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Exam Document for Semester I, 2007/2008: Biomedical Science M.Sc. Examinations, Exams of Biology

Information about the semester i examinations for the m.sc. In biomedical science program, held in the academic year 2007/2008. Exam codes, modules, instructions, requirements, and questions covering various topics such as materials science, solid mechanics and fluid mechanics, and electrochemistry. Students are required to answer multiple-choice questions and provide diagrams where appropriate.

Typology: Exams

2011/2012

Uploaded on 11/29/2012

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Semester I Examinations 2007/ 2008
Exam Code(s) 1MV1
Exam(s) M.Sc. in Biomedical Science
Module Code(s) BES558
Module(s)
Paper No. 1
Repeat Paper
External Examiner(s)
Internal Examiner(s) Dr. Yuri Rochev, Patrick Fournet
Instructions
:
Answer questions from each Section (Section A: 2
questions, Section B: 2 questions and Section C: 1
question). Use a separate answer book for each Section.
Duration
2 hours
No. of Pages 8 (including cover)
Department(s) National Centre for Biomedical Engineering Science
Course Co-ordinator(s) Dr. Yuri Rochev
Requirements:
MCQ
Handout 1
Statistical/ Log Tables
Cambridge Tables
Graph Paper
Log Graph Paper
Other Materials
pf3
pf4
pf5
pf8

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Semester I Examinations 2007/ 2008

Exam Code(s) 1MV Exam(s) M.Sc. in Biomedical Science

Module Code(s) BES Module(s)

Paper No. 1 Repeat Paper

External Examiner(s) Internal Examiner(s) Dr. Yuri Rochev, Patrick Fournet

Instructions:

Answer questions from each Section (Section A: 2 questions, Section B: 2 questions and Section C: 1 question). Use a separate answer book for each Section.

Duration (^) 2 hours

No. of Pages 8 (including cover) Department(s) National Centre for Biomedical Engineering Science Course Co-ordinator(s) Dr. Yuri Rochev

Requirements : MCQ Handout 1 Statistical/ Log Tables Cambridge Tables Graph Paper Log Graph Paper Other Materials

Section A: Materials – Structure and Properties

Answer all Questions

Note: Use diagrams where appropriate

Question 1. [20 marks]

Give a description of the following chemicals (e.g. inter- and intramolecular bonds) and reasons why these particular elements bond to each other (see Periodic Table for elements’ atomic structure).

Part A. KCl

Part B. C 2 H 4

Part C. H 2 O

Part D. Cgraphite

Question 2. [20 marks]

Part A. Explain the concept of grain formation and its implication on materials properties

Part B. Give an example of a ceramic material and its properties

Part C. Give an example of a polymer and its properties

Part D. Explain the significant difference of nanomaterials in terms of their electronic energy levels

  1. Write down a mathematical definition of the Reynolds number, and explain the meaning of each term.
  2. Name the conservation equations which govern fluid flow.
  3. Name an experimental technique that is used for velocity field measurement of a fluid flow.
  4. What does the Reynolds number tell us about the nature of a particular flow?
  5. What are the differences between laminar and turbulent flow?

Part B

An experimental flow loop is used to test the flow structure downstream of a fully opened mechanical heart valve, see attached figure. A pump drives the test fluid through the heart valve. The pump must maintain a steady flow rate of 2 l/min throughout the experiment. A smooth tube with a constant internal diameter of 15 mm connects the pump to the heart valve. A pump must be selected for the experiment that will maintain the pressure just up stream of the heart valve ( P 2 ) at 102,000 Pa. Calculate the pressure at the pump outlet ( P 1 ) so that the correct flowrate is maintained throughout the experiment.

Useful values:

  • The density of the test fluid is 1060 kg/m^3.
  • The pressure at location 2 ( P 2 ) is 102,000 Pa.
  • The length of tubing between location 1 and location 2 is 4 m.

Pump

Heart valve test region

Location 1

1.5 m

Heart valve

z 2 = 1.5 m

Location 2

z 1 = 0 m

Vertical direction

P 2

  • The elevation of location 2 is 1.5 m (z 2 = 1.5 m).
  • The elevation of the pump outlet is ground level (z 1 = 0 m).
  • Acceleration due to gravity, g, is 9.81 m/s^2.
  • 1 litre = 0.001 m^3.

Modified Bernoulli Equation:

v gz gh T

P

v gz

P

2 2

2 1

2 1

1

  1. Calculate the velocity of the flow in the 15 mm diameter tube. (Hint: Flow rate = cross sectional area x velocity).
  2. Calculate the Reynolds number for the flow at location 2. What does this Reynolds number imply about the nature of the flow?
  3. Using the Moody chart, calculate the friction factor f.
  4. Calculate the total head loss (hT) in the length of tubing between location 1 and location 2 (neglect head losses due to bends in the tubing).
  5. Using the modified Bernoulli equation, calculate the pressure at the pump exit ( P 1 ). Assume the flow is steady and incompressible.
  6. What is meant by the assumption that the flow is steady and incompressible?