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GATE 2019 Surveying Quiz 4

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Question 1

The diaphragm of a tachometer are 3 in number spaced at 1.25mm. The distance from the object glass and the trunnion axis is 0.11m with the focal length of the object glass as 240 mm. Considering that a convex lens is used in the externally focusing telescope, compute the constants(multiplying & additive) using the principle of optics.

Question 2

Which of the following are among the fundamental lines of a theodolite?
1) The vertical and horizontal axes
2) The lines of collimation and axis of the plate levels.
3) The bubble line of the altitude level

Question 3

In a tachometric surveying the levelling staff is observed with an object glass of focal length 250mm. Determine the distance between the staff and the instrument station when the distance between the vertical axis of the tachometer and the optical center of object glass is 112mm. Consider the spacing between the upper and lower line of diaphragm axis as 3.7mm and the observed staff readings are 1.1m, 2.3m and 3.12m.

Question 4

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 5

If the bubble tube of a level has a sensitiveness of 35 per 2 mm division, find the error in staff reading on a vertical staff at a distance of 100 m caused by the bubble bending 3/2 divisions out of centre.

Question 6

What is the distance between the line of sight and the trunnion axis the hypotenuse distance for a tachometric instrument of height 1.5m is fitted with an internal focusing telescope and positioned at a reduced level of 105.5m? The instrument focusses a vertically held staff at an angle of 5 °12’. The staff readings are 1.31m, 2.12m, and 3.23m. Assume the value of the additive constant to be 8 cm and multiplying constant as 1230.
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Mar 5ESE & GATE CE