3. Answer the following questions relating to heat engines: a) Describe and illustrate in detail the...

 

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3. Answer the following questions relating to heat engines: a) Describe and illustrate in detail the complete Otto cycle including all the thermodynamic processes involved. Include the pV diagram. Show how we can calculate the efficiency of an Otto cycle engine. (10 Marks) PAR b) The Otto-cycle 2000 cc engine in a Proton Perdana car has a compression ratio r = 9.5. What is the efficiency of this engine? The 1600 cc engine in Proton Iriz car on the other hand has a compression ratio r= 12.5. How much increase in the ideal efficiency of the Iriz compared to the Perdana? The Iriz is 15% more expensive whereas the Perdana offers 20% more torque. Which one would be a more economical choice? Justify your answer. (it is given that y = 1.40) (5 Marks) c) A Carnot engine takes 1800 J of heat from a reservoir at 600 K, does some work, and discards some heat to another reservoir at 250 K. How much work does it do, how much heat is discarded, and what is the efficiency? (3 marks) d) Find the total entropy change in the engine in question c) for one cycle. (2 marks) Qu 3. Answer the following questions relating to heat engines: a) Describe and illustrate in detail the complete Otto cycle including all the thermodynamic processes involved. Include the pV diagram. Show how we can calculate the efficiency of an Otto cycle engine. (10 Marks) PAR b) The Otto-cycle 2000 cc engine in a Proton Perdana car has a compression ratio r = 9.5. What is the efficiency of this engine? The 1600 cc engine in Proton Iriz car on the other hand has a compression ratio r= 12.5. How much increase in the ideal efficiency of the Iriz compared to the Perdana? The Iriz is 15% more expensive whereas the Perdana offers 20% more torque. Which one would be a more economical choice? Justify your answer. (it is given that y = 1.40) (5 Marks) c) A Carnot engine takes 1800 J of heat from a reservoir at 600 K, does some work, and discards some heat to another reservoir at 250 K. How much work does it do, how much heat is discarded, and what is the efficiency? (3 marks) d) Find the total entropy change in the engine in question c) for one cycle. (2 marks) Qu

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Cycle which is mainly used It is a Constant volume in petiel engine PV and TS and Ts diagram are ... View the full answer