Chemical Engineering · all questions

Fluid Mechanics
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Q361

In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.

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Q362

In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.

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Q363

Which of the following has the maximum compression ratio?

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Q364

Stoke's law is valid, when the particle Reynolds number is

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Q365

U_mf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 U_mf to 2.5 U_mf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the

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Q366

Foot valve provided in the pump is a __________ valve.

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Q367

A Pitot tube indicates 5 cm of water (manometer) when it is being used for measuring velocity of air. The velocity of air in m/sec is

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Q368

For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by

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Q369

In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is

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Q370

Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)

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Q371

The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which "sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis". The centre of pressure of a rectangular surface (of width 'w') immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid)

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Q372

A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.

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Q373

A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is

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Q374

Weber number is the ratio of inertial force to __________ force.

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Q375

One stoke (unit of kinematic viscosity) is equivalent to

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Q376

When the water is warm, the height to which it can be lifted by a pump

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Q377

For a particle settling in water at its terminal settling velocity, which of the following is true?

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Q378

Pick out the correct statement.

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Q379

Pick out the wrong statement.

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Q380

Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f₁ and that for smooth pipe is f₂. Pick out the correct statement.

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