Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > In levelling, height of instrument meansa)hei...
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In levelling, height of instrument means
- a)height of telescops from the ground whereinstrument is set
- b)level of the point with respect to assumeddatum
- c)it is the elevation of plane of sight from theassumed datum
- d)none of the above
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
In levelling, height of instrument meansa)height of telescops from the...
A surveying term used in spirit leveling for the height of the line of sight of a leveling instrument above the adopted datum, in trigonometric leveling for the height of the center of the theodolite above the ground or station mark, in stadia surveying for the height of the center of the telescope of the transit or ...In levelling, height of instrument means it is the elevation of plane of sight from theassumed datum
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In levelling, height of instrument meansa)height of telescops from the...
Explanation:
Height of instrument is an important factor in levelling. It refers to the elevation of the plane of sight above the assumed datum. The assumed datum is usually the level of the benchmark or the starting point from where the levelling is carried out. The height of instrument is determined by measuring the vertical distance between the benchmark and the plane of sight.
The height of instrument is used to determine the elevation of other points in the survey area. When the height of instrument is known, the elevation of a point can be determined by measuring the vertical distance between the point and the plane of sight.
The following points explain the meaning of height of instrument in levelling:
- Definition: The height of instrument is the elevation of the plane of sight above the assumed datum.
- Assumed datum: The assumed datum is the level of the benchmark or the starting point from where the levelling is carried out.
- Plane of sight: The plane of sight is the horizontal plane through the centre of the telescope when the bubble is centred.
- Elevation of points: The elevation of a point can be determined by measuring the vertical distance between the point and the plane of sight.
- Importance: The height of instrument is an important factor in levelling as it is used to determine the elevation of other points in the survey area.
Therefore, option C is the correct answer.
Height of instrument is an important factor in levelling. It refers to the elevation of the plane of sight above the assumed datum. The assumed datum is usually the level of the benchmark or the starting point from where the levelling is carried out. The height of instrument is determined by measuring the vertical distance between the benchmark and the plane of sight.
The height of instrument is used to determine the elevation of other points in the survey area. When the height of instrument is known, the elevation of a point can be determined by measuring the vertical distance between the point and the plane of sight.
The following points explain the meaning of height of instrument in levelling:
- Definition: The height of instrument is the elevation of the plane of sight above the assumed datum.
- Assumed datum: The assumed datum is the level of the benchmark or the starting point from where the levelling is carried out.
- Plane of sight: The plane of sight is the horizontal plane through the centre of the telescope when the bubble is centred.
- Elevation of points: The elevation of a point can be determined by measuring the vertical distance between the point and the plane of sight.
- Importance: The height of instrument is an important factor in levelling as it is used to determine the elevation of other points in the survey area.
Therefore, option C is the correct answer.
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In levelling, height of instrument meansa)height of telescops from the ground whereinstrument is setb)level of the point with respect to assumeddatumc)it is the elevation of plane of sight from theassumed datumd)none of the aboveCorrect answer is option 'C'. Can you explain this answer?
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