Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > In levelling operation,a)The first sight on a...
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In levelling operation,
- a)The first sight on any change point is a back sight
- b)The second sight on any change point is a fore sight
- c)The line commences with a fore sight and closes with a back sight
- d)The line commences with a back sight and closes with a foresight
Correct answer is option 'D'. Can you explain this answer?
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In levelling operation,a)The first sight on any change point is a back...
In levelling operation if the change point reduced level is known as a control point. Then, taking backsight is not required.
The second sight may be intermediate sight or backsight.
For a line to be drawn commencement is done with a backsight and closes with foresight in levelling
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In levelling operation,a)The first sight on any change point is a back...
Levelling Operation
Levelling is a surveying technique used to determine the height or elevation of different points on the Earth's surface. It is an essential operation in civil engineering, construction, and land surveying. The levelling operation involves measuring vertical distances or elevations using a levelling instrument, such as a dumpy level or a digital level.
Back Sight and Fore Sight
In levelling, the terms "back sight" and "fore sight" are used to describe the different types of measurements taken during the levelling operation. These measurements help in determining the differences in elevation between different points.
- Back Sight: The back sight is the first sight taken on a change point. It is a measurement taken on a point of known elevation or a point whose elevation has been previously determined. The back sight is used to establish a reference height or benchmark for subsequent measurements.
- Fore Sight: The fore sight is the second sight taken on a change point. It is a measurement taken on a point whose elevation is to be determined. The fore sight is used to measure the height difference between the back sight and the change point.
Sequence of Sight Measurements
The correct sequence of sight measurements in levelling is crucial for accurate elevation determination. The correct sequence is as follows:
1. Back Sight: The levelling operation begins with a back sight measurement. The back sight is taken on a point of known elevation or a benchmark.
2. Intermediate Sight: Intermediate sights can be taken between the back sight and the fore sight if necessary. These sights help in determining the elevation of intermediate points along the levelling line.
3. Fore Sight: The levelling operation concludes with a fore sight measurement. The fore sight is taken on a point whose elevation needs to be determined.
Line Closure
The line closure refers to the process of checking the accuracy of the levelling operation by comparing the sum of the back sight and intermediate sight measurements with the sum of the fore sight measurements.
- If the line commences with a back sight and closes with a fore sight: In this case, the sum of the back sights and intermediate sights should be equal to the sum of the fore sights. This indicates that the levelling line is closed and the measurements are accurate.
Therefore, the correct answer is option 'D' - The line commences with a back sight and closes with a fore sight. This sequence ensures the accuracy of the levelling operation and allows for proper elevation determination.
Levelling is a surveying technique used to determine the height or elevation of different points on the Earth's surface. It is an essential operation in civil engineering, construction, and land surveying. The levelling operation involves measuring vertical distances or elevations using a levelling instrument, such as a dumpy level or a digital level.
Back Sight and Fore Sight
In levelling, the terms "back sight" and "fore sight" are used to describe the different types of measurements taken during the levelling operation. These measurements help in determining the differences in elevation between different points.
- Back Sight: The back sight is the first sight taken on a change point. It is a measurement taken on a point of known elevation or a point whose elevation has been previously determined. The back sight is used to establish a reference height or benchmark for subsequent measurements.
- Fore Sight: The fore sight is the second sight taken on a change point. It is a measurement taken on a point whose elevation is to be determined. The fore sight is used to measure the height difference between the back sight and the change point.
Sequence of Sight Measurements
The correct sequence of sight measurements in levelling is crucial for accurate elevation determination. The correct sequence is as follows:
1. Back Sight: The levelling operation begins with a back sight measurement. The back sight is taken on a point of known elevation or a benchmark.
2. Intermediate Sight: Intermediate sights can be taken between the back sight and the fore sight if necessary. These sights help in determining the elevation of intermediate points along the levelling line.
3. Fore Sight: The levelling operation concludes with a fore sight measurement. The fore sight is taken on a point whose elevation needs to be determined.
Line Closure
The line closure refers to the process of checking the accuracy of the levelling operation by comparing the sum of the back sight and intermediate sight measurements with the sum of the fore sight measurements.
- If the line commences with a back sight and closes with a fore sight: In this case, the sum of the back sights and intermediate sights should be equal to the sum of the fore sights. This indicates that the levelling line is closed and the measurements are accurate.
Therefore, the correct answer is option 'D' - The line commences with a back sight and closes with a fore sight. This sequence ensures the accuracy of the levelling operation and allows for proper elevation determination.
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In levelling operation,a)The first sight on any change point is a back sightb)The second sight on any change point is a fore sightc)The line commences with a fore sight and closes with a back sightd)The line commences with a back sight and closes with a foresightCorrect answer is option 'D'. Can you explain this answer?
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In levelling operation,a)The first sight on any change point is a back sightb)The second sight on any change point is a fore sightc)The line commences with a fore sight and closes with a back sightd)The line commences with a back sight and closes with a foresightCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about In levelling operation,a)The first sight on any change point is a back sightb)The second sight on any change point is a fore sightc)The line commences with a fore sight and closes with a back sightd)The line commences with a back sight and closes with a foresightCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In levelling operation,a)The first sight on any change point is a back sightb)The second sight on any change point is a fore sightc)The line commences with a fore sight and closes with a back sightd)The line commences with a back sight and closes with a foresightCorrect answer is option 'D'. Can you explain this answer?.
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