Question

What should be the actual ruling gradient if on a B.G. track a ruling gradient of 1 in 250 has been fixed and a 3${}^o$ horizontal curve is also superimposed in the above track?

• A. 1 in 180
• B. 1 in 357
• C. 1 in 460
• D. 1 in 250

Answer 1

The correct option is B 1 in 357

The grade compensation of B.G. track allowed = 0.04% per degree curve
Compensation for $3^{o}curve=0.04\times 3=0.12\%$
Whereas ruling gradient provided = 1 in 250 = 0.4%
Actual ruling gradient to be used = 0.4 - 0.12 = 28%

$=\frac{0.28}{100}=\frac{1}{\left(100/0.28\right)}=$ 1 in 357