Biochemical Engineering - Fluid Flow

Exercise :: Fluid Flow - Section 1

  • Fluid Flow - Section 1
26. 

The viscosity of a fluid increases with increasing stirrer speed. This fluid would be best described as being

A. newtonian
B. pseudoplastic
C. dilatant
D. thixotropic

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

27. 

A dilatant fluid is one in which the viscosity

A. is constant regardless of the stirrer speed or mixing time
B. changes during mixing but returns to its original state after mixing
C. increases with increasing stirrer speed
D. decreases with increasing stirrer speed

Answer: Option C

Explanation:

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28. 

A rheopectic fluid is one in which the viscosity

A. is constant regardless of the stirrer speed or mixing time
B. changes during mixing but returns to its original state after mixing
C. increases with mixing time
D. decreases with mixing time

Answer: Option C

Explanation:

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29. 

A fluid in which the viscosity increases with increasing stirrer speed and mixing time can be called as

A. newtonian fluid
B. pseudoplastic, thixotropic fluid
C. dilatant, rheopectic fluid
D. dilatant pseudoplastic fluid

Answer: Option C

Explanation:

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30. 

The medium will have the highest viscosity (considering that the cells do not secrete gums) with the presence of

A. single celled bacteria
B. filamentous fungi that form pellets
C. filamentous fungi that grow as long poorly branched chains
D. yeast

Answer: Option C

Explanation:

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