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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is

1
0.25
None of these
0.5

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Hydraulics and Fluid Mechanics in ME
The specific speed (Ns) of a centrifugal pump is given by

(N√Q)/H3/4
(N√Q)/H2/3
(N√Q)/H5/4
(N√Q)/H

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Hydraulics and Fluid Mechanics in ME
A turbine develops 10000 kW under a head of 25 meters at 135 r.p.m. Its specific speed is

175.4 r.p.m.
215.5 r.p.m.
241.5 r.p.m.
275.4 r.p.m

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Hydraulics and Fluid Mechanics in ME
A balloon lifting in air follows the following principle

law of gravitation
principle of buoyancy
Archimedes principle
All of these

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

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Hydraulics and Fluid Mechanics in ME
The cavitation in a hydraulic machine

All of these
Causes noise and vibration of various parts
Causes sudden drop in power output and efficiency
Reduces the discharge of a turbine

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