FUNDAMENTAL SURVEYING Measurement and Data Collection 2

Question 1

A steel tape calibrated at 68°F is used at 95°F. If the tape is 100 ft long, what is the temperature correction?

Accepted Answer

+0.018 ft

Answer

Temperature correction = 0.0000065 × (95−68) × 100 = 0.0000065 × 27 × 100 ≈ +0.018 ft.

Question 2

Which of the following best describes a GPS carrier-phase measurement?

Accepted Answer

Counting the number of complete wavelengths between satellite and receiver

Answer

Carrier-phase measurement counts the number of full and fractional wavelengths of the carrier signal between satellite and receiver.

Question 3

What is the purpose of a plumb bob or optical plummet in surveying?

Accepted Answer

To center the instrument over a ground point

Answer

A plumb bob or optical plummet is used to align the instrument's vertical axis directly over the survey point on the ground.

Question 4

What is the term for the error caused by the line of sight not being perpendicular to the horizontal axis of a theodolite?

Accepted Answer

Collimation error

Answer

Collimation error occurs when the line of sight (collimation axis) is not perpendicular to the horizontal (trunnion) axis.

Question 5

In total station surveying, what does 'PPM' correction refer to?

Accepted Answer

Parts per million atmospheric correction applied to EDM measurements

Answer

PPM (parts per million) corrections are applied to EDM distance measurements to account for atmospheric temperature and pressure effects.

FUNDAMENTAL SURVEYING Practice Test