Hydraulics and Fluid Mechanics in ME
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Some other alterations in the impeller
Not possible
Trimming the impeller size to the required size by machining
Designing new impeller

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Hydraulics and Fluid Mechanics in ME
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is

one-half its value when cylinder was full
zero
cannot be predicted from the given data
one-fourth its value when cylinder was full

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Hydraulics and Fluid Mechanics in ME
The total head of a liquid particle in motion is equal to

Potential head - (pressure head + kinetic head)
Kinetic head - (pressure head + potential head)
Pressure head - (kinetic head + potential head)
Pressure head + kinetic head + potential head

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