Question

A) What is a spark ignition engine? What is the air standard cycle of such an engine? What are its four processes explain with neat sketch. b) What is a compression ignition engine? Why is the compression ratio of such an Engine more than that of SI engine? Explain with neat sketch. c) Describe the role of thermodynamics in building a sustainable society

Answer 1

[Spark - Ignition engine] Spark - Ignition engine is the petrol engine based on otto cycle through which we generate power mainly used in automobile [Air - standard cycle = otto cycle] (1 - 2) rightarrow Reversible adiabatic compression (2 - 3) rightarrow Constant volume heat addition (3 - 4) rightarrow Reversible Adiabatic expansion (4 - 1) rightarrow Constant volume Heat rejection Compression ignition engine is the diesel engine based on the diesel cycle through which power is generated mainly used in heavy vehicle like truck. To avoid knocking and to increase efficiency we used higher compression potion as can not used in engine as by increasing compression ratio in SI engine knowing tendency increases. Thermo dynamics used many places like in power plant, in various engine pump, compressor which serve to society. r\n (1 - 2) rightarrow Adiabatic compassing. (2 - 3) rightarrow Constant pressure heat addition (3 - 4) rightarrow Reversible Adiabatic expansion (4 - 1) rightarrow Constant volume Heat rejection