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Surveying - Engineering

Q1:

If + 0.8% grade meets - 0.7% grade and the rate of change of grade for 30 m distance is 0.05, the length of the vertical curve will be

A 600 m

B 700 m

C 800 m

D 900 m

E 1000 m

ANS:D - 900 m

= (0.8-(-0.7)) = 1.5,
then,1.5 * 30 = 45
then, 45/0.05= 900.

The length of the vertical curve = 900. =(0.8-(-0.7))=1.5
then,1.5 * 30=45
then, 45/0.05=900.
the length of the vertical curve =900. (g1-g2)÷ g per meter length,
[0.8-(-0.7)]÷(0.05/30)= 900 m.