# Civil Engineering - GATE Exam Questions - Discussion

Discussion Forum : GATE Exam Questions - Section 7 (Q.No. 7)
7.
It is proposed to widen and strengthen an existing 2-lane NH section as a divided highway. The existing traffic in one direction is 2500 commercial vehicles (CV) per day. The construction will take 1 year. The design CBR of soil subgrade is found to be 5 percent, Given: traffic growth rate for CV = 8 percent, vehicle damage factor = 3.5 (standard axles per CV), design life = 10 years and traffic distribution factor = 0.75. The cumulative standard axles (msa) computed are
35
37
65
70
Explanation:
No answer description is available. Let's discuss.
Discussion:
5 comments Page 1 of 1.

Sreejith S said:   2 years ago
Option D is correct. I too agree.

Muneera said:   4 years ago
How A = 2500x1.08?

Govind patidar said:   4 years ago
CSA=(365*(((1+r)^n)-1)*A*D*F)/r.

r=8%.
n=10 years.
A=2500*1.08=2700.
D=lane distribution factor.
F=vehicular damage factor.
CSA=(365*(((1+.08)^10)-1)*2700*0.75*3.5)/0.08 = 37.47msa.

So, that option B is correct.

Niva said:   5 years ago
Option B is correct.

Arnab said:   5 years ago
CSA(N) = 365*(((1+r)^n)-1))/r)*A*D*F.
= 365*(((1+.08)^10)-1))/.08)*(2500*2)*0.75*3.5 = 69.39 msa.
r = 8%
n = 10 years
A = 2500*2 (Two direction)
D = distribution factor
F = VDF = 3.5.

Option D is correct.