Q161
Open questionWhat should be the speed of air current when the wet bulb temperature exceeds 30.5°C?
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Mining Engineering · all questionsIntroduction to Mining Engineering
Introduction to Mining Engineering
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Q162
Open questionA sample of 144 items gives a mean value of 45, with a standard deviation of 3. Calculate symmetric confidence limits within which the true population lies with 95% confidence?
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Q163
Open questionOne of the important safety feature of cap lamp is
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Q164
Open questionThe term 'Lay' in wire rope is used to denote
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Q165
Open questionQuick production can be achieved from
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Q166
Open questionThe excess pore pressure in backfill material in a cut and fill stope leads to
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Q167
Open questionIn connection with man winding, the approximate floor area per person in a cage shall be
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Q168
Open questionPocket and wing technique of pillar extraction is relevant to
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Q169
Open questionWho out of the following is not an official but a competent person?
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Q170
Open questionIn-situ ore of 1.5% Cu got diluted with waste rock of value 0.2% Cu. If the resultant extracted ore has 1.2% Cu. What is the percentage of dilution?
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Q171
Open questionThick, regular and flat seam is highly essential in
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Q172
Open questionThe practice of regulating the withdrawal of ore in the sub-level cross-cuts so as to optimize the economics of the draw is known as
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Q173
Open questionWhich type of drilling pattern is followed in Blasting Gallery Method?
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Q174
Open questionThe common rate of sand stowing in u/g coal mine is A tons of sand per hour. A is given by
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Q175
Open questionA vertical method similar to stope and pillar mining in the supported class is known as
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Q176
Open questionAs per the Indian Electricity Rules 1956. the maximum permissible length of a flexible cable used with any portable or transportable apparatus in mine is
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Q177
Open questionCommercial coal reserve is
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Q178
Open questionWhich type of ventilation is preferred for hot and deep mines?
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Q179
Open questionIn block caving operation the draw points are placed at 20 m centre to centre, with the pillar width 3.5 m as shown in figure below. The muck is assumed to have zero cohesion and 35 friction angle. The height of draw cone (h) in m is
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Q180
Open questionWhat should be the water requirement in hydraulic mining method, if the dip of the seam is more than 45°?
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