search
arrow-left Previous
Next arrow-right
Q: In secondary triangulation, the maximum triangle closure is:
  • A. 10 sec
  • B. 3 sec
  • C. 8 sec
  • D. 12 sec
Correct Answer: Option C - Second order or secondary triangulation– The secondary triangulation consists of a number of points fixed within the framework of primary triangulation. The stations are fixed at close intervals so that the sizes of the triangles formed are smaller than the primary triangulation. • Average triangle closure – 3 sec • Maximum triangle closure – 8 sec • Length of base line – 1.5 to 5 km Third-order or tertiary triangulation– The third-order triangulation consists of number of points fixed within the framework of secondary triangulation and forms the immediate control for detailed engineering and other surveys. • Average triangle closure – 6 sec • Maximum triangle closure – 12 sec • Length of base line – 0.5 to 3 km
C. Second order or secondary triangulation– The secondary triangulation consists of a number of points fixed within the framework of primary triangulation. The stations are fixed at close intervals so that the sizes of the triangles formed are smaller than the primary triangulation. • Average triangle closure – 3 sec • Maximum triangle closure – 8 sec • Length of base line – 1.5 to 5 km Third-order or tertiary triangulation– The third-order triangulation consists of number of points fixed within the framework of secondary triangulation and forms the immediate control for detailed engineering and other surveys. • Average triangle closure – 6 sec • Maximum triangle closure – 12 sec • Length of base line – 0.5 to 3 km

Explanations:

Second order or secondary triangulation– The secondary triangulation consists of a number of points fixed within the framework of primary triangulation. The stations are fixed at close intervals so that the sizes of the triangles formed are smaller than the primary triangulation. • Average triangle closure – 3 sec • Maximum triangle closure – 8 sec • Length of base line – 1.5 to 5 km Third-order or tertiary triangulation– The third-order triangulation consists of number of points fixed within the framework of secondary triangulation and forms the immediate control for detailed engineering and other surveys. • Average triangle closure – 6 sec • Maximum triangle closure – 12 sec • Length of base line – 0.5 to 3 km