FUNDAMENTAL SURVEYING Leveling & Differential Leveling 3

Question 1

What is 'trigonometric leveling'?

Accepted Answer

Computing elevation differences from measured slope distances and vertical angles

Answer

Leveling using water tubes connected between two points

Answer

A method using only a hand level and stadia rod

Answer

Leveling by averaging many barometric readings

Question 2

Which datum is used as the standard vertical datum in the United States?

Accepted Answer

NAVD 88

Answer

NGVD 29

Answer

WGS 84

Answer

NAD 83

Question 3

A Philadelphia rod reads 4.756 ft but is not perfectly plumb. The reading will be:

Accepted Answer

Too large

Answer

Too small

Answer

Exactly correct

Answer

Negative

Question 4

What is the purpose of the 'peg test' (two-peg test) for a level instrument?

Accepted Answer

To detect and measure collimation error in the line of sight

Answer

To check if the tripod is stable

Answer

To calibrate the rod interval factor

Answer

To check if the bubble tube is centered

Question 5

In barometric leveling, what relationship is used to estimate elevation?

Accepted Answer

The decrease in atmospheric pressure with increasing altitude

Answer

The relationship between temperature and humidity

Answer

The magnetic variation at different elevations

Answer

The curvature of the Earth at different latitudes

Question 6

A level circuit has a total length of 4 miles and a closure error of 0.06 ft. What is the total distance in feet?

Accepted Answer

21,120 ft

Answer

5,280 ft

Answer

10,560 ft

Answer

2,640 ft