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.Management Sciences
Category: Fluid Mechanics
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as__________________?
A. center of gravity
B. center of buoyancy
C. center of pressure
D. metacentre
If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?
A. less than 1
B. between 1 and 100
C. 160
D. 200
If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then_____________?
A. the pressure throughout the liquid mass is atmospheric
B. there will be vacuum in the liquid
C. the pressure in the liquid mass is greater than hydrostatic pressure
D. none of the above
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is__________________?
A. slightly less
B. slightly more
C. nearly half
D. equal
The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid______________?
A. steady flow
B. uniform flow
C. incompressible flow
D. frictionless flow
where pi and p2 are mass densities
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?
A. constant
B. dependent only on Reynolds number
C. a function of Reynolds number and relative roughness
D. dependent on relative roughness only
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is______________?
A. at the centroid of the submerged area
B. always above the centroid of the area
C. always below the centroid of the area
D. none of the above
A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is___________________?
A. zero
B. one-fourth its value when cylinder was full
C. one-half its value when cylinder was full
D. cannot be predicted from the given data
When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies________________?
A. linearly with radial distance
B. as the square of the radial distance
C. inversely as the square of the radial distance
D. inversely as the radial distance
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