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CivilAdvanced Survey
PrevNext

Which instrument is precise and speedy in survey?

A

Theodolite

B

Plan table

C

Compass

D

All of the above

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleCivilAdvanced Survey
Option A

Theodolite

Quick Summary:

The theodolite is the most precise instrument for surveying as it measures both horizontal and vertical angles with high accuracy, typically down to seconds. Due to its advanced optical systems and mechanical precision, it is the preferred tool for high-order control surveys and setting out complex engineering structures.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

The theodolite is the most precise instrument for surveying as it measures both horizontal and vertical angles with high accuracy, typically down to seconds. Due to its advanced optical systems and mechanical precision, it is the preferred tool for high-order control surveys and setting out complex engineering structures.

ЁЯФв Key Formulas

d=DтЛЕcosтБб2╬╕d = D \cdot \cos^2 \thetad=DтЛЕcos2╬╕ тАФ distance measurement component

V=DтЛЕ12sinтБб(2╬╕)V = D \cdot \frac{1}{2} \sin(2\theta)V=DтЛЕ21тАЛsin(2╬╕) тАФ vertical height component

тЪЩя╕П Working Principle

The theodolite utilizes a telescope mounted on a dual-axis system (horizontal and vertical) with graduated circular plates. Angular measurements are obtained by aligning the line of sight with targets and reading the vernier or micrometer scales, which provide precise readings of the rotation angles.

ЁЯУМ Key Points
  • тЦ╕

    Theodolites offer the highest degree of angular measurement accuracy compared to compass or plane table surveys.

  • тЦ╕

    Used extensively for traverse surveying, triangulation, and setting out curves.

  • тЦ╕

    Modern electronic theodolites (Total Stations) integrate distance measurement for extreme speed and efficiency.

тЬЕ Advantages
  • тЦ╕

    High precision for angular measurements

  • тЦ╕

    Versatility in measuring both horizontal and vertical angles

  • тЦ╕

    Ability to perform sub-tended distance measurement

тЭМ Disadvantages / Limitations
  • тЦ╕

    High cost compared to basic compasses

  • тЦ╕

    Requires skilled operator to handle complex adjustments

  • тЦ╕

    Susceptible to errors from improper leveling

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Construction of high-rise structures

  • тЦ╕

    Large-scale triangulation and control surveying

  • тЦ╕

    Setting out alignment for highways and railways

ЁЯФД Comparison Table
FeatureTheodoliteCompass/Plane Table

Precision

Very High

Low to Moderate

ЁЯУД Additional Information
  • тЦ╕

    Plane table surveying is a graphical method and is generally less precise for complex control work.

  • тЦ╕

    Compass surveying is primarily for rough reconnaissance and is prone to magnetic interference.

ЁЯУК Diagram / Illustration
Theodolite Precision EquationAngular Precision (╬▒)
LeastCountTotalMeasurements(Least Count / Total Measurements)TotalMeasurementsLeastCountтАЛ
тЬЕ

A is correct тАФ The theodolite is the most precise and efficient instrument for angular measurement in standard surveying workflows.

Core Concepts Used
Click any tag to open in AI Tutor
Angular Surveying Trigonometric Leveling Instrumentation Precision
ЁЯТб EXAM TIP

Always remember that while theodolites excel in precision, Total Stations are the industry standard for speed as they combine electronic theodolites with EDM (Electronic Distance Measurement).

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