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What is the purpose of providing marshalling yards? What are the main siding
features of marshalling yards? Support your answers with appropriate figures.
What is packing? Explain the three different types of packing
PART C

Answer any two full questions, each carries 20 marks.
Explain the three systems of mechanical ventilation of a tunnel with neat sketch.
How do you classify harbours? Explain in detail
List out different methods of tunnelling in hard rocks. Explain any one of the
method.
Discuss the three methods of mound construction.
Draw neat sketch and explain the forces created due to wave action against a
marine structure. What are the phenomena occurring due to these forces?

Explain the four different stages in setting out the centre line of tunnel.

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