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Fluid Mechanics

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

5 kg/m³
0 N/m
1 N
∞ N/m²

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Fluid Mechanics
The head loss in turbulent flow in a pipe varies

As velocity
As (velocity)²
Inversely as the velocity
Inversely as the square of diameter

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Fluid Mechanics
Cavitation in a centrifugal pump results from

High discharge rate
High discharge velocity
High discharge pressure
Low barometric pressure

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Fluid Mechanics
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is

√(HW/π)
HW/4(H + W)²
HW/2(H + W)²
2HW/(H + W)²

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Fluid Mechanics
A centrifugal pump is called a turbine pump, if it is having a

Vaned diffusion casing
Rotating vaned volute
Turbine type impeller
None of these

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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

Decrease
Increase
Remain unchanged
Data insufficient to predict relative pressure drop

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