# Heat Transfer MCQ’s – Fouling Factor

1 - Question

Which one is having the highest value of fouling factor?
a) Sea water
b) Distilled water
c) Liquid gasoline
d) Clean river
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 - Question

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
Explanation: There are strong hydrogen bonding between its molecules.

3 - Question

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
Explanation: It has low electrical conductivity but this increases with the dissolution of small amount of ionic materials

4 - Question

Which one is having the lowest value of fouling factor?
a) Lake river
b) Distilled water
c) Transformers
d) Lubricating oil
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 - Question

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
Explanation: It is a good polar solvent and is referred to as the universal solvent. Fouling factor = 1/hS.

6 - Question

Which one is having the highest value of fouling factor?
a) Industrial liquids
b) Fuel oil
c) Turbine exhaust
d) Engine exhaust
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 - Question

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
Explanation: It is a neutral, non-polar chemical substance that is viscous liquid at ambient temperature.

8 - Question

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
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 - Question

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
Explanation: Fouling factor = 1/hS.

10 - Question

Which one is having the highest value of fouling factor?
a) Clean water
b) Sea water
c) Liquid gasoline
d) Distilled water