Biochemical Engineering

Question: If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is
[A].

newtonian

[B].

rheopectic

[C].

viscoelastic

[D].

thixotropic

Answer: Option D

Explanation:

No answer description available for this question.

Question: If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid is
[A].

newtonian

[B].

pseudoplastic

[C].

dilatant

[D].

thixotropic

Answer: Option B

Explanation:

No answer description available for this question.

Question: The SI unit for viscosity is
[A].

kg.m-1.s-1

[B].

kg.m-2.s-2

[C].

kg.m-3.s-1

[D].

kg.m-1.s-2

Answer: Option A

Explanation:

No answer description available for this question.

Question: A Brookfield viscometer cannot determine the shear stress because
[A].

the shear stress is not defined

[B].

a computer is required

[C].

the impeller type is given only by numbers

[D].

all of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: A Brookfield viscometer measures viscosity by determining
[A].

the shear stress

[B].

the shear rate

[C].

the shear stress and shear rate

[D].

the torque required to move an impeller at a set speed

Answer: Option D

Explanation:

No answer description available for this question.

Question: A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as
[A].

newtonian fluid

[B].

pseudoplastic, thixotropic fluid

[C].

dilatant, rheopectic fluid

[D].

dilatant, pseudoplastic fluid

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: A Newtonian 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 A

Explanation:

No answer description available for this question.

Question: A viscoelastic 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 B

Explanation:

No answer description available for this question.

Question: A pseudoplastic 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 D

Explanation:

No answer description available for this question.