Make Up Exam. BIEN 501.
1.
Viscosity __________ with Hematocrit (Amount of blood cells in a unit volume).
(a)Increases (b) Decreases (c) Remains the same (d) Is not related (e) None of the above.
2.
Compute the dynamic viscosity in centipoises given the steady state momentum flux, тyx as
1.46x10-2 lbf/ft2, lower plate velocity V as 1 ft/s. in positive x direction plate separation Y is
0.001ft. (1 centipoise=2.0866x10-5 lbf s/ft2.)
(a) 0.5 (b) 0.6 (c) 0.7 (d) 0.8 (e) none of the above.
3.
The dilatational viscosity, k has a value of ______ for monatomic gases at low density.
(a) 0 (b) 1 (c) 2 (d) 3 (e) none of the above.
4.
The convective momentum flux tensor, ρvv has ________ number of scalar components.
(a) 4 (b) 6 (c) 9(d) 12 (e) none of the above.
5.
The boundary condition at the gas liquid interface for a falling film is given by,
(a)x=0, тxx=0 (b) x=0, тxz=0 (c) y=0,тxy=0 (d) y=0, тyy=0 (e) none of the above.
6.
An oil has a kinematic viscosity of 4x10-4 m2/s and density of 0.6x103 kg/m3.What is the
Reynolds Number if the thickness of a falling film is 2mm on a vertical wall and mass rate of flow
w is 3.92x10-2 W.
(a) 0.5 (b) 0.6533 (c) 0.9(d) 0.12 (e) none of the above.
7.
The following are the assumptions made in obtaining Hagen-Poiseuille equation,
(1)Flow is Laminar, Re < 2100
(2)Density is constant
(3)Flow changes with time
(4)The fluid behavior is not valid for very dilute gases.
(a) 1, 2, 3 are true. (b) 2 &4 are true (c) 1&2 only (d) all of the above (e) none of the above.
8.
The Velocity Profile for two immiscible liquids, A & B flowing Laminar Flow between two
parallel plates represents
Liquid A
Liquid B
(a) More Dense, More Viscous in A.(b) Less Dense Less Viscous in A (c) More Dense Less
Viscous in B (d)Equal Densities and Viscosities in both (e)None of the Above
9.
The equation of continuity gives the net addition in mass by __________ transport.
(a) conduction (b) Convection (c) Radiation (d) Both a and b (e) None of the above
10. The rate of momentum addition by molecular transport per unit volume is given by
(a) -  p-  .τ (b) -  p (c) -  .τ (d)  . pvv (e) none of the above
11. In the tangential flow in a cone & plate viscometer, velocity VФ is a function of
(a) r only (b)  only (c) r, Ф,  (d) r &  only (e) none of the above
12. For stream line flow, volumetric rate of flow between the surfaces,  =  1 &  = 2 is
proportional to
(a)  2 (b)  2- 1 (c)  2 +  1 (d) both  2 &  1.
13. The boundary condition for a streamline flow of a Newtonian fluid around a stationary sphere of
radius R
(a) r =R, Vr = - (1/r Sin  )(  /  ) (b) r=0, Vr = - (1/r Sin  )(  /  ) =0
(c) r tends to  V  (d) all the above (e) none of the above
14. Sum of the pressure, kinetic & potential energy per unit volume constant throughout the entire flow
field. This is called
(a) Stokes Flow (b) Euler Equation of Motion (c) Bernoulli Equation (d) All of the above (e)
None of the above
15. The molecular Viscosity of the gas at low density follows the relation:
a) Is directly proportional to the radius of the spherical gas molecule
b) Is proportional to the mass of the spherical gas molecule
c) Is Independent of the diameter of the gas molecule.
d) Both b and c
e) None of these
16. If the gas molecule A has a radius of 1 microns and the other molecule B has a radius of 2 microns,
then the ratio of Viscosities of the molecule follow the relationship. Assume the spherical gas
molecule is at low density.
(a)Viscosity ratio of A to B is 2
(b)Viscosity ratio is 4
(c)Viscosity ratio is 16
(d)Viscosity in independent of radius, hence the ratio is 1
(e)None of these
17. Consider the cylindrical flow pipe. The ratio of the areas at the inlet to that of outlet is
16.Considering the mass balance, and the mass flow rate constant, if the velocity flow at inlet is
2m/sec, then the velocity in m/sec at the outlet will be calculated as:
(a) 64
(b) 32
(c) 8
(d) Data is insufficient
(e) None of these
18. Which of the following is correct?
(a) It is the boundary conditions that determines the solution of the problem in fluid dynamics
(b) Its is the co-ordinate frame that determines the solution
(c ) It is the assumptions on which the entire solution is based
(d) Both a and b
(e)None of these
19. According to Stokes Formula, which is correct?
(a) Force acting is proportional to Viscosity of the fluid
(b) Stokes force is produced by the body on the fluid which is flowing
(c)Stokes Force is proportional to the diameter
(d) Both a and b
(e) None of these
20.
a)
b)
c)
d)
e)
Which of the following describes a Tensor?
A=2i +3j+4k
B=4j
A.B
Both a and c
None of these