Fluidization Engineering Multiple Choice Questions & Answers (MCQs) on “Drying and Sizing”.
1. Multistage fluidized drier (below fig), was developed based on what purpose?
a) To prevent bypassing of solids
b) To allow bypassing of solids
c) Widen the residence time distribution
d) None of the mentioned
Answer: a
Clarification: It is main reason for decreasing efficiency in single stage drier.
2. What if the temperature is further increased more than 74 degrees mentioned in below fig?
a) Better drying will take place
b) Might damage the solids, or will reach boiling point of solids
c) Will take time for drying
d) None of the mentioned
Answer: b
Clarification: It depends on the material we use, since the temperature is already mentioned it would have been tested before applying it.
3. What kind of driers are used for drying limestone, dolomite,coal, plastics?
a) Fluosolids dryers
b) Multi-stage dryers
c) Two-staged fluidized dryers
d) None of the mentioned
Answer: a
Clarification: Because it shows typical operating capabilities.
4. In two-stage dryer equipment, what is the temperature of the inlet gases on each stage from bottom?
a) 32 and 200 degrees
b) 200 and 32 degrees
c) 16 and 100 degrees
d) 100 and 16 degrees
Answer: a
Clarification: Because it is decided from laboratory testing.
5. What is the maximum water content of the outlet limestone in fluosolids driers fluidized by combustion gas?
a) Zero
b) 0.1%
c) 1%
d) 1.5%
Answer: a
Clarification: Based on the tabular content provided by Fluosolids driers.
6. What is the maximum water content of the outlet blast furnace slag in fluosolids driers fluidized by combustion gas?
a) 0.1-0.4%
b) 0.4-0.8%
c) 0.8-1.2%
d) 1.2-1.6%
Answer: a
Clarification: Based on the tabular content provided by Fluosolids driers.
7. What is the temperature of bed in fluosolids driers fluidized by combustion gas for limestone?
a) 94-107 degrees
b) 150-200 degrees
c) 60-65 degrees
d) None of the mentioned
Answer: a
Clarification: Based on the tabular content provided by Fluosolids driers.
8. What is the temperature of bed in fluosolids driers fluidized by combustion gas for blast furnace slag?
a) 94-105 degrees
b) 150-200 degrees
c) 60-65 degrees
d) None of the mentioned
Answer: a
Clarification: Based on the tabular content provided by Fluosolids driers.
9. What is the temperature of bed in fluosolids driers fluidized by combustion gas for coal?
a) 94-105 degrees
b) 150-200 degrees
c) 60-65 degrees
d) None of the mentioned
Answer: c
Clarification: Based on the tabular content provided by Fluosolids driers.
10. What is the maximum water content of coal in fluosolids driers fluidized by combustion gas?
a) 0.1-0.2%
b) Zero
c) 1-2%
d) None of the mentioned
Answer: a
Clarification: Based on the tabular content provided by Fluosolids driers.