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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.

Friction
Manometric
Total
Static

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Fluid Mechanics
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

Q/8
Q/16
Q/4
Q/2

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Fluid Mechanics
Transition from laminar flow to turbulent flow is aided by the

All of these
Surface roughness and curvature (i.e.sharp corners)
Pressure gradient and the compressibility of the flowing medium
Vibration

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Fluid Mechanics
Velocity distribution for flow between two fixed parallel plates

Is zero at the plates and increases linearly to the midplane
Is constant over the entire cross-section
Varies parabolically across the section
None of these

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Fluid Mechanics
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

Δp/2
2Δp
Δp²
Δp

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Fluid Mechanics
The bulk modulus of elasticity of a liquid

Increases with pressure
Decreases with pressure
Is zero for incompressible liquid
Is independent of temperature & pressure

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