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 turbocharging? (8)

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

(i) Which area is varied

(ii) Why is it varied

(iii) How is it varied