50 Questions
What is the main purpose of a theodolite?
Measuring angles in horizontal and vertical planes
What is the maximum range of accurate measurement a theodolite can achieve?
20 arc seconds
Which type of theodolite is mounted within one of the standards with a full 360° scale?
Transit theodolite
What is the function of the vertical circle in a theodolite?
Measure vertical angle
What is the purpose of eliminating parallax in a theodolite's telescope?
To reduce errors in angle measurements
Apart from measuring deflection angles, what other use does a theodolite have?
Finding magnetic north direction
What is used to hold the telescope at a particular vertical angle?
Vertical tangent screw
Which component must be leveled before using the instrument?
Upper plate
What is used to center the instrument exactly over a station mark?
Plumb bob
Which part of the instrument houses the foot screws and the bearing for the vertical axis?
Lower plate
What is used for levelling particularly when taking vertical angle observations?
Altitude level
Which component is used to define the horizontal direction in which the telescope is sighted?
Index bar
What is used during a sequence or 'round' of horizontal angle measurements?
Upper horizontal clamp
What is used to gradually rotate the horizontal circle when it is clamped?
Lower horizontal tangent screw
What is placed on the upper plate and known as the plate bubble?
T-frame
What carries two Vernier at its extremities and forms part of T-frame?
Index bar
What is the purpose of transiting in theodolite usage?
Change the face of the instrument
What does 'face left' refer to in the context of theodolite operation?
Vertical circle on the left of the observer
What is the axis of the telescope in theodolite terminology?
Imaginary line through optical center of object glass and eyepiece
What is meant by 'changing face' in the context of theodolite operation?
Bringing the vertical circle from one side to the other
What is 'centering' in theodolite usage?
Setting the instrument exactly over a marked station
What does 'face right' signify when using a theodolite?
Vertical circle on the right of the observer
In theodolite operation, what is temporary adjustment primarily focused on?
Centering, leveling, and focusing
What is 'swinging the telescope' related to in a theodolite?
Turning telescope in a horizontal plane
In a theodolite, what action results from 'line of collimation'?
Imaginary line passing through optical center of objective glass and its continuation.
What does 'vertical axis' represent in a theodolite equipment?
Axis of rotation in vertical plane.
What is recorded in column 4 of Gale's Traverse Table?
Angles
What condition needs to be satisfied by the sum of all interior angles during traverse adjustments?
Equal to (2n - 4) right angles
What should be done if the sum of all exterior angles during the traverse does not meet the geometric conditions?
Adjust the discrepancy
How are corrections applied during traverse adjustments?
By applying corrections to angles
What calculation is made to find the closing error in a traverse?
Summing up latitudes and departures
What rule can be applied to calculate corrections during traverse adjustments?
Bowditch's rule
How are corrections distributed to all sides of a traverse in graphical balancing?
Proportional to their length
What does a horizontal line drawn from Po to P' represent in graphical balancing?
'P' station correction point
'Qo Qa, Ro Ra, So Sa, and To Ta' represent what in graphical balancing corrections?
'Qo, Ro, So, and To' station correction points
'Pa Qa Ra Sa Ta' provide what in graphical balancing of a traverse?
'Qa, Ra, Sa, and Ta' station coordinates after correction
In the method of reiteration, what is done to ensure the sum of the measured angles is 360º?
Unlocking upper clamp and bisecting signals
What is the main purpose of a traverse in surveying?
Measuring horizontal control
How are vertical angles measured in surveying?
By leveling the telescope
What is the purpose of the levelling process described for a theodolite?
To ensure accurate horizontal sight
Which method is used to measure a horizontal angle to a finer degree of accuracy?
Method of repetition
What does sighting a signal at P with zero reading on Vernier A indicate in surveying?
The start of a reiteration method
What is the formula to calculate the sum of interior angles for a traverse?
(2n-4) x 900
What operation is performed to adjust the closing error in a closed traverse?
Balancing
Which method is used for balancing a traverse when angular measurements are more precise than linear measurements?
Transit rule
What is the condition that must be satisfied in a closed traverse regarding departures and latitudes?
$\Sigma D = 0$, $\Sigma L = 0$
Which component of a line represents the north-south direction?
Latitude
What does the term 'closing error' refer to in a closed traverse?
Distance between two computed positions
In which direction is the total error in departure and latitude distributed in Bowditch's method?
Proportionate to line length
What value must $ ext{Σ DT}$ and $ ext{Σ LT}$ satisfy for the transit rule method of balancing a traverse?
$0$
Learn about the theodolite, a precision instrument used for measuring angles in horizontal and vertical planes. Find out about its applications in surveying and specialized purposes, as well as its uses in accurately measuring horizontal and vertical angles.
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