When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?

Related Mcqs:

1. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?

   A. A, C, D
   B. B, D, E
   C. A, B, E
   D. A, D, E

2. A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is _____________ litres?

   A. 600
   B. 660
   C. 1.1
   D. 60

3. 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

4. A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is _____________ hp?

   A. 1
   B. 10/55
   C. 5.5
   D. 1/55

5. When the momentum of one fluid is used for moving another fluid, such a device is called a/an______________?

   A. Jet pump
   B. Blower
   C. Acid egg
   D. None of these

6. The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the_________________?

   A. Discharge
   B. Suction
   C. Suction minus vapor pressure of the liquid at suction temperature
   D. Discharge minus vapor pressure of the liquid at the discharge temperature

7. The pressure drop per unit length of pipe incurred by a fluid ‘X’ flowing through pipe is Δp. If another fluid ‘Y’ having both the specific gravity & density just double of that of fluid ‘X’, flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be__________________?

   A. Δp
   B. 2Δp
   C. Δp2
   D. Δp/2

8. In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?

   A. Rotational
   B. Unsteady
   C. Turbulent
   D. Non-uniform

9. Slurries can be most conveniently pumped by a _______________ pump?

   A. Screw
   B. Reciprocating
   C. Gear
   D. Centrifugal

10. Medium viscosity lubricating oil can be most ideally pumped by a ______________ pump?

    A. Vane
    B. Piston
    C. Centrifugal
    D. Plunger