FUNDAMENTAL SURVEYING Measurement and Data Collection 1

Question 1

Which type of leveling is most accurate for establishing precise vertical control?

Accepted Answer

Differential leveling

Answer

Differential leveling uses a level instrument and rod to directly measure height differences and is the most accurate field method.

Question 2

A backsight reading of 8.25 ft is taken on a BM with elevation 100.00 ft. What is the Height of Instrument (HI)?

Accepted Answer

108.25 ft

Answer

HI = elevation of BM + backsight reading = 100.00 + 8.25 = 108.25 ft.

Question 3

What is the allowable misclosure for a first-order leveling loop of 100 km?

Accepted Answer

± 4 mm √K

Answer

FGCS first-order Class I leveling requires misclosure ≤ 4 mm √K, where K is distance in kilometers.

Question 4

In EDM measurements, which atmospheric variable has the greatest effect on the speed of light?

Accepted Answer

Temperature

Answer

Temperature has the greatest effect on atmospheric refraction and the speed of electromagnetic waves in air.

Question 5

What is the purpose of a two-peg test in leveling?

Accepted Answer

To determine and correct collimation error

Answer

The two-peg test determines the collimation error (line of sight not horizontal) and allows the surveyor to correct it.

FUNDAMENTAL SURVEYING Practice Test