In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the _____________ efficiency?

Related Mcqs:

1. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases?

   A. NPSH required B. BHP required by the pump C. Head of the liquid pumped D. All A., B. and C....

2. Which is the correct relationship for a centrifugal pump? (Where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) ?

   A. D = 1840 H0.5/N B. D = 1840 N/H0.5 C. H = 1840 D0.5/N D. D = 1840 H/N...

3. In case of a centrifugal pump, the theoretical head developed is dependent on the _____________ the impeller?

   A. Speed of B. Diameter of C. Fluid velocity leaving D. All A., B. and C....

4. Various efficiencies of a centrifugal pump are related as (where, εm = mechanical efficiency εv = volumetric efficiency. εma = manometric efficiency εo = overall efficiency) ?

   A. ηma × ηm × ηv = ηo B. ηm = ηv . ηma C. ηma = ηm × ηv D. ηv = ηm × ηma...

5. Theoretical head developed by a centrifugal pump does not depend upon the _____________ the impeller?

   A. Radius of B. Speed of C. Fluid velocity leaving D. None of these...

6. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?

   A. Develops a lower head B. Capacity is reduced C. Requires more power D. All A., B. and C....

7. The blades of a centrifugal impeller are said to be curved forward, if the ____________ of the motion of impeller blades?

   A. Inlet tip of a blade curves in a direction opposite to that B. Outlet tip of a blade curves in a direction opposite to that C. Inlet tip of a blade is towards the direction D. Outlet tip of a blade is towards the direction...

8. 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. 11.8 m D. 30 m...

9. A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?

   A. Increase B. Decrease C. Remain same D. Data insufficient to predict...

10. At a constant speed of the centrifugal pump, it‟s _____________ the impeller diameter?

    A. Capacity varies directly with B. Head varies as the square of C. Horsepower varies as the cube of D. All A., B. and C....