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Chemical Engineering Objective Questions { Fluid Mechanics }



610. The continuity equation
A. Is independent of the compressibility of the fluid
B. Is dependent upon the viscosity of the fluid
C. Represents the conservation of mass
D. None of these
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611. The friction factor is
A. Always inversely proportional to the Reynolds number
B. Not dimensionless
C. Not dependent on the roughness of the pipe
D. None of these
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612. The lift of a ballon is
A. Increased, as it rises to a higher altitude
B. Due to the weight of the atmospheric air, that it displaces
C. Not dependent on the temperature of the atmosphere
D. None of these
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613. The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.
A. Inlet tip of a blade curves in a direction opposite to that
B. Outlet tip of a blade curves in a direction opposite to that
C. Inlet tip of a blade is towards the direction
D. Outlet tip of a blade is towards the direction
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614. A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now
A. Increase
B. Decrease
C. Remain same
D. Data insufficient to predict
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615. The Prandtl mixing length is
A. Zero at the pipe wall and is a universal constant
B. Independent of radial distance from the pipe axis
C. Independent of the shear stress
D. Useful for computing laminar flow problems
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616. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the
A. Back flow of fluid in the event of stoppage of pump
B. Discharge pressure
C. Flow of liquid during operation of the pump
D. All of the above
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