Question

Elevators are conveying machines for handling of bulk materials on verticle or steep slope of ______.

• A. 0-10 degree to the horizontal
• B. 30-40 degree to the horizontal
• C. 60-80 degree to the horizontal
• D. In horizontal direction only

Hint:

Conveyors handle horizontal or shallow angles (up to \(45^{\circ}\)), whereas elevators handle steep vertical or near-vertical lifts (\(60-90^{\circ}\)).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Conveying machinery is used to transport bulk raw agricultural materials (grains, seeds) within a food processing plant. Elevators are specialized for vertical or high-incline transport.

Step 2: Detailed Explanation:
- Flat belt and screw conveyors are generally designed for horizontal or gentle incline transport (typically below \(30-40^{\circ}\)).
- For vertical lift or very steep inclinations, elevators (such as bucket elevators) are employed.
- Elevators operate efficiently at very steep angles, typically ranging from \(60^{\circ}\text{ to }80^{\circ}\) (and up to \(90^{\circ}\)) relative to the horizontal, lifting bulk grains or materials into silos or processing bins.

Step 3: Final Answer:
Elevators are conveying machines used for handling materials on steep slopes of 60 to 80 degrees to the horizontal.