Civil Engineering - GATE Exam Questions - Discussion

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

Answer: Option B

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.

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