The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________?

Related Mcqs:

1. 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

2. 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

3. 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.

4. When the water is warm, the height to which it can be lifted by a pump_________________?

   A. Decreases due to reduced viscosity
   B. Decreases due to reduced vapour pressure
   C. Increases due to increased vapour pressure
   D. Decreases due to increased frictional resistance

5. Boiler feed water pump is usually a ______________ pump?

   A. Reciprocating
   B. Gear
   C. Multistage centrifugal
   D. Diaphragm

6. 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

7. 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

8. A mono pump is a __________ pump ?

   A. Centrifugal
   B. Piston
   C. Positive acting rotary
   D. A group of vacuum

9. Specific speed of a centrifugal pump relates it with another pump having the___________________?

   A. Dynamic similarity
   B. Same efficiency
   C. Same speed
   D. Geometrical similarity

10. High specific speed of a pump implies that, it is a/an _____________ pump?

    A. Centrifugal
    B. Mixed flow
    C. Axial flow
    D. None of these