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Q: In chain surveying a tie line is primarily provided
  • A. To increases the number of chain lines
  • B. To take offsets for detail survey
  • C. To check the accuracy of the survey
  • D. To avoid long offset from chain lines
Correct Answer: Option D - Tie line or subsidiary line– A tie line is a line which joins subsidiary or tie stations on the main line. The main object of running a tie line is to take the details of nearby objects but it also serves the purpose of a check line. These are also called auxiliary line. • In chain survey, tie line are provided to take the details of nearby objects and avoid long offsets. • Tie lines are provided to locate the interior details which are far away from the main survey lines.
D. Tie line or subsidiary line– A tie line is a line which joins subsidiary or tie stations on the main line. The main object of running a tie line is to take the details of nearby objects but it also serves the purpose of a check line. These are also called auxiliary line. • In chain survey, tie line are provided to take the details of nearby objects and avoid long offsets. • Tie lines are provided to locate the interior details which are far away from the main survey lines.

Explanations:

Tie line or subsidiary line– A tie line is a line which joins subsidiary or tie stations on the main line. The main object of running a tie line is to take the details of nearby objects but it also serves the purpose of a check line. These are also called auxiliary line. • In chain survey, tie line are provided to take the details of nearby objects and avoid long offsets. • Tie lines are provided to locate the interior details which are far away from the main survey lines.