Fluid Mechanics - Chemical Engineering Questions and Answers

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Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter.

Two

Three

Four

Eight

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Momentum correction factor used in fluid flow problems accounts for the

Change in direction of flow

Change in total energy

Change in pressure

Non uniform direction of velocities at inlet & outlet sections

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What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?

0.5

1.5

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What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition?

0.5

0.67

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Deformation drag, which is caused by widespread deformation of fluid around the immersed body

Occurs when N_Re is very small

Is primarily a friction drag

Is independent of body length

Depends mainly on cross-sectional shape

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For an ideal fluid flow, Reynolds number is

2100

100

∞

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For ideally incompressible fluid, the Mach number will be

1.5

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Ratio of pressure and inertia force gives __________ number.

Weber

Mach

Euler

Froude

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Froude number is not a factor

For Reynolds number greater than 300

When there is no vortex formation

For unbaffled tank

None of these