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.Management Sciences
Category: Fluid Mechanics for Chemical
The hydrodynamic and thermal boundary layers will merge, when ____________________?
A. Prandtl number is one
B. Schmidt number tends to infinity
C. Nusselt number tends to infinity
D. Archimedes number is greater than 10000
Gradually varying fluid flow is an example of ____________ flow?
A. Non-steady uniform
B. Non-steady non-uniform
C. Steady uniform
D. Steady non-uniform
In a dry packed bed, the pressure drop will be changed by increasing the flow rate as__________________?
A. V1.8
B. V-0.8
C. V
D. V-1
Pick out the correct statement pertaining to Venturimeter ?
A. A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically
downward, than when the flow is vertically upward
B. The co-efficient of contraction of a Venturimeter is always unity
C. For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when
compressibility is taken into account, than when it is neglected
D. None of these
Centrifugal compressors compared to reciprocating compressors__________________?
A. Require less space
B. Have quieter operation
C. Have lower operating costs
D. All A., B. and C.
Pick out the wrong statement?
A. Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer
B. Blowers develop a maximum pressure of 2 atmospheres
C. Friction losses in pipe fittings are generally expressed in terms of velocity heads
D. Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative
roughness & Reynolds number
Mass velocity is independent of temperature & pressure, when the flow is______________________?
A. Unsteady through unchanged cross-section
B. Steady through changing cross-section
C. Steady and the cross-section is unchanged
D. Unsteady and the cross-section is changed
A relief valve__________________?
A. Provides back pressure for a cylinder
B. Unloads a pump
C. Is a directional control valve
D. None of these
What causes cavitation in centrifugal pump ?
A. High suction pressure
B. Low barometric pressure
C. Low suction pressure
D. High suction velocity
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