Related Questions

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 of the above
The process, which causes the air to enter the impeller blades of a centrifugal compressor at ________ velocity (without effecting the mass of air to flow and velocity of flow) is known as prewhirl.
A Reduced
B Increased
C Zero
D None of these
At a constant speed of the centrifugal pump . it __________ the impeller diameter.
A Capacity varies directly with
B Head varies as the square of
C Horsepower varies as the cube of
D All of the above
In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.
A Manometric
B Mechanical
C Volumetric
D Overall
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
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 of the above
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)
A 0.5 D
B D
C 1.5 D
D 2 D
Power required to drive a centrifugal pump is directly proportional to _________ of its impeller.
A Diameter
B Square of diameter
C Cube of diameter
D Fourth power of diameter
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°
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

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