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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Specific weight of water in S.I. units is equal to

10000 N/m3
1000 N/m3
9.81 xlO6 N/m3
9.81 xlO3 N/m3

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Hydraulics and Fluid Mechanics in ME
Casting of a centrifugal pump is designed so as to minimize

Static head
Cavitations
Loss of kinetic energy
Friction loss

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Hydraulics and Fluid Mechanics in ME
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R3/2/15Cd × a √(2g)
14π R5/2/15Cd × a √(2g)
14π R1/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)

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Hydraulics and Fluid Mechanics in ME
Motion of a liquid in a volute casing of a centrifugal pump is an example of

Forced spiral vortex flow
Spiral vortex flow
Radial
Rotational flow

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Hydraulics and Fluid Mechanics in ME
If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

None of these
Geometric similarity
Kinematic similarity
Dynamic similarity

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Hydraulics and Fluid Mechanics in ME
When the Mach number is between ___ the flow is called super-sonic flow.

4 and 6
1 and 6
2.5 and 4
1 and 2.5

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