Exercise: Fluid Flow

Questions for: Fluid Flow

Reynolds number for turbulent flow over a plate should be more than
A:
5 x 10-5
B:
106
C:
5 x 105
D:
500
Answer: B
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Pluronic F68 protects mammalian cells from damage stems as it is a/an
A:
surface active agent which stabilizes foams
B:
surface active agent which destabilizes foams
C:
excellent source of vitamins
D:
coagulant
Answer: A
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The Komologorov eddy size
A:
is constant at all stirrer speeds
B:
increases with stirrer speed
C:
decreases with stirrer speed
D:
becomes zero when the stirrer speed is very low
Answer: C
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Which of the following is correct?
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.
Answer: C
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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: A
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