Question

Which one is NOT a continuous flow dryer for food grains?

• A. LSU dryer
• B. Rotary dryer
• C. Baffle dryer
• D. Deep bed dryer

Hint:

If material moves continuously → Continuous dryer. If material stays fixed → Batch dryer.

Answer 1

The Correct Option is D

Concept: Dryers used in food grain processing can be broadly classified into two categories:
• Continuous flow dryers
• Batch (non-continuous) dryers Continuous dryers allow material to move continuously through the drying chamber, whereas batch dryers process a fixed quantity at a time.

Step 1: Understanding continuous flow dryers.
In continuous flow dryers:
• Grain enters from one end and exits from another
• Drying occurs while the material is in motion
• Suitable for large-scale industrial operations Examples include:
• LSU dryer
• Rotary dryer
• Baffle dryer

Step 2: Understanding deep bed dryer.
A deep bed dryer:
• Holds a large quantity of grain in a fixed bed
• Air is passed through the stationary grain mass
• Grain does not move continuously during drying Thus, it operates as a batch-type dryer.

Step 3: Evaluating each option.
• LSU dryer — A well-known continuous flow grain dryer.
• Rotary dryer — Material moves continuously in a rotating drum.
• Baffle dryer — Designed for continuous movement of material.
• Deep bed dryer — Operates in batch mode, not continuous.

Step 4: Final reasoning.
Since the question asks for the dryer which is NOT continuous, the deep bed dryer clearly fits this condition. Final Conclusion:
Deep bed dryer is not a continuous flow dryer; it is a batch-type dryer. Hence, the correct answer is option (4).