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Mine safety

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Questions


The characteristic curves of two mine fans installed in series in a fan drift are P = 2000 − 6Q − 0.2Q 2 and P = 3000 − 8Q − 0.2Q 2 where P is pressure in Pa and Q is quantity in m3 /s. If the mine quantity is 70 m3 /s, the mine resistance, in Ns2m-8 , (rounded off to two decimal places) is _________.
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T he immediate roof of a mine is supported by bolts of length 1.5 m, arranged in 1.2 m x 1.2 m grid pattern. If the unit weight of roof rock is 2.25 tonne/m3 and load carrying capacity of each bolt is 7.5 tonne, the factor of safety of the support system is _______________.
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In a typical coal mine area affected by acid mine drainage, which one of the following acids will be dominant? GATE-Geology and Geophysics-Question-2012
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Consider the goals of the safety policy of a company, at once designating also the responsibilities and authority for their achievement :
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Respirable dust in an underground coal mine contains 4.5% free silica. As per the CMR 2017, the maximum allowable respirable dust concentration, in mg/m3 , in the mine air is
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India’s livestock disease monitoring and forecasting system is named as
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In the context of mine planning, match the following:
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Consider the following statements:
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On a photo-scale of 1:40000, a square shaped open cast coal mine of 1 km2 area would have an area of (in cm2) GATE-Geology and Geophysics-Question-2012
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The length of the pile required for the above design load with a factor of safety of 2.0 is (GATE-CIVIL-Engg-2018)
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A solid circular shaft is designed to transmit a torque T with a factor of safety of 2. It is proposed to replace the solid shaft by a hollow shaft of the same material and identical outer radius. If the inner radius is half the outer radius, the factor of safety for the hollow shaft is _____ (round off to 1 decimal place).
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For which of the following sectors do comprehensive safety and health statutes, for regulating Occupational Safety and Health (OSH) at work places, exist at present in India ?
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What is safety and risk?
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Look at the bracketed part of each sentence. Below each sentence are given three possible substitutions for the bracketed part. If one of them (a), (b) or (c) is better than the bracketed part, mark your response against the corresponding options (a) , (b) or (c). If none of the substitutions improves the sentence then mark the option (d) as your response. Many (a young men) wants to join the army.
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Recommendations on road safety.
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Explain road safety equipments.
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For a mining company the unit transportation cost from a mine to a washery, and supply and demand are shown below:
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What is Safety and risk Trade-Off
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Safety matches contain
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Explain safety algorithm in Operating system
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