Chemical Engineering - Fluid Mechanics

16. 

A fluid element has a velocity V = -y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2, 1) is

A. rotational and incompressible
B. rotational and compressible
C. irrotational and compressible
D. irrotational and incompressible

Answer: Option B

Explanation:

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17. 

Check in a centrifugal pump is

A. provided in the discharge line.
B. generally a globe valve.
C. provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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18. 

Drag force acting on a body does not depend upon the

A. density of the fluid.
B. density of the body.
C. velocity of the body.
D. projected area of the body.

Answer: Option B

Explanation:

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19. 

Centrifugal pump is normally classified on the basis of the

A. rpm.
B. type of casing.
C. impeller blade angle.
D. number of blades in impeller.

Answer: Option B

Explanation:

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20. 

Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?

A. At the centre
B. At d/4 from the wall
C. At the wall
D. At d/8 from the wall

Answer: Option C

Explanation:

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