This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Drying Equipments”.
1. In which industry are tunnel truck dryers mostly used?
a) Pharma industry
b) Textile industry
c) Ceramic industry
d) Chemical industry
View Answer
Explanation: The use in the chemical industry is less common, it is mainly used in the ceramic industry to dry potteries.
2. What is the drying time in the tunnel truck dryer?
a) The time taken by each tunnel
b) The time taken by each truck
c) The sum of all time taken by all tunnels
d) The sum of all time taken by all the trucks
View Answer
Explanation: The drying time is the sum of the time taken by all the trucks.
3. What leads to uneven drying in belt or conveyer dryer?
a) Change in speed of belt
b) High speed of belt
c) Maldistribution of air
d) High moisture retaining solids
View Answer
Explanation: The maldistribution of air causes uneven drying in belt dryer.
4. For what solids is belt dryer used?
a) Coarse
b) Smooth
c) Wet
d) Dry
View Answer
Explanation: Belt dryer is generally suitable for coarse materials. That is materials in form of granules, pellets.
5. Which are the most used dryers in chemical industry?
a) Tunnel dryers
b) Truck dryers
c) Rotary dryers
d) Belt dryers
View Answer
Explanation: Rotary dryers are called as workhorse of chemical industry and are most popularly used.
6. Why is a low flow rate of air maintained in a rotary dryer?
a) To carry forward the crystals
b) To increase the speed of crystallization
c) To evaporate the water
d) To carry away the evaporated water
View Answer
Explanation: A low flow rate of air or an inert gas is maintained to carry away the evaporated water.
7. What is the heat efficiency of a rotary dryer?
a) 10%
b) 20%-30%
c) 40%-50%
d) 20%-80%
View Answer
Explanation: Depending upon the operation temperature the heat efficiency of a rotary dryer is 20-80%.
8. Which dryer is suitable for heat sensitive materials?
a) Jacketed-shelf dryer
b) Agitated pan dryers
c) Conical vacuum dryer
d) Indirect heat continuous dryer
View Answer
Explanation: Jacketed-shelf dryer is suitable for heat sensitive and oxidizable materials.
9. Which dryer is used for drying powders and dyes?
a) Jacketed-shelf dryer
b) Agitated pan dryers
c) Conical vacuum dryer
d) Indirect heat continuous dryer
View Answer
Explanation: Conical vacuum dryer is used to dry powders and dyes and pigments.
10. How does the heat transfer occurs in the indirect-heat continuous dryers?
a) Conduction
b) Convection
c) Radiation
d) Circulation
View Answer
Explanation: In indirect-heat continuous dryers, heat transfer to the wet material occurs by conduction through the wall of the dryer.
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