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GATE 2021 MN – Question 56

Mining Methods and Machinery · Mining Methods · 2 marks · Numerical answer

A stowing slurry contains 35% sand by volume. Sand specific gravity is 2.6. Find sand concentration by mass in percent, to one decimal.

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Correct answer: 57.00 to 59.80

Explanation

Take 1 m³ of slurry. Sand mass is 0.35×2600=910 kg; water mass is 0.65×1000=650 kg. Sand mass fraction is 910/(910+650)=0.583333. Thus 58.3% by mass, which exceeds the volume percentage because sand is denser than water.

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