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.Management Sciences
Category: Hydraulics and Fluid Mechanics
Practical fluids____________________?
A. are viscous
B. possess surface tension
C. are compressible
D. possess all the above properties
E. possess none of the above properties
The flow which neglects changes in a transverse direction is known as ____________________?
A. one dimensional flow
B. uniform flow
C. steady flow
D. turbulent flow
E. streamline flow
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
A. 10 m/sec
B. 25 m/sec
C. 2 m/sec
D. 50 m/sec
E. 250 m/sec
Mach number is significant in___________________?
A. supersonics, as with projectiles 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 force, and wave making effects, as with ship’s hulls
D. all of fhe above
E. none of the above
A body floats in stable equilibrium________________?
A. when its meatcentric height is zero
B. when the metancentre is above e.g
C. when its e.g. is below it’s center of buoyancy
D. metacentre has nothing to do with position of e.g. for determining stability
E. none of the above
Principle of similitude forms the basis of__________________?
A. comparing two identical equipments
B. designing models so that the result can be converted to prototypes
C. comparing similarity between design and actual equipment
D. hydraulic designs
E. performing acceptance tests
The angle of contact in case of a liquid depends upon____________________?
A. the nature of the liquid and the solid
B. the material which exists above the free surface of the liquid
C. both of die above
D. any one of the above
E. none of die above
The units of kinematic viscosity are_______________?
A. metres2 per sec
B. kg sec/meter
C. newton-sec per meter
D. newton-sec per meter
E. none of the above
The resultant upward pressure of the fluid on an immersed body is called__________________?
A. upthrust
B. buoyancy
C. center of pressure
D. all the above are correct
E. none of above is correct
The tendency of a liquid surface to contract is due to the following property_________________?
A. cohesion
B. adhesion
C. viscosity
D. surface tension
E. elasticity
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