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Railways

Q1:

Rail tops of a track are placed

A horizontal

B at an inward slope of 1 in 20

C at an outward slope of 1 in 20

D at an outward slope of 1 in 30

E at an inward slope of 1 in 30

ANS:B - at an inward slope of 1 in 20

Since Wheels are provided with an outward slope of 1:20, that's why we must have to provide the rail top with an inward slope of 1:20.
So that they must balance while the wheels placed on the rail top.

The slope is provided for the purpose of coning which is another separate topic.



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