Fluid Mechanics
A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now

Data insufficient to predict
Increase
Remain same
Decrease

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Fluid Mechanics
A stream line is

A line connecting the mid points of flow cross-section
Always the path of particle
Fixed in space in steady flow
Drawn normal to the velocity vector at every point

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