Theodolite Traversing Lecture 26
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Questions and Answers

What is the main purpose of a theodolite?

  • Measuring horizontal distance
  • Calculating area of land
  • Measuring angles in horizontal and vertical planes (correct)
  • Determining the volume of a structure
  • Which of the following is NOT a use of a theodolite?

  • Measuring magnetic bearing
  • Calculating area of land (correct)
  • Finding vertical height of an object
  • Measuring deflection angle
  • What is the function of the vertical circle in a theodolite?

  • Measure vertical angles (correct)
  • Measure horizontal angles
  • Eliminate parallax
  • Focus the telescope
  • Which type of theodolite is not mentioned in the text?

    <p>Digital Theodolite</p> Signup and view all the answers

    What is the least count of a theodolite used for measuring angles up to 10'' or 20''?

    <p>$1''$</p> Signup and view all the answers

    What part of a theodolite is used to find the difference of elevation between various points?

    <p>Vertical Scale</p> Signup and view all the answers

    What is used to hold the telescope at a particular vertical angle?

    <p>Vertical Clamp</p> Signup and view all the answers

    Which part of the instrument is responsible for defining the horizontal direction in which the telescope is sighted?

    <p>Horizontal Scale</p> Signup and view all the answers

    What is necessary for the upper plate to be perpendicular to and parallel to?

    <p>Alidade Axis and Trunnion Axis</p> Signup and view all the answers

    What is used to adjust and level the upper plate of the instrument?

    <p>Three-foot screws</p> Signup and view all the answers

    Which part of the instrument must be used at the start of a sequence of horizontal angle measurements to set the first reading to zero?

    <p>Upper Horizontal Clamp</p> Signup and view all the answers

    What component carries two Verniers and clipping screws?

    <p>Index Bar</p> Signup and view all the answers

    What is used for levelling particularly when taking vertical angle observations?

    <p>Plumb Bob</p> Signup and view all the answers

    What is located on one of the standards and requires illumination?

    <p>Vertical Circle</p> Signup and view all the answers

    What is provided to clamp the horizontal circle to the lower plate?

    <p>Lower Horizontal Clamp</p> Signup and view all the answers

    Which part of the instrument reflects maximum light onto the vertical and horizontal circles?

    <p>Circular Mirrors</p> Signup and view all the answers

    What is the method used to measure a horizontal angle to a finer degree of accuracy?

    <p>Method of repetition</p> Signup and view all the answers

    How are vertical angles measured with a theodolite?

    <p>By bisecting P and locking the clamp</p> Signup and view all the answers

    What is the purpose of a traverse in surveying?

    <p>To establish boundaries in property surveys</p> Signup and view all the answers

    How is the average horizontal angle calculated in the method of repetition?

    <p>By dividing the final reading by the number of repetitions</p> Signup and view all the answers

    What is the technique used when a number of angles are to be measured from a station?

    <p>Method of reiteration</p> Signup and view all the answers

    How does the Included Angle method work in surveying?

    <p>By observing and measuring angles incrementally at each point</p> Signup and view all the answers

    What is done at each point where a traverse changes direction?

    <p>An angular measurement is taken using a theodolite</p> Signup and view all the answers

    'Angle of elevations' are noted as ______ angles.

    <p>+ve</p> Signup and view all the answers

    'Angle of depression' are noted as ______ angles.

    <p>-ve</p> Signup and view all the answers

    What does the term 'changing face' refer to?

    <p>Bringing the vertical circle from one side of the observer to the other</p> Signup and view all the answers

    What is the purpose of 'transiting' when using a theodolite?

    <p>To rotate the telescope in a vertical plane through 180 degrees</p> Signup and view all the answers

    What is 'centering' in relation to the theodolite?

    <p>Setting the theodolite exactly over a marked station with a plumb bob</p> Signup and view all the answers

    What is meant by 'line of collimation'?

    <p>Imaginary line passing through the optical center of objective glass and its continuation</p> Signup and view all the answers

    When should Vernier A be read to get the desired horizontal angle?

    <p>When Vernier B reads 180°</p> Signup and view all the answers

    In which case is 'left swing' performed with a theodolite?

    <p>When turning the telescope anticlockwise</p> Signup and view all the answers

    What is 'temporary adjustment' in the context of using a theodolite?

    <p>The setting of the instrument over a station at the time of taking any observation</p> Signup and view all the answers

    'Face right' in the context of using a theodolite means:

    <p>'Vertical circle on the right of observer when taking reading'</p> Signup and view all the answers

    'Horizontal axis' on a telescope refers to:

    <p>'Axis of rotation of telescope in horizontal plane'</p> Signup and view all the answers

    'Swinging the telescope' involves:

    <p>'Turning telescope in horizontal plane'</p> Signup and view all the answers

    What is the formula to calculate interior angles of a traverse?

    <p>(2n-4) x 900</p> Signup and view all the answers

    How is the bearing of a line PQ measured in the text?

    <p>By reading Vernier A when bisecting signal at Q</p> Signup and view all the answers

    What is the purpose of balancing a traverse?

    <p>To adjust for observational errors in a closed traverse</p> Signup and view all the answers

    What does the term 'closing error' refer to in a traverse?

    <p>The distance between the originating station and computed position</p> Signup and view all the answers

    In Bowditch's method, what are CD and CL used for?

    <p>Correct the departure and latitude of a traverse line</p> Signup and view all the answers

    Which component of a line does 'Latitude' refer to in surveying?

    <p>North-south component</p> Signup and view all the answers

    What is Transit Rule commonly used for in surveying?

    <p>To balance a traverse when angular measurements are more precise</p> Signup and view all the answers

    What are the conditions that must be satisfied in a closed traverse regarding Latitude and Departure?

    <p>$ ext{Σ Departure} = ext{ΣD} = 0$ and $ ext{Σ Latitude} = ext{ΣL} = 0$</p> Signup and view all the answers

    'Gal's Traverse Table' typically deals with measuring what in the field?

    <p>Lengths and angles of a closed traverse</p> Signup and view all the answers

    What is the purpose of Gale's Traverse Table?

    <p>To systematically record field data and computations for traverse adjustment</p> Signup and view all the answers

    In the traverse adjustment process, what is done if the sum of all interior angles does not satisfy the geometric conditions?

    <p>Adjust the discrepancy and enter corrections in a specific column</p> Signup and view all the answers

    How are errors distributed to all sides of a traverse when balancing the closing error graphically?

    <p>Errors are distributed proportionally to the distance from the initial station</p> Signup and view all the answers

    What is the significance of marking traverse stations on a horizontal line during graphical balancing?

    <p>To represent the perimeter of the plotted traverse</p> Signup and view all the answers

    Which column in Gale's Traverse Table is used to enter corrections for discrepancies?

    <p>Column 5</p> Signup and view all the answers

    What conditions need to be satisfied by the sum of exterior angles in a traverse?

    <p>(2n + 4) right angles</p> Signup and view all the answers

    What is used to compute independent coordinates of points in a traverse?

    <p>'Known or assumed independent coordinates'</p> Signup and view all the answers

    In graphical balancing, what does shifting equal to Qo Qa represent?

    <p>'Errors at station Qo'</p> Signup and view all the answers

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