Section 4: Soil and Water Conservation Engineering
Surveying and Levelling
Subtopic: Measurement of angles and bearings
Question Statement:
Which adjustments are classified as 'temporary adjustments' of a transit theodolite performed at each setup station?
Options:
(A) Setting up and centring over the station peg using a plumb bob or optical plummet
(B) Levelling the instrument using plate level vials and footscrews
(C) Elimination of parallax by focusing the eyepiece and objective lens
(D) Straightening a bent telescope trunnion axis
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
Centring, levelling, and elimination of parallax are temporary adjustments performed at every setup. Straightening mechanical axes is a permanent adjustment.