All India Civil Engineering (CE) Group

The resected position of plane-table station from three known position is unreliable if the station lies
  • a)
    in the great triangle
  • b)
    on circumference of circumscribing circle
  • c)
    outside the great triangle
  • d)
    in the centre of the circumscribing circle
Correct answer is option 'B'. Can you explain this answer?

Rajesh Gundeti answered  •  2 hours ago
If the station lies on the circle of any side of the triangle, then the position of 3rd known point is far when compared to the other points. The longer the length, the more is the chance for error to arise. This makes the station point on the circumference of the circumscribing circle unreliable because of high chance for error in chaining.
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