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

Answer: Option C

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.

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