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.Management Sciences
Category: Hydraulics and Fluid Mechanics
Reynolds number is significant in____________________?
A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above
E. none of the above
True one-dimensional flow occurs when___________________?
A. the direction and magnitude of the veiocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
E. velocity, depth, pressure etc. change from point to point in the fluid flow
All the terms of energy in Bernoulli’s equation have dimension of_______________?
A. energy
B. work
C. mass
D. length
E. time
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if __________________?
A. the area is horizontal
B. the area is vertical
C. the area is inclined
D. all of the above
E. none of the above
Metacentric height is given as the distance between_______________?
A. the center of gravity of the body andthe meta center
B. the center of gravity of the body and the center of buoyancy
C. the center of gravity of the body and the center of pressure
D. center of buoyancy and metacentre
E. none of the above
Viscosity of water in comparison to mercury is ______________________?
A. higher
B. lower
C. same
D. higher/lower depending on temperature
E. unpredictable.
When a body floating in a liquid, is displaced slightly, it oscillates about ___________________?
A. e.g. of body
B. center of pressure
C. center of buoyancy
D. metacentre
E. liquid surface
The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as_________________?
A. one dimensional flow
B. uniform flow
C. steady flow
D. turbulent flow
E. streamline flow
For pipes, turbulent flow occurs when Reynolds number is_________________?
A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000
E. none of the above
According to Bernoulli’s equation for steady ideal fluid flow_______________?
A. principle of conservation of mass holds
B. velocity and pressure are inversely proportional
C. total energy is constant throughout
D. the energy is constant along a stream-line but may vary across streamlines
E. none of the above
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