Flow of Fluids Flashcards
A fluid is one which
A. Cannot remain at rest under the action of shear force
B. COntinuously expands till it fills any container
C. Is incompressible
D. Permanently resists distortion
A. Cannot remain at rest under the action of shear force
In an incompressible fluid density
A. Is greatly affected by moderate changes in pressure
B. Is greatly affected only by moderate changes in temperature
C. Remains unaffected with moderate change in temperature and pressure
D. Is sensible to changes in both temperature and pressure
C. Remains unaffected with moderate change in temperature and pressure
Potential flow is the flow of
A. Compressible fluids with shear
B. Compressible fluids with no shear
C. Incompressible fluids with shear
D. Incompressible flds with no shear
D. Incompressible flds with no shear
Potential flow is characterized by
A. Irrotational and frictioless flow
B. Irrotational and frictional flow
C. One in which dissipation of mechanical energy into heat occurs
D. The formation of eddies within the stream
A. Irrotational and frictionless flow
Newton’s law of viscosity relates
A. Shear stress and velocity
B. Velocity gradient and pressure intensity
C. Shear stress and rate of angular deformation in a fluid
D. Pressure gradient and rate of angular deformation
C. Shear stress and rate of angular deformation in a fluid
Dimension of viscosity is
A. M/LT
B. ML/T
C. MLT/T
D. MLT
A. M/LT
Poise is converted into stoke by
A. Multiplying with density (g/cc)
B. Dividing with density (g/cc)
C. Multiplying with specific gravity
D. Dividing with specific gravity
B. Dividing with density (g/cc)
Dimension of kinematic viscosity is
A. M/L²
B. L²/T
C. L²T
D. L²T²
B. L²/T
With increase in the temperature, viscosity of a liquid
A. Increases
B. Decreases
C. Remains constant
D. First decreases and then increases
B. Decreases
For water, when the pressure increases, the viscosity
A. Also increases
B. Decreases
C. Remains constant
D. First decreases and then increases
D. First decreases and then increases
The pressure intensity is the same in all direction at a point in a fluid
A. Only when the fluid is frictioless
B. Only when the fluid is at rest having zero velocity
C. When there is no motion of one fluid layer relative to an adjacent layer
D. Regardless of the motion of one fluid layer relative to an adjacent layer
C. When there is no motion of one fluid layer relative to an adjacent layer
Choose the set of pressure intensities that are equivalent.
A. 4.33 psi, 10 ft H2O, 8.83 inHg
B. 4.33 psi, 10 ft H2O, 20.7 inHg
C. 10 psi, 19.7 ft H2O, 23.3 inHg
D. 10 psi, 19.7 ft H2O, 5.3 inHg
A. 4.33 psi, 10 ft H2O, 8.83 inHg
For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the
A. Square of the radial distance
B. Radial distance linearly
C.Averse of the radial distance
D. Elevation along vertical direction
A. Square of the radial distance
The center of pressure is
A. Always below the centroid of the area
B. Always above the centroid of the arrea
C. A point on the line of action of the resultant force
D. At the centroid of the submerge area
C. A point on he line of action of the resultant force
A rectangular surace 3’ x 4’ has the lower 3 edge horizontal and 6’ below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force in one side of the surace is (y = specific weight of water):
A. 39.6y
B. 48y
C. 49.2y
D. 58y
B. 48y
A stream tube is that which has ______ cross-section entirely bounded by a stream lines.
A. A circular
B. Any convenient
C. A small
D. A large
B. Any convenient
Mass velocity is independent of temperature and pressure when the flow is
A. Unsteady through uncharged corss-section
B. Steady through changing cross-section
C. Steady and the cross-section is unchanged
D. Usteady and the cross-section is changed
C. Steady and the cross-section is unchanged
In turbulent flow,
A. The fluid paricles move in an orderly manner
B. Momentum transfer is on molecular scale only
C. Shear stress is cause more efectively by cohesion than momentum transfer
D. Shear stresses are generally larger than in a similar laminar flow
D. Shear stresses are generally larger than in a similar laminar flow
Turbulent flow generally occurs for cases involving
A. Highly viscous fluid
B. Very narrow passages
C. Very slow motion
D. None of these
D. None of these
An ideal fluid is
A. Frictionless and incompressible
B. One which obeys Newton’s law of viscosity
C. Highly viscous
D None of these
A. Frictionless and incompressible
Steady flow occurs when
A. Conditions change steadily with time
B. Conditios are the same at the adjacent points at any instant
C. Conditions do not change with time at any point
D. Rate of change of velocity is constant
C. Conditions do not change with time at any point
Which of the following must be followed by the flw of fluid (real or ideal)?
I. Newton’s law of viscosity
II. Newton’s second law of motion
III. The continuity equation
IV. Velocity of boundary must be zero relative to boundary
V. Fluid cannot penetrate a boundary
A. I, II, III
B. II, III, V
C. I, II, V
D. II, III, V
B. II, III, V
Discharge (ft³/sec) from a 24-inch pipe of water at 10 ft/sec will be
A. 7.65
B. 32.36
C. 48.22
D.125.6
D. 125.6
The unit velocity head is
A. ft-lb/sec
B. ft-lb/ft³
C. ft-lbf/lbm
D. ft-lbf/sec
C. ft-lbf/lbm