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Fluid Mechanics - Section 1 (3)

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Fluid Mechanics - Section 1

There are many problems and MCQs available on Fluid mechanics which
you can solve easily to test your aptitude in fluid mechanic field.

17. 

Dimension of surface tension is(where, F = force, L = length)

A. FL-1
B. F-1 . L
C. F.L-2
D. F-2 . L

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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18. 

The maximum delivery pressure of compressors can be upto __________ atmospheres.

A. 10
B. 100
C. 250
D. 1000

Answer: Option D

Explanation:

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19. 

For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

A. Vs/Dp2
B. Vs2/Dp2
C. Vs2/Dp3
D. Vs/Dp3

Answer: Option A

Explanation:

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20. 

The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s).

A. 24000
B. 24
C. 0.24
D. 0.44

Answer: Option D

Explanation:

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21. 

The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

A. 0.5
B. 1
C. 1.5
D. 2

Answer: Option D

Explanation:

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22. 

In fluid flow, cavitation is caused, if the

A. fluid velocity decreases to zero.
B. total energy decreases.
C. both (a) and (b).
D. flow pressure approaches its vapor pressure at the prevailing temperature.

Answer: Option D

Explanation:

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23. 

The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.

A. Bingham
B. Newtonion
C. perfect
D. none of these

Answer: Option B

Explanation:

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24. 

The pitot static tube does not measure the __________ pressure.

A. static
B. total
C. difference in static & dynamic
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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