GATE CE 2020 Set 1 — Question 31
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Transportation Engineering → Horizontal & Vertical Alignment → Gradient
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Question
A road in a hilly terrain is to be laid at a gradient of 4.5%. A horizontal curve of radius 100 m is laid at a location on this road. Gradient needs to be eased due to combination of curved horizontal and vertical profiles of the road. As per IRC, the compensated gradient (in %, round off to one decimal place), is ___________.
Correct answer
4 to 4
Solution
Grade compensation () is provided on horizontal curves to reduce the tractive effort required.
As per IRC standards:
Compensated Gradient = Ruling Gradient - .
However, IRC specifies that the compensated gradient should not be less than 4.0 %.
Since , the compensated gradient to be provided is 4.0 %.
As per IRC standards:
1.
2.Maximum
We take the smaller value, so .Compensated Gradient = Ruling Gradient - .
However, IRC specifies that the compensated gradient should not be less than 4.0 %.
Since , the compensated gradient to be provided is 4.0 %.
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