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Which of the following cannot be done with the help of theodolite in surveying?
Laying off horizontal angles
Locating points on lines
Prolonging survey lines
Measuring horizontal distances
Measuring horizontal distances
A theodolite is a precision instrument designed primarily for measuring horizontal and vertical angles ┬╖ While it can determine horizontal distances indirectly via stadia surveying principles, it is not a direct measuring tool for linear distances like a tape or EDM (Electronic Distance Measurement).
A theodolite is a precision instrument designed primarily for measuring horizontal and vertical angles ┬╖ While it can determine horizontal distances indirectly via stadia surveying principles, it is not a direct measuring tool for linear distances like a tape or EDM (Electronic Distance Measurement).
D=KтЛЕs+(f+d) тАФ Indirect distance measurement formula where K=f/i
╬▒=tanтИТ1(HVтАЛ) тАФ Angular calculation for vertical determination
The theodolite uses a telescope mounted on a tripod to precisely sight targets, allowing for the measurement of angles using horizontal and vertical graduated circles ┬╖ In tacheometric surveying, it measures stadia intercepts (s) on a staff to estimate distance D using D=KтЛЕs+C, where K and C are the stadia interval factor and the additive constant ┬╖ Because this relies on optical principles rather than physical displacement measurement, it is categorized as an angular/indirect instrument.
Theodolite is primarily an angle-measuring instrument.
Horizontal distances can only be measured indirectly through tacheometry.
Direct distance measurement requires physical chains, tapes, or EDM devices.
Laying off angles and prolonging lines are standard theodolite operations.
High precision in horizontal and vertical angular measurements.
Capable of performing complex traverse surveys.
Can be used for leveling and setting out works.
Not intended for direct linear measurement.
Requires skilled operation and precise centering/leveling.
Slower than modern Total Stations for coordinate extraction.
Triangulation and traverse surveying.
Setting out alignment for roads and railways.
Topographic mapping and contouring.
Theodolite operations include: 1 ┬╖ Measuring horizontal angles, 2 ┬╖ Measuring vertical angles, 3 ┬╖ Prolonging survey lines, 4 ┬╖ Locating points, 5 ┬╖ Levelling.
Option D is incorrect because direct horizontal distance measurement is the function of surveying chains or tapes, not a theodolite.
D is correct тАФ A theodolite is an angular measuring instrument and does not perform direct horizontal distance measurements, which is the function of tapes or chains.
Always remember that in exams, 'direct' vs 'indirect' measurement is a key distinction; theodolites are synonymous with angles, not linear measurement.