| 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.
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| a. | 10 m |
| b. | 11 m |
| c. | 12 m |
| d. | 20 m |
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Answer: (b).11 m
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| 12. | Pick out the Kozney-Karman equation (valid for low Nʀₑ) for fluid flow through a packed bed of solids.
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| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (c).C
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| 13. | Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively
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| 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.
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| 14. | Specific speed for a centrifugal pump is
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| a. | A |
| b. | B |
| c. | C |
| d. | D |
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Answer: (a).A
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| 15. | For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be
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| 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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