As what had been expected, my test 3 result is not very good. It is because I don’t really understand the entropy chapter. When Prof Kamarul started to teach us this chapter, he told to us just accept everything that he would teach to us. I think because of that reason I cannot absorb it very well..huhu..
But the test also includes second law of thermodynamics chapter. For first question I wrongly understood the data given in that question. When I read again the question I realise that it gives the data for QL not QH. Just for that reason I loss about 18 marks. Next problem is question no 3 because it related to entropy chapter. As I told before, I do not understand the whole thing in this chapter. So it become a nightmare for me to answer this question.
For the last question, I was really tricky question. In my opinion, the entropy for the pressure at 20 bar and 15 bar is not the same due to the existing of throttling valve and changes of pressure. But when comparing with the full marks answer, it has the same value of s. This question need a deep understanding of this topics.