Fluid Mechanics for Chemical MCQs

724 MCQs — Chemical Engineering MCQs (Page 35 of 73)

Attempt Fluid Mechanics for Chemical Quiz

Water hammer in a pipeline results from the____________________?

A. Bursting of pipelines due to closure by a valve
B. Rapid pressure change due to a rapid change in the rate of flow
C. Pressure increase due to closure of a valve resulting in decrease in rate of flow
D. None of these

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Kinetic energy of fluid per unit weight represented by the velocity head is given by___________________?

A. 2v2/gc
B. V2/2gc
C. Ρv2/gc
D. Ρ.v2/2gc

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If the discharge of a centrifugal pump is throttled, then its suction lift_______________________?

A. Increases
B. Decreases
C. Remains unchanged
D. Data insufficient to predict

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With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids__________________?

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease; depends on the magnitude of shear rate

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A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke’s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?

A. Same as that of a
B. One fourth as that of a
C. Twice as that of a
D. Four times as that of a

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A piezometer opening measures the _____________ fluid pressure?

A. Static
B. Undisturbed
C. Total
D. Dynamic

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The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?

A. 24000
B. 24
C. 0.24
D. 0.44

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For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is___________________?

A. More
B. Less
C. Equal
D. Either a. or b.; depends on the viscosity of the fluid

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Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be _____________________ ft?

A. 40
B. 34
C. 8
D. 37

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The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to _______________ in Stoke’s law regime?

A. 1
B. 0.5
C. 2
D. 1.5

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