Download Newtonian, Non-Newtonian Fluids and Viscosity

Newtonian, Non-Newtonian Fluids and Viscosity
Q.1) Viscosity is a function of:
a.
b.
c.
d.
e.
Temperature and Pressure
Flow rate only
Temperature
Flow rate, Temperature and Pressure
None of the above
Q.2) The difference between dynamic viscosity (  ) and kinematic viscosity ( ) is:
a.
b.
c.
d.
e.
Kinematic viscosity is independent of pressure
Dynamic viscosity is independent of pressure
Dynamic viscosity is independent of temperature
Kinematic viscosity is independent of temperature
None of the above
Q.3) For the figure given below and for the given equation, u = 3y-4y3 calculate the shear stress,
0.15m from the wall if the dynamic viscosity of the fluid is 0.001N.s/m2?
a.
b.
c.
d.
e.
2.73 x 10-3 N
2.73 N/m2
0.273 x 10-3 N/m2
2.73 x 10-3 N/m2
None of the above
Shell Momentum Balance
Q.4) For steady state flow momentum balance is given by,
a.
b.
c.
d.
e.
rate of momentum in
rate of momentum in
rate of momentum in
rate of momentum in
none of the above
- rate of momentum out + sum of forces acting on system = 0
- rate of momentum out = 0
+ rate of momentum out = 0
= - rate of momentum out
Q.5) Momentum balance equation can be applied only when the streamlines of a flow system
are:
a.
b.
c.
d.
e.
Straight lines/rectilinear flow
Tangential flow
Curved Flow
Mixed Flow
none of the above
Laminar Flow and Velocity distributions in Laminar Flow
Q.6) Laminar flow of blood without rippling occurs when Re is;
a.
b.
c.
d.
e.
Re < 1000
Re > 1000
Re < 4 to 25
Re > 10000
none of the above
Q.7) The velocity gradient is maximum when the momentum flux distribution is;
a.
b.
c.
d.
e.
maximum
zero
not related
negative
none of the above
Poiseuille Flow
Q.8) Poiseuille flow is applied when a fluid behaves as a continuum. This is valid assumption
except for flow in;
a.
b.
c.
d.
e.
Arteries
Vein
Very narrow capillary tubes
all of the above
none of the above
Bingham Fluids
Q.9) For Bingham fluid, the velocity gradient is zero when;
a.
b.
c.
d.
e.
momentum flux is zero
momentum flux is less than the yield stress  0
momentum flux is greater than the yield stress 
momentum flux is equal to velocity gradient
none of the above
0
Ideal Fluids
Q.10) Ideal fluids satisfy which of the following properties;
a.
b.
c.
d.
e.
Re =  ,   0 , compressible
Re = 0,   0 , compressible
Re = 0,   0 , incompressible
Re =  ,   0 , incompressible
none of the above
Equation of Continuity
Q.11) Determine whether the velocity component given satisfies the equation of continuity
u = 2x2 + z y
v = -2xy + 3y2 + 3zy
w = -1.5z2 – 2xz – 6yz
Where u, v, w are velocity in any x, y, z direction respectively?
a. true
b. false
Stoke’s Law
Q.12) Applying stokes law for flow around sphere, the boundary conditions considered as
standard are;
a. Velocity becomes zero(no slip conditions),flow is uniform at a infinite distance from the
sphere
b. Velocity increases and flow is uniform at infinite distance from the sphere
c. Velocity decreases and flow turns non-uniform at sphere
d. Velocity remains constant and flow is uniform at sphere surface
e. none of the above
Biomedical Applications in Fluid Mechanics
Q.13) The simplest model for blood flow through a vessel in human circulation is;
a.
b.
c.
d.
e.
Stokes flow model
Womersley flow model
Poiseuille flow model
Euler’s flow model
none of the above
Q.14) Effects of narrowing in segments of an artery that is narrowed (stenosis) due to fatty
deposits, known as, atherosclerosis can be estimated using;
a.
b.
c.
d.
e.
Bernoulli’s Equation
Stokes flow model
Womersley flow equation
Poiseuille flow equation
none of the above
Vector Relationships
Q.15) what is the physical meaning of  .V, divergence velocity component?
a.  .V = volumetric rate of expansion of a differential element of fluid per unit volume of
that element
b.  .V > 0 for expanding gas
c.  .V < 0 for a gas being compressed
d. all of the above
e. none of the above
Euler’s Equation
Q.16) Euler equations describe the following for an ideal compressible inviscid fluid in 3dimension:
a.
b.
c.
d.
e.
conservation of mass
conservation of momentum
conservation of energy
all of the above
none of the above
Q.17) Euler’s equation is expressed as:
Dv / Dt = - p +
Dv / Dt = - p +
Dv / Dt = - p +
Dv / Dt = g +
none of the above
a.
b.
c.
d.
e.
g
g +  2v
 2v
 2v
Partial Derivative Equation
Q.18) For steady state flow which of the following time derivatives cannot be ignored;
a.
b.
c.
d.
e.
partial derivatives
total time derivatives
Substantial time derivatives
all of the above
none of the above
Womersley Number
Q.19) Womersley number is defined by the equation:
a.
b.
c.
d.
e.
inertia force/ viscous force
viscous force/ inertia force
inertiaforce / viscousforce
inertia force x viscous force
none of the above
Special Topics
Q.20) Fluids which exhibit a yield stress and also a non-linear relationship between shear stress
and rate of shear are classified as:
a.
b.
c.
d.
e.
Newtonian fluid
Non-Newtonian fluid
Bingham fluid
Casson’s fluid
none of the above