Question

If N is the number of sides of a closed traverse, then select the INCORRECT checks applied on a closed traverse
1. The sum of measured exterior angles should be equal to (2N + 4) right angles
2. The fore bearing of the last line should be equal to its back bearing ± 180° measured at the initial station.
3. The sum of measured exterior angles should be equal to the sum of measured interior angles
4. The sum of measured interior angles should be equal to (2N - 4) right angles

Answer 1

Correct Answer - Option 3 : The sum of measured exterior angles should be equal to the sum of measured interior angles

Concept:

Linear and angular are the two errors involved in traversing. Hence the following checks are done for angular measurements

Angular work	Checks in angles
Sum of interior angles	(2N - 4)× 90º
Sum of exterior angles	(2N + 4)× 90º
Sum of deflection angles	360º
Fore bearing	Back bearing ± 180º

 Here N is the number of sides of the traverse

• While calculating deflection angles, Right-handed deflection angles are taken as positive and Left-hand angles are taken as negative.