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
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
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
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 of the above
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
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
For centrifugal pump impeller, the maximum value of the vane exit angle is
A 10° to 15°
B 15° to 20°
C 20° to 25°
D 25° to 30°
The impeller of a centrifugal pump may have
A Volute casing
B Volute casing with guide blades
C Vortex casing
D Any one of these

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