Question:
The angle between the base and the slope of the cone formed on a free vertical fall of the granular material to a horizontal plane is called
The angle between the base and the slope of the cone formed on a free vertical fall of the granular material to a horizontal plane is called
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Angle of repose ($\theta < 30^\circ$) indicates excellent bulk flowability, while $\theta > 45^\circ$ indicates cohesive, poorly flowing powder.
Updated On: Sep 15, 2026
- Angle of internal friction
- Angle of external friction
- Angle of repose
- Angle of plane of rupture
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Bulk granular materials exhibit characteristic inter-particle friction angles when poured freely under gravity.
Step 2: Detailed Explanation:
When bulk grains or powders are discharged freely onto a horizontal surface, they form a conical heap.
The maximum angle formed between the horizontal base plane and the inclined conical slope without slumping is termed the angle of repose ($\theta$).
It is a key parameter in designing storage silos, hoppers, and grain chutes.
Step 3: Final Answer:
Hence, this angle is called the angle of repose.
Bulk granular materials exhibit characteristic inter-particle friction angles when poured freely under gravity.
Step 2: Detailed Explanation:
When bulk grains or powders are discharged freely onto a horizontal surface, they form a conical heap.
The maximum angle formed between the horizontal base plane and the inclined conical slope without slumping is termed the angle of repose ($\theta$).
It is a key parameter in designing storage silos, hoppers, and grain chutes.
Step 3: Final Answer:
Hence, this angle is called the angle of repose.
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