Q281
Open questionIn a seam with loco haulage system the junctions with main haulage are staggered.
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Mining Engineering · all questionsCoal Mining
Coal Mining
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Q282
Open questionHow many coal seams belong to Barakar formation
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Q283
Open questionLimiting gradient for longwall mining.
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Q284
Open questionThe sudden release of elastic strain energy stores in pillars which results violent burst of coal pillars called
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Q285
Open questionWidth of workings from goaf line of face . . . . . . . .
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Q286
Open questionThe purpose of treatment of holes with chemicals silicate of soda and alluminium sulphate is to reduce
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Q287
Open questionPressure bumps occur
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Q288
Open questionFor design of pillars used is
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Q289
Open questionThe hydraulic profile H : L ratio generally for reasonable good stowing rate is
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Q290
Open questionDerrick made of
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Q291
Open questionKnife edge method of mining is
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Q292
Open questionDucting pipes are made of
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Q293
Open questionThe width of the split gallery should not exceed the width of . . . . . . . . gallery.
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Q294
Open questionFor ordinary compact and moderately wet strata the perma lining constructed with
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Q295
Open questionMechanical stowing only applicable in
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Q296
Open questionThe gate roads extend slightly beyond the face the extended portion of gate.
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Q297
Open questionPurpose of lead sheeting, for parking
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Q298
Open questionWhen the parting between the seams thicker than . . . . . . . . meters it is not necessary to insist on simultaneous pillar extraction.
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Q299
Open questionThe finished diameter of shaft varies from
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Q300
Open questionThe maximum span of L/W face shall not be allowed to exceed.
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