# Civil Engineering - GATE Exam Questions - Discussion

### Discussion :: GATE Exam Questions - Section 1 (Q.No.19)

19.

The ruling minimum radius of horizontal curve of a national highway in plain terrain for ruling design speed of 100 km/hour with e = 0.07 and f = 0.15 is close to

 [A]. 250 m [B]. 360 m [C]. 36 m [D]. 300 m

Explanation:

No answer description available for this question.

 Nikhil said: (Oct 28, 2013) e+f = (v2/127R). 0.07+0.15 = (10000/127R). R = 10000/(127X.22). = 357.90. = 360.

 Samala Laxman said: (Dec 16, 2013) R(ruling radius )= (V^2)/g(e+f). Where V is in m/sec. g = 9.81m/s^2.

 Ajibar Sepai said: (Jan 3, 2015) V = 100km/hr = 100x (1000/3600) m/s = 27.78 m/s; E+f = 0.07+0.15 = 0.22; Now, R = V^2/g (e+f) m/s = 27.78^2/ (9.81*0.22) = 357.52 m/s say, 360 m/s.

 Paresh Purohit said: (Aug 17, 2016) E + f = v^2/127R. E = 0.07, f = 0.15. 100km/hr = 100 * {1000/3600) = 27.8 m/s. So, R = 358.

 Kmpm said: (Jan 16, 2017) Very good explanation @Nikhil.

 Lukesh Kumar said: (Jan 26, 2017) Good explanation. Thank you all.

 Bujjibabu said: (Jul 26, 2017) Thank you for the given explanation.

 Swarnaprava Sahu said: (Jan 5, 2018) Thank you all for the given explanation.

 Satya said: (Jun 1, 2018) Thanks to all for given explanation.

 Shreedevi said: (May 18, 2019) Thank you All for explaining the answer.

 Sourabh Bawa said: (Aug 6, 2019) e+f>= V^2/gR. => (g- gravity 9.81).

 Devesh Thakur said: (May 7, 2020) Absolute maximum radius?

 Er.Rohit Yadav said: (Jul 21, 2020) e+f = v^2/127R so putting value of given data, 0.07+0.15=100^2/127R, R = 10000/127*0.22, = 357.90, = 360.