1) What is the ratio of maximum velocity to average velocity, when the fluid is passing through two parallel plates and flow is laminar?
a. 3/2
b. 2/3
c. 4/3
d. 3/4
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Answer
Explanation
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ANSWER: 3/4
Explanation:
No explanation is available for this question!
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2) Below diagram shows the velocity distribution of fluid flow through a pipe. Flow is laminar.
What is the ratio of maximum velocity to average velocity?
a. 1
b. 2
c. 4
d. 3.14
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Answer
Explanation
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ANSWER: 2
Explanation:
No explanation is available for this question!
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3) What is temporal mean velocity?
a. The average of velocities at a point over a certain period of time
b. The average of velocities of a single particle over different locations in a fluid flow
c. None of the above
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Answer
Explanation
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ANSWER: The average of velocities at a point over a certain period of time
Explanation:
No explanation is available for this question!
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4) Friction factor for laminar flow is given by
a. (Re /64)
b. (64 / Re)
c. (Re / 16)
d. (16 / Re)
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Answer
Explanation
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ANSWER: (64 / Re)
Explanation:
No explanation is available for this question!
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5) Kinematic eddy viscosity (ε) is the ratio of
a. eddy viscosity (η) to dynamic viscosity (μ)
b. eddy viscosity (η) to kinematic viscosity (ν)
c. kinematic viscosity to eddy viscosity (η)
d. eddy viscosity (η) to mass density (ρ)
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Answer
Explanation
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ANSWER: eddy viscosity (η) to mass density (ρ)
Explanation:
No explanation is available for this question!
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6) Magnitude of eddy viscosity for laminar flow is
a. less than zero
b. zero
c. greater than zero
d. unpredictable
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Answer
Explanation
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ANSWER: zero
Explanation:
No explanation is available for this question!
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7) Shear stress in a turbulent flow is given by the formula
τ = η (du / dy)
Where η (eta) is,
a. eddy viscosity
b. apparent viscosity
c. virtual viscosity
d. all of the above
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Answer
Explanation
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ANSWER: all of the above
Explanation:
No explanation is available for this question!
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8) Coefficient of friction for laminar flow is given as
Where,
Re = Reynold's number
a. (Re / 32)
b. (32 / Re)
c. (Re / 16)
d. (16 / Re)
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Answer
Explanation
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ANSWER: (16 / Re)
Explanation:
No explanation is available for this question!
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9) How should be the viscosity of the flowing fluid for laminar flow?
a. viscosity of the fluid should be as low as possible, for laminar flow
b. viscosity of the fluid should be as high as possible, for laminar flow
c. change in viscosity of the flowing fluid does not affect its flow
d. unpredictable
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Answer
Explanation
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ANSWER: viscosity of the fluid should be as high as possible, for laminar flow
Explanation:
No explanation is available for this question!
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10) The flow of fluid will be laminar when,
a. Reynold's number is less than 2000
b. the density of the fluid is low
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: both a. and b.
Explanation:
No explanation is available for this question!
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