Exam Question

(a) To improve the power to weight ratio of an engine, it is necessary to increase the MEP. Discuss the importance of turbocharger compression ratio in this regard. Why has it become necessary to introduce two stage turbo charging? (8)

(b) With reference to turbochargers with Variable turbine area, explain: (8)

(i) Which area is varied

(ii) Why is it varied and

(iii) How is it varied?