# Civil Engineering - Airport Engineering - Discussion

### Discussion :: Airport Engineering - Section 2 (Q.No.15)

15.

The length of a runway under standard atmospheric conditions is 1800 m. If the actual reduced level of the site is 1200 m, the design length of the runway is

 [A]. 2360 m [B]. 2460 m [C]. 2560 m [D]. 2660 m

Explanation:

No answer description available for this question.

 Mahesh said: (Mar 9, 2015) Correct length may be = 1800+1800*0. 07*1200/300 = 2430 m. So answer must be B.

 Abiral Bhattarai said: (Jun 24, 2015) 7/300*1200 = 28. 28/100*1800+1800 = 2304. So correct answer is 2304 which is not in option.

 Satheesh said: (Jan 21, 2016) 1800*1.07^4 = 2359.6.

 Pvn said: (Feb 24, 2017) Give the correct explanation for this question.

 Atik said: (Apr 18, 2017) @Mahesh. Check your calculation. It comes 2304 not 2430.

 Rabindra said: (Apr 7, 2018) Please explain the solution.

 Rabindra said: (Apr 7, 2018) (7/100)*1800*(1200/300)=504. 1800+504=2404.

 Rabindra said: (Apr 8, 2018) I think the Correct answer is D.

 Niraj said: (Jun 3, 2018) Guys, I think 6.5°C rise per 1000m elevation. And 1% increase in length per °C rise in temperature (standard temp. at sea level is 15°C) should also be considered.

 Aswin said: (Jan 20, 2020) The Correction for elevation and temp exceeds 35%. And Answer I got is 2484m.

 Suraj said: (Jan 26, 2020) @All. Listen me! The Correct answer is A. Because everytime I am calculated 7percent of length of runway and answer added to length. So next time 7 percent of new lenght calculated and added. This process continued for 4 times. Because every 300 m rise length increases 7 percent. Here is 1200 m rise so we take 4 times.

 Lav Yadav said: (Apr 11, 2020) I agree and thanks @Abiral Bhattarai and @Suraj.

 Shiva Bhandari said: (Apr 30, 2020) 7/300*1800=42%. (42/100*1800)+1800, 756+1800. 2556 ~2560 is the right answer.

 Naga said: (Apr 17, 2021) 7% increase in length for every 300m rise, So for 1200 m its 4 times 300 m. Therefore .28*1800 = 504. So total increase in length 504+1800=2304m. So the given answer is wrong.

 Narendra Bishwokarma said: (Jul 28, 2021) I agree with you @Suraj & @Nega.