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Fluid Mechanics

Fluid Mechanics
Unit of mass velocity is

Kg/hr
Kg/m³. hr
Kg/m²
Kg/m². hr

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Fluid Mechanics
Low specific speed of a pump implies that, it is a/an __________ pump.

Axial flow
Mixed flow
None of these
Centrifugal

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Fluid Mechanics
Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.)

√d
d4/5
d1/3
d2/3

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Fluid Mechanics
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

V₁ = V₂ = V₃
Q₁ = Q₂ = Q₃
Q = Q₁ + Q₂ + Q₃
F = f₁ + f₂ + f₃

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Fluid Mechanics
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

Data insufficient to predict relative pressure drop
Decrease
Increase
Remain unchanged

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Fluid Mechanics
The hydrodynamic and thermal boundary layers will merge, when

Nusselt number tends to infinity
Schmidt number tends to infinity
Archimedes number is greater than 10000
Prandtl number is one

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