Engineering Principles is concerned with the engineering science associated with calculations in engineering. Have a look at the module descriptor and the module guide.

There is 50% for the portfolios and 50% for the end examination. The end examination is closed book. 

There are a number of quizzes at the start of sessions that do count as part of the portfolios. I.e. 40% for the practical portfolio and 10% for your best 5 quizzes.