Why direct heating by hot air cannot be done in some cases?

Introduction to drying

Quiz
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Other
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University
•
Hard
Dhritiman Debnath
Used 10+ times
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The material can degrade
High temperature not required
Low temperature not required
Conduction gives best results
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When are drum dryers used?
When the material is too thick for spray dryer and too thin for rotary dryer
When the material is too thick for rotary dryer and too thin for spray dryer
When the material is not biodegradable
When large crystal size is to be obtained
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is heating achieved in drum dryers?
By heating the drums
By conduction
By passing steam through hollow screws
By passing steam through the conveyer belt
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the drum dryer called if it is open to the atmosphere?
Open dryer
Box dryer
Trough dryer
Trench dryer
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which materials are not used in drying in a freeze dryer?
Seafood
Fruits
Pharmaceuticals
Dyes
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How the liquid does gets separated in freeze dryer?
Evaporation
Freezing and crystallization
Distillation
Boiling
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Heat sensitive or easily oxidizable materials are dried by:
Flash dryer
Drum dryer
Fluidized bed dryer
Rotary dryer
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