Multistage centrifugal pumps are used to obtain___________________?

Related Mcqs:

1. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of____________________?

   A. high initial and maintenance cost
   B. lower discharge
   C. lower speed of operation
   D. necessity of air vessel
   E. all of the above

2. In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?

   A. straight
   B. bent forward
   C. bent backward
   D. radial
   E. given aerofoil section

3. 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

4. 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

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

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

6. 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

7. 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°.

8. 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

9. 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

10. In a centrifugal pump casing, the flow of water leaving the impeller, is___________________?

    A. rectilinear flow
    B. radial flow
    C. free vortex motion
    D. forced vortex
    E. none of the above