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Q1: Pick up the correct statement from the following :

A the tangent screw enables to give small movement under conditions of smooth and positive control

B standing on the tripod is the levelling head or trib arch

C the levelling screws are used to tilt the instrument so that its rotation axis is truly vertical

D all the above.

ANS:D - all the above.

The theodolite is supported on the tripod stand with the help of levelling head. It consists of tribach, levelling screw, trivet. An electronic instrument also stability used the tangent screw.



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