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Fluid Flow Online Exam Quiz

Important questions about Fluid Flow. Fluid Flow MCQ questions with answers. Fluid Flow exam questions and answers for students and interviews.

1. A pseudoplastic fluid is one in which the viscosity

Options

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

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

Options

A : single celled bacteria

B : filamentous fungi that form pellets

C : filamentous fungi that grow as long poorly branched chains

D : yeast

3. The viscosity of a fluid changes with either stirrer speed or mixing time. But when mixing ceases, the viscosity returns to its original state. This fluid is best described as

Options

A : newtonian

B : rheopectic

C : viscoelastic

D : thixotropic

4. A liquid is flowing at 11,400 l.h -1 along a pipeline having a diameter of 4 cm. If the liquid has a density of 1 g.ml -1 and viscosity of 0.001kg.m -1 .s -1 , then the liquid would be in the

Options

A : laminar phase

B : transient phase

C : turbulent phase

D : any of the phase

5. Bubble free aeration systems requires

Options

A : silicone tubing or gas permeable membranes to facilitate gas transfer

B : carbon dioxide instead of air to supply oxygen

C : silicone tubing or gas permeable membranes to remove carbon dioxide by oxygen in the form of hydrogen peroxide

D : filled headspace of the reactor with carbon dioxide

6. If the viscosity of a fluid decreases with the length of time that it is being mixed, then this fluid is

Options

A : newtonian

B : rheopectic

C : viscoelastic

D : thixotropic

7. A viscoelastic fluid is one in which the viscosity

Options

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

8. Which of the following is correct?

Options

A : The viscosity of liquids and gases decrease with increasing temperature

B : The viscosity of liquids and gases increase with increasing temperature

C : the viscosity of gases increases with increasing temperature, but decreases in liquids

D : the viscosity of gases decreases with increasing temperature, but decreases in liquids.

9. Pluronic F68 protects mammalian cells from damage stems as it is a/an

Options

A : surface active agent which stabilizes foams

B : surface active agent which destabilizes foams

C : excellent source of vitamins

D : coagulant

10. Mixing in stirred tank reactors can

Options

A : be described as either laminar, transient or turbulent

B : achieve turbulent conditions by increasing the stirrer speed

C : induce laminar flow conditions by the addition of baffles

D : all of the above

1. If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid is

Options

A : newtonian

B : pseudoplastic

C : dilatant

D : thixotropic

2. Pluronic F68 is added to cell culture media as

Options

A : a nutrient

B : a shear protectorant

C : to increase oxygen transfer rates

D : all of these

3. Which of the following affect the Kolmogorov eddy size?

Options

A : Stirrer speed

B : Physical properties of the liquid

C : Size and type of impeller

D : All of these

4. The best described action of Pluronic F68 (non-ionic detergent) in a cell culture medium is that, it

Options

A : acts on the surface properties of the cells and the culture medium

B : provides nutrients for the cells

C : acts as a flocculant

D : acts as a coagulant

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

Options

A : newtonian fluid

B : pseudoplastic, thixotropic fluid

C : dilatant, rheopectic fluid

D : dilatant pseudoplastic fluid

6. A rheopectic fluid is one in which the viscosity

Options

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

7. The viscous nature of a non-Newtonian fluid

Options

A : remains constant with time and power input

B : changes with the level of power input and/or the length of time during which the fluid is mixed

C : is similar to that of a perfect gas

D : is similar to that of water

8. Reynolds number for laminar flow over a plate should be less than

Options

A : 500 mm

B : 5 x 10 -5

C : 5 x 10 5

D : 5 m

9. Newtonian fluid is one in which the viscosity

Options

A : remains constant with time and power input

B : increases with the level of power input

C : decreases with the level of power input

D : drastically increases with the level of power input

10. A Brookfield viscometer cannot determine the shear stress because

Options

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

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