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Fluid Mechanics

Fluid Mechanics
Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.

Total
Manometric
Static
Friction

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Fluid Mechanics
Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is

5π/2
5π/√2
10√2π
5√2π

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

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

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Fluid Mechanics
For an incompressible fluid, the bulk modulus of elasticity is

5 kg/m³
∞ N/m²
1 N
0 N/m

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Fluid Mechanics
Bernoulli's equation is not applicable, when the flow is

Incompressible
Viscous
Irrotational
All of these

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Fluid Mechanics
The unit of dynamic viscosity in SI unit is

m/N. sec
N/m²
kg/m . sec
m² /sec

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