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
Trimming the impeller size to the required size by machining
Designing new impeller
Not possible

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Hydraulics and Fluid Mechanics in ME
A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, theni) the ball will move to the frontii) the bubble will move to the frontiii) the ball will move to the reariv) the bubble will move to the rear Find out which of the above statements are correct ?

(i) and (iv)
(i) and (ii)
(ii) and (iii)
(iii) and (iv)

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Hydraulics and Fluid Mechanics in ME
The purpose of a surge tank is

To control the pressure variations due to rapid changes in the pipe line flow
To regulate flow of water to turbines by providing necessary retarding head of water
To eliminate water hammer possibilities
All of these

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