Module 4

Question 1

Advantages of chain surveying (4)

Answer 1

Method is easily mastered

Amount of apparatus required is minimal

Not an expensive method

Location of details is performed to a high degree of accuracy

Question 2

Disadvantage of chain surveying ((4)

Answer 2

Wrong booking can occur

It is a laborious task

It takes a long time

Measurements could be entered on the wrong side of the chain line

Question 3

Advantages of chain (6)

Answer 3

It’s is a robust material

Can be dragged along ground

Easily read

Easily cleaned

Easily repaired

It can be used from both sides

Question 4

Factors that make tape permanently incorrect (5)

Answer 4

Permanent shrinkage due to defects of material

Execesive tension

Short piece broken off

Piece added on

Knot due to temporary repair

Question 5

Neat sketch of

Answer 5

Bonning rod - T

Sight rail - H

Leveling staff E

Range rod !!

Question 6

Advantages of steel tape (3)

Answer 6

Light and compact

Easy to read

Fairly accurate

Question 7

Disadvantage of steel tape (4)

Answer 7

Breaks easily as they are brittle

Libel to rust so continue maintence

It’s stretches more easily

It is difficult to repair easily

Question 8

EDM

Answer 8

Electro distance measuring instrument that is place at one end and transmit electro magnetic waves to a retro-reflector positioned on the other end.