EDM

Answer

Electro-optical EDMs use modulated light (infrared or laser) reflected from a retroreflective prism to measure distances based on phase differences.

Question 3

A surveyor notices the bubble in the plate level of a total station drifts consistently to the same side after rotating 180°. This indicates:

Accepted Answer

The plate level vial needs adjustment (two-peg test error)

Answer

When the bubble displaces by the same amount after a 180° rotation, the vial axis is not perpendicular to the vertical axis and requires adjustment.

Question 4

What does the term 'stadia' refer to in traditional surveying?

Accepted Answer

A method of measuring horizontal distances using crosshair intercepts on a rod

Answer

Stadia is an optical distance measurement method where the distance is computed from the intercept between upper and lower stadia hairs read on a leveling rod.

Question 5

When using a digital level, what is the function of the bar-code rod?

Accepted Answer

It allows the instrument to electronically read rod height without a human reading

Answer

The bar-code pattern on a digital level rod is scanned by the instrument's CCD sensor, automatically computing the rod reading and distance without a manual observation.

(RPLS) Registered Professional Land Surveyor Practice Test

(RPLS) Registered Professional Land Surveyor Practice Test

RPLS Equipment and Tools Knowledge 2