GATE CE 2024 Set 2 — Question 27
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Transportation Engineering → Airport Engineering → Gradient Correction
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Question
The longitudinal sections of a runway have gradients as shown in the table.
Consider the reduced level (RL) at the starting point of the runway as 100 m. The effective gradient of the runway is
| End to end for sections of runway (m) | Gradient (%) |
|---|---|
| 0 to 200 | +1.0 |
| 200 to 600 | -1.0 |
| 600 to 1200 | +0.8 |
| 1200 to 1600 | +0.2 |
| 1600 to 2000 | -0.5 |
Correct answer
(C) 0.28%
Solution
The effective gradient is defined as the ratio of the maximum difference in elevation (RL) to the total length of the runway.
1.Calculate RL at each change point:
- m
- m
- m
- m
- m
- m
- Maximum RL = 103.6 m
- Minimum RL = 98.0 m
- Maximum difference = m
- Total Length = 2000 m
- Effective Gradient =
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