Discussion
Assertion (A): Screw conveyors are avoided on long runs of fragile product.
Reason (R): The material is dragged against the trough, which costs both power and breakage.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A screw does not carry the material; it pushes it along a stationary trough, so every particle is dragged against steel for the whole length of the run. Both the friction power and the attrition therefore grow with length, which is why screws suit short transfers and belts suit long ones.
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