Railway Engineering
The following tests are conducted for rails:i) falling weight testii) tensile testiii) hammer testThe compulsory tests are

(ii) and (iii)
(i)and(ii)
only (i)
(i) and (iii)

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Railway Engineering
A triangle is used for

Separating all the sidings and shunting lines from main lines
Preventing the vehicles from running off the track
Transferring wagons to and from parallel tracks without shunting
Changing the direction of engine

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