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Q: Select the INCORRECT obstacle in chaining in a chain survey :
  • A. Obstacle to ranging only
  • B. Obstacle to chaining only
  • C. Obstacle to plotting
  • D. Obstacle to both chaining and ranging
Correct Answer: Option C - Obstacle to plotting is not any type of obstacle in chain surveying. Obstacles to both chaining and ranging– A building is the typical example of this type of obstacle. The problem lies in prolonging the line beyond the obstacle and determining the distance across it. Obstacle to chaining but not ranging– When it is possible to chain round the obstacle i.e, a pond, hedge etc. • When it is not possible to chain round the obstacle e.g. river. Obstacle to ranging but not chaining– • Both ends of the line may be visible from intermediate points on the line. • Both ends of the line may not be visible from intermediate points on the line.
C. Obstacle to plotting is not any type of obstacle in chain surveying. Obstacles to both chaining and ranging– A building is the typical example of this type of obstacle. The problem lies in prolonging the line beyond the obstacle and determining the distance across it. Obstacle to chaining but not ranging– When it is possible to chain round the obstacle i.e, a pond, hedge etc. • When it is not possible to chain round the obstacle e.g. river. Obstacle to ranging but not chaining– • Both ends of the line may be visible from intermediate points on the line. • Both ends of the line may not be visible from intermediate points on the line.

Explanations:

Obstacle to plotting is not any type of obstacle in chain surveying. Obstacles to both chaining and ranging– A building is the typical example of this type of obstacle. The problem lies in prolonging the line beyond the obstacle and determining the distance across it. Obstacle to chaining but not ranging– When it is possible to chain round the obstacle i.e, a pond, hedge etc. • When it is not possible to chain round the obstacle e.g. river. Obstacle to ranging but not chaining– • Both ends of the line may be visible from intermediate points on the line. • Both ends of the line may not be visible from intermediate points on the line.