Question

ACQ (100)
Q56. The main purpose of welding rails is to
(A) Build up worn-out parts of points and crossing
(B) Build up the battered or worn heads of rail ends
(C) To rebuild those portions of rail ends, which are
burnt due to slipping of wheels at the time of
applying brakes
(D) All of the above​

Answer 1

Answer:

all of the above

Explanation:

as welding main task is to build up worn-out parts

but it can also be uesd to for option (B) and (C) too.

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Answer 2

The correct option is (D) All of the above​

The main purpose of welding rails is to Build up worn-out parts of points and crossing, Build up the battered or worn heads of rail ends, To rebuild those portions of rail ends, which are  burnt due to slipping of wheels at the time of  applying brakes.

Extra Information:

Thermit Welding =>

1. Thermit welding is done for welding rails. Thermit welding is also known as Exothermic welding or exothermic bonding.

2. During this welding process molten metal is poured in the gap to join the conductors permanently.

3. The reaction which happens is called thermite reaction.

Fe₂O₃   +   2Al             =>     Al₂O₃         +    2Fe

Iron            Aluminium         Aluminium       Iron

Oxide                                    Oxide

4. In the reaction Aluminium reduces oxide of Iron Oxide(it can be other metal too) and we gain products which are Aluminium Oxide and large amount of heat.