E-PolyLearning

11. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.
a. 10 m
b. 11 m
c. 12 m
d. 20 m
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Answer: (b).11 m

12. Pick out the Kozney-Karman equation (valid for low Nʀₑ) for fluid flow through a packed bed of solids.
a. A
b. B
c. C
d. D
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Answer: (c).C

13. Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively
a. efficiency, head and B.H.P.
b. head, efficiency and B.H.P.
c. B.H.P., efficiency and head
d. efficiency, B.H.P. and head
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Answer: (b).head, efficiency and B.H.P.

14. Specific speed for a centrifugal pump is
a. A
b. B
c. C
d. D
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Answer: (a).A

15. For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be
a. V₁ < V₂ < V₃
b. V₂ > V₁ and V₂ > V₃
c. V₁ > V₂ > V₃
d. none of these.
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Answer: (b).V₂ > V₁ and V₂ > V₃

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