Question

Louisiana State University dryer is suitable for drying of
(A) Pulses
(B) Marine products
(C) Paddy
(D) Fruits and vegetables
Choose the correct answer from the options given below:

• A. (A), (B) and (C) only.
• B. (A), (B), (C) and (D).
• C. (C) only.
• D. (C) and (D) only.

Hint:

Associate the LSU dryer directly with continuous-flow, baffle-type grain dryers engineered specifically to maintain grain quality in delicate crops like paddy, preventing head rice yield losses.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The Louisiana State University (LSU) dryer is a classic type of continuous-flow, mixing-type grain dryer widely used in post-harvest processing of agricultural grains.

Step 2: Detailed Explanation:
The LSU dryer operates on a specialized baffle system:

It consists of a vertical drying chamber containing rows of V-shaped, horizontal metal channels (baffles or ports).

Alternating rows of these ports are inlets for hot air and outlets for moisture-laden exhaust air.

As wet grain is fed from the top, it descends under gravity in a zigzag path around these baffles, which ensures thorough mixing of the grain mass.

This continuous mixing action prevents localized overheating and ensures uniform moisture removal across the entire bulk of the grain.

This uniform, gentle heating is particularly critical forpaddy (rice) because uneven drying or excessive heat can cause thermal stresses, resulting in internal cracks (fissures) that lead to grain breakage during subsequent milling.

The LSU dryer is specifically engineered and globally adopted for drying high-moisture cereal grains like paddy, corn, and wheat, rather than bulky products like fruits, vegetables, or marine products, which require completely different drying mechanisms (like tray or tunnel dryers).
Thus, the LSU dryer is primarily suitable for paddy.

Step 3: Final Answer:
The correct option is (C), representing (C) only.