Download Tripura Bojjawar BIEN 501 Physiological

BIEN 501 Physiological Modeling
April 21, 2004
Q1)What is the primary difference between dynamic viscosity µ and kinematic viscosity
γ?
a) Kinematic viscosity is independent of pressure
b) Dynamic viscosity is independent of pressure
c) Dynamic viscosity is independent of temperature
d) Kinematic viscosity is independent of temperature
Q2)A fluid has absolute viscosity of 0.048Pa s . If at a point A , 75mm from the wall the
velocity is measured as 1.125 m/s, calculate the intensity of shear stress at a point B
50mm from the wall in N/m².Assume a linear (straight line ) velocity distribution from
the wall.
a) 15
b) 0.048
c) 0.72
d) 0.032
Q3)
An
ideal
fluid
is
a
fluid
that
____________________.
a) Compressible and no internal friction
is
__________________
and
has
b) Incompressible and infinite internal friction
c) Incompressible and finite internal friction
d) Incompressible and no internal friction
Q4) Give the physical meaning of ▼. u
a) It represents the value to which the velocity field converges to
b) Represents velocity gradient
c) It is a measure of how much vector field spreads or diverges
d) Both a and b
Q5) If a certain flow field (2D flow) can be determined by a stream function φ , what can
you say about the flow?
a) Its equivalent to saying flow is incompressible
b) Flow is laminar
c) a and b
d) none
Q6) The velocity components of a 2D planar motion of a stream function φ in cylindrical
coordinate system with Vz=0 and no z-dependance are
a) Vr=-1/r dφ/dθ ; Vθ = dφ/dr
b) Vr=-1/r²sinθ dφ/dθ ; Vθ = -1/r²sinθ dφ/dr
c) Vr=1/r dφ/dθ ; Vθ =-1/r dφ/dr
d) None of the above
Q7)The equation below represents momentum flux distribution for steady incompressible
flow in an annulus When κ is made zero it reduces to
Trz = (((P0 – Pl)R)/2L) [(r/R)-((1- κ²)/(2ln(1/ κ))(R/r)]
a) equation of flow for a falling film
b) equation of flow for a circular tube
c) zero
d) none of the above
Q8)The shell balance equations are
a) easy to apply for all types of flow
b) easy to apply to curved streamlines
c) Applicable only to rectilinear flow & curved streamlines
d) Applicable to rectilinear flow and difficult to apply to curved streamlines
Q9)The boundary conmdition for falling film of variable viscosity for steady state(and
neglecting end efforts) are
a) Vz=0 at x= and dVz/dx = 0 at x=0
b) Vz=0 at x=0 and dVz/dx = 0 at x=
c) Vz = Vy = Vx = 0
d) None
Q10)In the Hagen porescuille law problem the assumption that velocity is independent of
axial distance was proved by
a) Principle of conservation of momentum
b) Principle of conservation of mass
c) Equation of motion
d) None
Q11)Which is true of a liquid?
a) its viscosity increases with temperature
b) primary cause of viscosity is momentum transfer by random molecular motion
c) primary cause of viscosity is cohesion between adjacent molecules
d) Its density is much lower than that of gas
Q12)Which of the following is Non-Newtonian?
a) Bingham plastic
b) Blood
c) a and b
d) only b
Q13)For the creeping flow of a solid sphere problem the equation of momentum flux
distribution; pressure distribution and velocity are valid for
a) any flow with Re =1
b) creeping flow; Re=0.1
c) All flows with Re = 0.01
d) Creeping flow with Re=1
Q14)Low Reynold’s flows are also called
a) inviscid flows
b) creeping flows
c) incompressible flows
d) none
Q15)Which of the following is best useful for finding frictional losses
a) couette flow
b) poiseulle’s flow
c) stokes flow
d) none of the above
Q16)The equation Dp/Dt = -(▼.v) represents
a) an increase in density
b) a decrease in density
c) increase or decrease of density along the fluid
d) increase and decrease of density along the fluid
Q17) ▼.vv represents
a) scalar
b) a vector with 9 components
c) a vector with single component
d) none
Q18)Newtons law of viscosity for an incompressible fluid is:  = -mv where v is
symmetrical rate of deformation tensor. The coefficient of viscosity depends on
a)  and v
b) Only 
c)  , Pressure and Temperature
d)  , Pressure and Temperature
Q19)For the tangential annular flow of a Newtonian fluid the 
a) Vt and Vo are zero
b) V and Vz are zero
c) Vr and Vz are zero
d) None
Q20) In the expression T rz= (Po-pl)r/2L for flow through a circular tube P represents
a)The static pressure
b) The static pressure and gravitational force
c) Static and frictional force
d) both b and c