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Fluid Mechanics

Fluid Mechanics
The ratio of inertial forces to gravity forces is called the __________ number.

Euler
Froude
Weber
Mach

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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
Data insufficient to predict relative pressure drop
Increase
Remain unchanged

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Fluid Mechanics
Which of the following is used for very accurate measurement of flow of gas at low velocity?

Hot wire annemometer
Pitot tube
Segmental orificemeter
Rotameter

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Fluid Mechanics
The dimension of kinematic viscosity is

L²T⁻¹
None of these
ML⁻²T⁻²
ML⁻²T⁻¹

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Fluid Mechanics
The most economical flow control valve for use with large diameter pipes is a

Globe valve
Butterfly valve
None of these
Needle valve

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Fluid Mechanics
Prandtl mixing length is

A universal constant
Zero at the pipe wall
Applicable to laminar flow problems
None of these

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