Related Questions

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
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 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
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as
A D2
B D5
C D
D D9
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
A Delivers unit discharge under unit head
B Delivers unit discharge under unit speed
C Develops unit power under unit head
D Develops unit power under unit speed
The pump impeller and the turbine runner in a hydraulic torque converter
A Have the same diameter
B Have different diameters
C Are directly coupled
D None of these
Turbine impeller
A Produces only radial current
B Produces only tangential current
C Is effective over wide range of viscosities
D Does not produce tangential current
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
With a constant diameter impeller of a centrifugal pump
A Its capacity varies directly as the square of speed
B Head varies as the square of speed
C Horsepower input varies as the square of speed
D Head varies as the speed
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

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