Rail ज्ञान
  1. Rail ज्ञान
  2. OHE & TRD

Quiz· 10 questions

Quiz: name the OHE part

10 questions: name the part highlighted in the diagram, and see how much you remember from the first two lessons.

In the diagram questions, one part is highlighted with a ?: say what it is. Even if you answer wrong, you’ll see the right answer and the reason straight away.

Questions

  1. 1/10What is the highlighted part?
    Side view of the OHE: poles at both ends, two wires between them, and the track below. The highlighted part, marked with ?: the two tall, straight poles standing at both ends.
    Show answer

    Correct answer: Mast. The mast is the steel pole beside the track that carries the weight of the whole OHE.

  2. 2/10Which wire is highlighted?
    Side view of the OHE: poles at both ends, two wires between them, and the track below. The highlighted part, marked with ?: the lowest wire, perfectly straight and level, with a faint outline of a pantograph below it.
    Show answer

    Correct answer: Contact wire. The contact wire is the lowest, straight wire, the one the pantograph touches.

  3. 3/10Which wire is highlighted?
    Side view of the OHE: poles at both ends, two wires between them, and the track below. The highlighted part, marked with ?: the topmost wire, which sags in the middle between the two poles.
    Show answer

    Correct answer: Catenary wire. The catenary is the topmost wire, which sags between two masts.

  4. 4/10What are these short vertical wires called?
    Side view of the OHE: poles at both ends, two wires between them, and the track below. The highlighted part, marked with ?: the many short vertical wires between the sagging upper wire and the straight lower wire.
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    Correct answer: Dropper. Droppers hang the contact wire from the catenary, so that the contact wire stays straight.

  5. 5/10What is this frame coming out of the mast?
    Side view of the OHE: poles at both ends, two wires between them, and the track below. The highlighted part, marked with ?: the slanted pipes coming out of each pole towards the track, holding both wires.
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    Correct answer: Cantilever. The cantilever holds the catenary and contact wire in the right place, out from the mast.

  6. 6/10What is this highlighted stop on the path of power?
    Picture of the power path: a tall tower on the left, a small building in the middle, wires above the track, and a train on the track. The highlighted part, marked with ?: the small building between the tower and the track, with two linked circles inside.25 kV
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    Correct answer: Traction substation (TSS). The TSS converts the grid's high voltage to 25 kV and feeds it to the OHE.

  7. 7/10What is the highlighted part on top of the loco?
    Picture of the power path: a tall tower on the left, a small building in the middle, wires above the track, and a train on the track. The highlighted part, marked with ?: the slanted frame rising from the train’s roof up to the wire.25 kV
    Show answer

    Correct answer: Pantograph. The pantograph rises from the loco's roof and draws power from the contact wire.

  8. 8/10What does the highlighted part do on the path of power?
    Picture of the power path: a tall tower on the left, a small building in the middle, wires above the track, and a train on the track. The highlighted part, marked with ?: the two parallel rails on the ground, with a short wire running from them to the building.25 kV
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    Correct answer: Carries the current back to the substation. Current returns to the substation through the rail and the ground, which completes the circuit.

  9. 9/10What voltage does the OHE carry on Indian Railways main lines?
    Show answer

    Correct answer: 25 kV AC. Main lines carry 25,000 volt, 50 Hz single-phase AC.

  10. 10/10Why is the contact wire kept at an even height?
    Show answer

    Correct answer: So the pantograph stays in contact even on a fast train. If the height kept changing, the pantograph would bounce and the power would keep breaking.