Fluid Mechanics

591.The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its

1. Absolute viscosity
2. Ratio of absolute viscosity to density
3. Density
4. Reynolds number

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592.The uniformity of a gas fluidised bed depends upon the _________ of the solid particles.

1. Size
2. Surface properties
3. Both (A) and (B)
4. Neither (A) nor (B)

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593.The unit of bulk modulus of elasticity for a liquid in S.I. unit is

1. N
2. N/m
3. N/m²
4. N/m³

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594.The unit of dynamic viscosity in SI unit is

1. kg/m. sec
2. N/m²
3. m² /sec
4. m/N. sec

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595.The unit of velocity head is

1. ft-lb/sec
2. ft-lb/ft³
3. ft-lB_ƒ/lb
4. ft-lB_ƒ/sec

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596.The value of critical Reynolds number for pipe flow is

1. 1300
2. 10000
3. 100000
4. None of these

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597.The valve commonly used in pipes larger than 2" dia is a

1. Globe valve
2. Plug-cock
3. Gate valve
4. Check valve

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598.The valve used for very remote and accurate control of fluid is a _________ valve.

1. Needle
2. Globe
3. Gate
4. Butterfly

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599.The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost is
P. Inlet pressure
Q. Compressor rpm
R. Delivery pressure
S. Volumetric flow rate at inlet.

1. P, Q and R
2. P and R
3. R and S
4. P, Rand S

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600.The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is

1. Hyperbolic
2. Parabolic
3. Linear
4. None of these

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