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Fluid Mechanics

Fluid Mechanics
For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of

>2
43832
2

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Fluid Mechanics
Net positive suction head (NPSH) of a centrifugal pump must be

Less than the vapour pressure of the liquid
Equal to the vapour pressure of the liquid
Less than barometric pressure
Greater than the vapour pressure of the liquid

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Fluid Mechanics
The distance between metacentre and __________ is called metacentric height.

Centre of gravity
Water surface
Centre of buoyancy
None of these

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Fluid Mechanics
As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity)

1/μ
μ
1/μ²
μ²

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Fluid Mechanics
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.

NPSH required
Head of the liquid pumped
BHP required by the pump
All of these

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Fluid Mechanics
In magnetic flow meters, voltage generation is

Proportional to the fluid velocity
Neither A nor B
Both A and B
Due to the motion of conducting fluid through an externally generated uniform field

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