railway DFCCIL Executive 2025 Mock Test Surveying Compass Surveying and Theodolite

Spire test is to check which of the following permanent adjustments of the theodolite?

1
Plate level axis is perpendicular to vertical axis
2
Horizontal axis is perpendicular to vertical axis
3
The line of sight coincides with the optical axis of the telescope
4
The axis of the altitude level is parallel to the line of sight
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