Fluid Mechanics

341.Minimum porosity for fluidisation is

1. That corresponding to static bed
2. That corresponding to completely fluidised bed
3. The porosity of the bed when true fluidisation begins
4. Less than that of the' static bed

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342.Molten soap mass is transported by a _________ pump.

1. Diaphragm
2. Reciprocating
3. Gear
4. Centrifugal

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343.Momentum correction factor used in fluid flow problems accounts for the

1. Change in direction of flow
2. Change in total energy
3. Change in pressure
4. Non uniform direction of velocities at inlet & outlet sections

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344.Momentum transfer in laminar flow of fluids results due to the

1. Viscosity
2. Density
3. Velocity gradient
4. None of these

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345.Most commonly used joint in the underground pipe lines is the

1. Sleeve joint
2. Coupling
3. Flange
4. Expansion joint

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346.Most of the centrifugal pumps used in chemical plants are usually _________ driven.

1. Steam
2. Diesel engine
3. Electric motor
4. Gas turbine

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347.Multistage centrifugal pumps are generally used for

1. High head
2. Low head but high discharge
3. Highly viscous liquid
4. Slurries of high solid concentration

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348.Multistage compressors are used in industry, because they

1. Reduce the cost of compressor
2. Reduce the size requirement
3. Resemble closely to isothermal compression
4. Are easy to control

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349.N. second/m² is

1. The S.I. unit of dynamic viscosity
2. The S.I. unit of kinematic viscosity
3. Equivalent to one poise
4. Equivalent to one stoke

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350.N²_Re/N_Fr is called the _________ number.

1. Brinkman
2. Galileo
3. Archimedes
4. Euler

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