In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is
A. 22.5 m/sec.
B. 33 m/sec.
C. 40 m/sec.
D. 90 m/sec.
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According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to
A. the weight of the body
B. more than the weight of the body
C. less than the weight of the body
D. weight of the fluid displaced by the body
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The difference of pressure between the inside and outside of a liquid drop is
A. p = T × r
B. p = r T
C. p = 2 r T
D. p = r 2 T
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Fluid is a substance that
A. cannot be subjected to shear forces
B. always expands until it fills any container
C. has the same shear stress.at a point regardless of its motion
D. cannot remain at rest under action of any shear force
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The line of action of the buoyant force acts through the
A. centroid of the volume of fluid vertically above the body
B. center of the volume of floating body
C. center of gravity of any submerged body
D. centriod of the displaced volume of fluid
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A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of
A. 3.75 m
B. 4.0 m
C. 4.2m
D. 4.5m
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An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is
A. 10 m/sec2
B. 9.81 m/sec2
C. 10.2 m/sec2
D. 9.75 m/sec2
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The region between the separation streamline and the boundary surface of the solid body is known as
A. wake
B. drag
C. lift
D. boundary layer
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Steady flow occurs when
A. the direction and magnitude of the velocity 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
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The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is
A. constant over the cross section
B. parabolic distribution across the section
C. zero at the mid plane and varies linearly with distance from mid plane
D. zero at plates and increases linearly to midpoint
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Thee horizontal component of buoyant force is
A. negligible
B. same as buoyant force
C. zero
D. none of the above
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Normal depth in open channel flow is the depth of flow corresponding to
A. steady flow
B. unsteady flow
C. laminar flow
D. uniform flow
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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
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The theoretical value of coefficient of contraction of a sharp edged orifice is
A. 0.611
B. 0.85
C. 0.98
D. 1.00
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The discharge of a liquid of kinematic viscosity 4 cm2 /sec through a 8 cm dia-meter pipe is 3200π cm2 /sec. The type of flow expected is
A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data
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Separation of flow occurs when
A. the pressure intensity reaches a minimum
B. the cross-section of a channel is reduced
C. the boundary layer comes to rest
D. all of the above
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Two dimensional flow occurs when
A. the direction and magnitude of the velocity 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
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Uniform flow occurs when
A. the flow is steady
B. the flow is streamline
C. size and shape of the cross section in a particular length remain constant
D. size and cross section change uniformly along length
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Surface tension has the units of
A. newtons/m2
B. newtons/cm
C. newtons/m
D. newtons
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The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is
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