In which case will the permissible incline in belt conveyor be maximum?
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A.
Dry silica sand
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B.
Foundry sand
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C.
Wet clay
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D.
Coal run of mine
Correct Answer:
B. Foundry sand
Explanation:
The maximum permissible incline for a belt conveyor is determined by the material's angle of repose and its flowability. Materials with a higher angle of repose and lower flowability (sluggishness) can be transported at steeper angles without sliding backward. Among the options provided, foundry sand is classified as a sluggish material with a high angle of repose (often over 40 degrees) due to its interlocking particles and moisture content, allowing for the steepest possible incline compared to free-flowing dry silica sand, slippery wet clay, or irregular coal.
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