Fluid Mechanics - Chemical Engineering Questions and Answers

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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.

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If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

Q = Q₁ + Q₂ + Q₃

V₁ = V₂ = V₃

Q₁ = Q₂ = Q₃

f = f1 + f₂ + f₃

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Horsepower requirement for given pump capacity depends upon the

specific gravity of the liquid

suction lift

discharge head

all (a), (b) and (c)

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Bernoulli's equation accounts for the

various momentums

various masses

different forms of mechanical energy

none of these

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__________ pumps are a group of vacuum pumps.

Hyter

Sump

Mono

Submerged

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Plunger pumps are used for

higher pressure

slurries

viscous mass

none of these

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What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ?

0.5

1.5

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In turbulent flow, the

fluid particles move in an orderly manner.

momentum transfer is on molecular scale only.

shear stress is caused more effectively by cohesion than momentum transfer.

shear stresses are generally larger than in a similar laminar flow.

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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.