# Surveying Questions and Answers – EDM – Total Station

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “EDM – Total Station”.

1. In total station, data is stored in ___________
a) Pen drive
b) Data card
c) Micro processor
d) External hardware

Explanation: Micro processor provided in the instrument helps in saving the data and helps in transferring it to the system, by which it can be viewed in different software.

2. Compensator can make complete adjustments in total station.
a) True
b) False

Explanation: The use of compensator can be found in case of finding vertical angles, where the instrument has to be perfectly levelled. But the compensator isn’t sufficient to provide perfect levelling. Manual operation is also involved in obtaining perfect level.

3. Vertical angle is measured in the total station as Zenith angle.
a) False
b) True

Explanation: The vertical angle is usually measured as a zenith angle which indicates 0° vertically up, 90° at horizontal, and 180° vertically down. The zenith angle is generally easier to work.

4. Which of the following indicates the formula for converting slope distance to horizontal distance?
a) S = H (sin z)
b) H = S* S (sin z)
c) H*H = S (sin z)
d) H = S (sin z)

Explanation: The slope distance obtained can be used for calculating horizontal distance from the formula, H = S (sin z) where, H= horizontal distance, S = slope distance.

5. When total station is sighted to the target, which of the operation acts first?
a) Rotation of optical axis
b) Rotation of vertical axis
c) Rotation of horizontal axis
d) Rotation of line of collimation

Explanation: At the time of sighting the instrument towards the target, first step involves the rotation of the instrument’s optical axis from the instrument north in horizontal plane.

6. Which of the following indicates the correct set of the combination of total station?
a) Theodolite, compass
b) Theodolite, EDM
c) Electronic theodolite, EDM
d) EDM, GPS

Explanation: A total station is a combination of an electronic theodolite and an Electronic Distance Measurement. This combination makes it possible to determine the coordinates of a reflector by aligning the instruments cross-hairs on the reflector and simultaneously measuring the vertical, horizontal angles and slope distances.

7. Which among the following doesn’t indicate the basic calculation of the total station?
a) Horizontal distance
b) Slope distance
c) Vertical distance
d) Co-ordinate calculations

Explanation: The basic calculations of total stations include horizontal distance, vertical distance, co-ordinate distance in which, slope distance is used in horizontal distance calculations. It is obtained directly from the total station equipment.

8. The formula for difference in elevation can be given as__________
a) D = V + (I-R)
b) D = V + (I+R)
c) D = V – (I-R)
d) D = V * (I-R)

Explanation: The difference in elevation can be given as D = V + (I-R) where, V= vertical difference between two points, I =instrument height, R = height of centre of reflector.

9. In which direction it is best to place the total station for obtaining the best output?
a) East
b) West
c) South
d) North

Explanation: The best procedure while using a Total Station is to set a convenient “north” and carry this through the survey by using back sight process when the instrument is moved.

10. The data obtained from total station can be used in which among the following software directly?
a) Primavera
c) Autodesk Revit
d) Surfer

Explanation: The data obtained from the total station can be indirectly used in STAAD Pro, Autodesk Revit, Primavera but it can be directly used in software’s like Arc GIS, Surfer, Auto CAD etc., as they are linked with it.

11. Calculation the elevation difference if the vertical distance is 14.89m, instrument height is 9.2m, ground is at 2.8m.
a) 21.29 m
b) 12.29 m
c) 21.92 m
d) 41.29 m

Explanation: The elevation difference in total station can be calculated as
dz = Vd + (Ih-Rh). On substitution, we get
dz = 14.89 + (9.2-2.8)
dz = 21.29 m.

12. Find the vertical distance if the value of slope distance can be given as 12.98 and the angle is 1˚23ꞌ.
a) 21.97m
b) 12.97m
c) 12.79m
d) 21.79m

Explanation: The vertical distance can be calculated by using the formula,
Vd = Sd*cosZa = 12.98*cos (1˚23ꞌ) Vd = 12.97m.

13. Find the elevation of ground beneath the reflector, if the known elevation of instrument is 12.76m, slope distance = 3.76m, angle is about 3˚43ꞌ, instrument height = 2.93m, ground is at 0.987 m.
a) 18.54m
b) 81.54m
c) 18.45m
d) 18.97m

Explanation: The elevation of ground beneath the reflector can be given as
Rz = Iz + Sd * cosZa + Ih – Rh. On substitution, we get
Rz = 12.76 + (3.76*cos (3˚43ꞌ)) + 2.93 – 0.987
Rz = 18.45 m.

Sanfoundry Global Education & Learning Series – Surveying.

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