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

Correct Answer: C. dilatant

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

Correct Answer: C. increases with increasing stirrer speed

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

Correct Answer: C. increases with mixing time

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

Correct Answer: C. dilatant, rheopectic fluid

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

Correct Answer: C. filamentous fungi that grow as long poorly branched chains

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