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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a centrifugal pump, the regulating valve is provided on the

Impeller
Casing
Delivery pipe
Suction pipe

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Hydraulics and Fluid Mechanics in ME
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

Q = π.b.Vf
Q = π.D.Vf
Q = D.b.Vf
Q = π.D.bf.V

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Hydraulics and Fluid Mechanics in ME
The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is

48.2 r.p.m
248 r.p.m
24.8 r.p.m.
82.4 r.p.m.

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Hydraulics and Fluid Mechanics in ME
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

Medium speed with radial flow at outlet
Slow speed with radial flow at outlet
High speed with radial flow at outlet
High speed with mixed flow at outlet

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Hydraulics and Fluid Mechanics in ME
Hydrometer is used to determine

specific gravity of liquids
relative humidity
specific gravity of gases
specific gravity of solids

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Hydraulics and Fluid Mechanics in ME
Kinematic similarity is said to exist between the model and the prototype, if both of them

Have identical velocities
Are identical in shape, but differ only in size
Are equal in size and shape
Have identical forces

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