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The average loading performance per loader in manual quarry is nearly of (1.1 m 3 capacity).

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Soluble organisms represented by high "A" waste causes depletion of O 2 in the surface water that results in fish kills and undesirable changes in aquatic life. A is given by A toxic gas flows into a mine working place at the rate of 2.52 m 3 /min. The concentration of the gas in the intake air is 0.25%. The minimum quantity of intake air in m 3 /min required to dilute the gas to its threshold limit value of 1.0% is Multiple fan in series are connected when Specific gravity of magnetite Which of the following is not level.