Correct option is B
Foundry sand allows for the maximum permissible incline in a belt conveyor because it has better flowability and cohesion compared to materials like wet clay, which is sticky and can easily cause blockages. Foundry sand is typically more granular and less prone to slipping, enabling a steeper conveyor incline.
Dry silica sand: Slippery, resulting in a lower permissible incline.
Foundry sand: Correct, as it has better stability and allows for a steeper incline.
Wet clay: Very cohesive and sticky, resulting in a lower permissible incline.
Coal run of mine: Although rough, its characteristics still limit the incline compared to foundry sand.
Therefore, the correct answer is (b) Foundry sand.
