Attempt all 3 questions. Answers should be neatly handwritten using pen and pape

Attempt all 3 questions. Answers should be neatly handwritten using pen and paper (or a graphics tablet if you prefer). Please don’t type your solutions. Show all of your working, as partial credit will be given for the correct method even if the final answer is incorrect. Ensure that intermediate answers are not rounded too much. In particular, base transport factor should be calculated to 5 or 6 decimla places to ensure accuracy.
Please make sure your writing is not too small
It is not necessary to produce a perfect manuscriipt. If you make a minor mistake, just score out the mistake and keep going
Please make sure that calculations are clearly set out and fully explained
The use of computer software such as MATLAB is not permitted