GATE CE 2021 Set 1 — Question 64
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Transportation Engineering → Airport Engineering → Gradient Correction
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Question
The longitudinal section of a runway provides the following data:
The effective gradient of the runway (in %, round off to two decimal places) is ________.
| End-to-end runway (m) | Gradient (%) |
|---|---|
| 0 to 300 | + 1.2 |
| 300 to 600 | - 0.7 |
| 600 to 1100 | + 0.6 |
| 1100 to 1400 | - 0.8 |
| 1400 to 1700 | - 1.0 |
Correct answer
0.3 to 0.34
Solution
Effective gradient is defined as the ratio of the maximum difference in elevation to the total length of the runway.
Let the elevation at the start () be .
Elevation at
Elevation at
Elevation at
Elevation at
Elevation at Maximum elevation =
Minimum elevation =
Maximum difference in elevation =
Total length =
Effective gradient =
Let the elevation at the start () be .
Elevation at
Elevation at
Elevation at
Elevation at
Elevation at Maximum elevation =
Minimum elevation =
Maximum difference in elevation =
Total length =
Effective gradient =
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