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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The working of which of the following hydraulic units is based on Pascal's law?

Air lift pump
Hydraulic coupling
Jet pump
Hydraulic press

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Hydraulics and Fluid Mechanics in ME
For starting an axial flow pump, its delivery valve should be

Open
Closed
Could be either open or closed
Depends on starting condition and flow desired

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Hydraulics and Fluid Mechanics in ME
The dynamic viscosity of gases __________ with rise in temperature.

Increases
Decreases
None of these
Remain unaffected

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Hydraulics and Fluid Mechanics in ME
According to equation of continuity,

a1v1 = a2v2
w1a1 = w2a2
w1v1 = w2v2
a1/v1 = a2/v2

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Hydraulics and Fluid Mechanics in ME
The units of dynamic or absolute viscosity are

metres² per sec
newton-sec per meter
kg sec/meter
newton-sec² per meter

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Hydraulics and Fluid Mechanics in ME
The center of gravity of the volume of the liquid displaced by an immersed body is called

center of pressure
center of buoyancy
center of gravity
metacentre

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