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Which of the following is/are the main advantage of using a dumpy level in surveying? i) Simple to use ii) Provides accurate level of reading iii) Can be used at night, without light
Only i
Both i and ii
Only ii
Only iii
Both i and ii
A dumpy level is a classic surveying instrument consisting of a telescope fixed securely to the leveling head. Its main advantages are its simple construction and high reliability in providing accurate level readings during standard surveying operations.
IS 5651:1970
A dumpy level is a classic surveying instrument consisting of a telescope fixed securely to the leveling head. Its main advantages are its simple construction and high reliability in providing accurate level readings during standard surveying operations.
Reduced┬аLevel=Height┬аof┬аInstrumentтИТStaff┬аReading
Height┬аof┬аInstrument=Bench┬аMark+Backsight┬аReading
The dumpy level operates on the principle of establishing a horizontal line of sight perpendicular to the gravity vector (plumb line). This is achieved by adjusting foot screws to center a bubble in a spirit level, ensuring the vertical axis is perfectly plumb and the telescope rotates in a truly horizontal plane.
Dumpy levels have fewer moving parts compared to tilting or automatic levels, making them less prone to mechanical error.
The telescope is rigidly fixed to the leveling head, which enhances stability.
Accuracy is maintained through frequent calibration of the plate levels.
Optical leveling requires ambient light for reading the graduation marks on the leveling staff.
Simple, rugged construction
High durability and ease of maintenance
Reliable accuracy for standard leveling
Cannot be used in low-light conditions
Requires leveling for every change in instrument position
Slower operation compared to automatic levels
Construction surveying
Road alignment leveling
Topographic mapping
Dumpy levels are strictly optical instruments; they require sufficient natural or artificial light to distinguish staff readings, invalidating statement iii.
Option B is the correct choice as both simplicity and accuracy are defining characteristics of the dumpy level design.
B is correct тАФ The dumpy level is noted for its simplicity and accuracy, while it cannot function without light.
Always remember that optical surveying instruments rely on the human eye; if the question mentions night operations, it likely refers to electronic or laser-based devices, not standard dumpy levels.
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