In a centrifugal pump casing, the flow of water leaving the impeller, is___________________? - PakMcqs

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1. In a centrifugal pump casing, the flow of water leaving the_______________?

   A. radial B. radial C. centrifugal D. rectilinear E. vortex...

2. Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?

   A. rotational flow B. radial C. forced spiral vortex flow D. forced cylindrical vortex flow E. spiral vortex flow...

3. The optimum value of vane exit angle for a centrifugal pump impeller is_________________?

   A. 10-15° B. 20-25° C. 30-40° D. 50-60° E. 80-90°....

4. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?

   A. same quantity of liquid B. 0.75 Q C. Q/0.75 D. 1.5 Q E. none of the above...

5. A turbine pump is basically a centrifugal pump equipped additionally with_________________?

   A. adjustable blades B. backward curved blades C. vaned diffusion casing D. inlet guide blades E. totally submerged operation facility...

6. In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?

   A. designing new impeller B. trimming the impeller size to the required size by machining C. not possible D. some other alterations in the impeller E. none of the above...

7. Centrifugal pump is started with its delivery valve __________________?

   A. kept fully closed B. kept fully open C. irrespective of any position D. kept 50% open E. none of the above...

8. Head developed by a centrifugal pump depends on___________________?

   A. impeller diameter B. speed C. fluid density D. type of casing E. A. and B. above...

9. The efficiency of a centrifugal pump is maximum when its blades are__________________?

   A. straight B. bent forward C. bent backward D. bent forward first and then backward E. bent backward first and then forward...

10. In a centrifugal pump, the liquid enters the pump__________________?

    A. at the top B. at the bottom C. at the center D. from sides E. none of the above...