GATE CE 2017 Set 1 — Question 35
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Geomatics Engineering → Principles of Surveying → Compass Surveying
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Question
The observed bearings of a traverse are given below:
The station(s) most likely to be affected by the local attraction is/are
| Line | Bearing | Line | Bearing |
|---|---|---|---|
| PQ | QP | ||
| QR | RQ | ||
| RS | SR | ||
| ST | TS |
- A.Only R
- B.Only S
- C.R and S
- D.P and Q
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Correct answer
(MARK TO ALL)
Solution
To identify stations affected by local attraction, we check the difference between the Fore Bearing (FB) and Back Bearing (BB) for each line. A difference of exactly indicates that both stations of that line are likely free from local attraction.
1.Line PQ: . Stations P and Q are free from local attraction.
2.Line QR: . Since Q is free, station R is also free from local attraction.
3.Line RS: . Since station R is known to be free, the error must be at station S. Thus, station S is affected by local attraction.
4.Line ST: . Since station S is affected, station T must also be affected by the same amount of local attraction to maintain the difference.
Conclusion: Stations S and T are affected by local attraction. Since this specific combination is not provided in the options, the question was awarded 'Mark to All' in the official key.Continue learning with Success Tracker
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