Subtopic: Concentration and drying of liquid foods – evaporators, tray, drum and spray dryers
Question Statement:
Match the following items between Column-I and Column-II with the most appropriate combinations:
| Column-I | Column-II |
|---|---|
| 1) Microwave dryer | P) Cyclone separation |
| 2) Spray dryer | Q) Sublimation of water |
| 3) Freeze dryer | R) Dielectric drying |
| 4) Drum dryer | S) Drying of fruit pulp |
Options:
(A) 1-Q, 2-S, 3-R, 4-P
(B) 1-R, 2-P, 3-Q, 4-S
(C) 1-R, 2-S, 3-Q, 4-P
(D) 1-Q, 2-S, 3-P, 4-R
Official Answer Key:
B
Step-by-Step Solution & Explanation
Microwave drying works by dielectric heating of the moist material → (1–R). Spray drying atomises liquid feed into a hot air stream and typically uses a cyclone separator to collect the dried powder from the exhaust air → (2–P). Freeze drying removes moisture by sublimation of ice under vacuum → (3–Q). Drum drying (a thin film spread on a heated rotating drum) is a classic method for drying fruit pulp (e.g. tomato/mango pulp into flakes) → (4–S). This combination – 1-R, 2-P, 3-Q, 4-S – matches option (B) exactly.
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