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Tunnelling
Pick up the explosive used for tunnelling in soft rocks from the following :
blasting gelatine
special gelatine
ammonia dynamite
semi-gelatine.
Correct Answer:
ammonia dynamite
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Tunnelling
Which one of the following statements is not correct in respect of setting of an inclined tunnel:
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The length of the needle beam used in needle beam method of tunnelling is usually
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In case of drift method of tunnelling, the drift may be excavated at
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