Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________?

Related Mcqs:

1. What is the maximum theoretical suction lift (metres) of a reciprocating pump ?

   A. 5
   B. 10
   C. 50
   D. 100

2. Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _____________________ ft?

   A. 40
   B. 34
   C. 8
   D. 37

3. 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

4. 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

5. 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.

6. The percentage slip in a reciprocating pump set is given by the % of (where, Q1 = actual discharge Q2 = theoretical discharge) ?

   A. Q1/Q2
   B. Q2/Q1
   C. (Q2 – Q1)/Q1
   D. (Q2 – Q1)/Q2

7. Purpose of air lift pump is to____________________?

   A. Compress air
   B. Lift compressed air
   C. Lift water from a well by using compressed air
   D. Lift air under negative pressure

8. 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.

9. 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

10. Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type?

    A. Axial
    B. Radial
    C. Mixed
    D. None of these