Elementary Mine Survey Certificate Exam Practice Questions - Elementary Certificate In Mine Survey (South Africa) Exam

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What primary function does the tubular plate level (bubble vial) serve during the setting up of an optical theodolite over a survey peg?

It aligns the vertical axis of the instrument parallel to the direction of gravity. It levels the horizontal crosshair with the target point. It aligns the line of sight along the magnetic meridian. It ensures that the optical plummet line coincides with the trunnion axis.

Correct Answer:

It aligns the vertical axis of the instrument parallel to the direction of gravity.

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