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GATE CE 2022: Transportation Engineering & Surveying Quiz #12

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Question 1

For a vertically held staff, if the angle of elevation is 300 and horizontal distance between observer and staff station is 100 m. staff intercept will be-
(take multiplying constant = 100 & additive constant = 30)

Question 2

The focal length of the object glass of a tacheometer is 200 mm, the distance between the vertical axis of the tacheometer and the optical centre of the object glass is 100 mm and the spacing between the upper and lower line of the diaphragm axis is 4 mm. With the line of collimation perfectly horizontal, the staff intercepts are 1 m (top), 2 m (middle), and 3 m (bottom). The horizontal distance (m) between the staff and the instrument station is

Question 3

The horizontal distance between two stations P and Q is 100 m. The vertical angles from P and Q to the top of a vertical tower at T are 3 ° and 5 ° above horizontal, respectively. The vertical angles from P and Q to the base of the tower are 0.1 ° and 0.5 ° below horizontal, respectively. Stations P, Q and the tower are in the same vertical plane with P and Q being on the same side of T. Neglecting earth’s curvature and atmospheric refraction, the height (in m) of the tower is

Question 4

The following observation were taken with a tacheometer at the station A to a staff at B held normal to the line of sight. If staff readings are 2m, 3m, & 4m and the angle of inclination is 23 ̊30. Determine horizontal distance between A and B. also what is the RL of B if RL of A is 200m. Take K=100, C =0.6 & H.I.=1.46m

Question 5

A tacheometer is setup at station A and the staff is held vertical at a point B. The telescope inclined at an angle of depression 10 ° to the horizontal, the readings on the staff are 2.680, 1.825, 1.000 m. If the height of instrument (HI) is 1.40 m and R.L. of station A is 360.8 m, then the R.L. of point B is _________cm.
[Take multiplying and additive constant of the instrument to be 100 and 1 respectively]

Question 6

A theodolite is set up at station A and a 3 m long staff is held vertically at station B. The depression angle reading at 2.5 m making on the staff is 6 °10 ¢. The horizontal distance between A and B is 2200m. Height of instrument at station A is 1.1 m and R.L. of A is 880.88 m. Apply the curvature and refraction correction, and determine the R.L. of B (in m). ____
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