Answer Happy

5. (a) During a thermodynamic cycle gas undergoes three different processes beginning at an initial state where p₁-1.5 bar, V₁ =2.5 m³ and U₁ =61 kJ. The processes are as follows: (i) Process 1-2: Compression with pV= constant to p2 = 3 bar, U₂ = 710 kJ 3 (ii) Process 2-3: W2-3 = 0, Q2-3= -200 kJ, and (iii) Process 3-1: W3-1 = +100 kJ. Determine the heat interactions for processes 1-2 and 3-1 i.e. Q1-2 and Q3-1. (b) A and B are two reversible Carnot engines which are connected in series working between source temperature of 1500 K and sink temperature of 200 K, respectively. Carnot engine A gets 2000 kJ of heat from the source (maintained at temperature of 1500 K) and rejects heat to second Carnot engine i.e. B. Carnot engine B takes the heat rejected by Carnot engine A and rejects heat to the sink maintained at temperature 200 K. Assuming Carnot engines A and B have same thermal efficiencies, determine: a. Amount of heat rejected by Carnot engine B b. Amount of work done by each Carnot engines i.e. A and B c. Assuming Carnot engines A and B producing same amount of work, calculate the amount of heat received by Carnot B and d. Thermal efficiency of Carnot engines A and B, respectively.