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Q1: If θ is the vertical angle of an inclined sight, δ is the angle of tilt of the staff, the error

A

B

C

D none of these.

ANS:A -

I think the tilt angle of staff delta is positive when it's away from the tachometer and negative when towards tachometer. E is an error. The staff reading component on the normal (true) axis will be +/- cos δ. Hence the expression governed by cosine values, that is Option A.



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