The length of capsule is
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Mining Engineering · all questionsMine Supports and Strata Control
Mine Supports and Strata Control
practice.
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320
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The stress cells are used to measure . . . . . . . . in u/g mines.
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Subsidence can be controlled by
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What is an under set prop.
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The unseasoned timber called as
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Roof bolts principle action depend on
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The bolts used in mines are
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Width of flat piece is . . . . . . . . used for setting props.
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Highest rank of coal, Anthracite have
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Coal with volatile matter of about . . . . . . . .% have the lowest UCS.
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Any clay or shale which does not fuse, below 158°C called
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Number of holes required to errect a timber bar
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Chock shields can work in steeply inclined seams upto maximum . . . . . . . . deg.
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Bulk strength of the timber prop is . . . . . . . . kg/cm2.
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If the prop has to be set on loose rock, it should be placed on . . . . . . . .
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The pressure arch in longwall workings have its apex or crest at a mm height above the seam at nearly . . . . . . . . times the length of face.
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First aid certificate is not required for
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The load does not effect the load yeild characteristic of the prop.
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In which contains separated pre-measured quantity of filled polyestered and resin catalyst called
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Timber bar placed in the holes of minimum depth of . . . . . . . .
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