This set of Heat Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Fouling Factor”.
1. Which one is having the highest value of fouling factor?
a) Sea water
b) Distilled water
c) Liquid gasoline
d) Clean river
View Answer
Explanation: Fouling factor for liquid gasoline is 0.0008 while that of clean river, sea water and distilled water are 0.0002, 0.0001 and 0.0001 respectively. Fouling factor = 1/hS.
2. What is the value of fouling factor for sea water?
a) 0.0001-0.0002 m2 K/W
b) 0.0002-0.0003 m2 K/W
c) 0.0003-0.0004 m2 K/W
d) 0.0004-0.0005 m2 K/W
View Answer
Explanation: There are strong hydrogen bonding between its molecules.
3. What is the value of fouling factor for clean river?
a) 0.0014-0.0018 m2 K/W
b) 0.0010-0.0014 m2 K/W
c) 0.0006-0.0010 m2 K/W
d) 0.0002-0.0006 m2 K/W
View Answer
Explanation: It has low electrical conductivity but this increases with the dissolution of small amount of ionic materials.
4. Which one is having the lowest value of fouling factor?
a) Lake river
b) Distilled water
c) Transformers
d) Lubricating oil
View Answer
Explanation: Fouling factor for distilled water is 0.0001 while that of Lake River, transformer and lubricating oil are 0.0002, 0.0002 and 0.0002 respectively.
5. What is the value of fouling factor for treated boiler feed water?
a) 0.0001-0.0002 m2 K/W
b) 0.0002-0.0003 m2 K/W
c) 0.0003-0.0004 m2 K/W
d) 0.0004-0.0005 m2 K/W
View Answer
Explanation: It is a good polar solvent and is referred to as the universal solvent. Fouling factor = 1/hS.
6. Which one is having the highest value of fouling factor?
a) Industrial liquids
b) Fuel oil
c) Turbine exhaust
d) Engine exhaust
View Answer
Explanation: Fouling factor for engine exhaust is 0.002 while that of industrial liquids, fuel oil and turbine exhaust are 0.0002, 0.0010 and 0.0002 respectively.
7. What is the value of fouling factor for fuel oil?
a) 0.0009 m2 K/W
b) 0.0010 m2 K/W
c) 0.0011 m2 K/W
d) 0.0012 m2 K/W
View Answer
Explanation: It is a neutral, non-polar chemical substance that is viscous liquid at ambient temperature.
8. Which one is having the lowest value of fouling factor?
a) Fuel gases
b) Oil bearing system
c) Non-oil bearing system
d) Engine exhaust
View Answer
Explanation: Fouling factor for non-oil bearing system is 0.0001 while that of fuel gases, oil bearing system and engine exhaust are 0.0010, 0.0002 and 0.002 respectively.
9. What is the value of fouling factor for oil bearing steam?
a) 0.0002 m2 K/W
b) 0.0003 m2 K/W
c) 0.0004 m2 K/W
d) 0.0005 m2 K/W
View Answer
Explanation: Fouling factor = 1/hS.
10. Which one is having the highest value of fouling factor?
a) Clean water
b) Sea water
c) Liquid gasoline
d) Distilled water
View Answer
Explanation: Fouling factor for liquid gasoline is 0.0008 while that of clean water, sea water and distilled water are 0.0002, 0.0001 and 0.0001 respectively.
Sanfoundry Global Education & Learning Series – Heat Transfer.
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