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2. A reversible composite heat engine operates between three reservoirs at temperatures of 400K, 300K and 200K. One engine operates between the 400K and 300K reservoirs and a second engine operates between the 300K and 200K reservoirs and is synchronised with the first. In one cycle 1200 J of heat is extracted from the 400K reservoir and 100 J of heat is rejected to the 200 K reservoir. a) Draw a schematic diagram of this composite heat engine, labelling the temperatures of the reservoirs, the heat extracted and the work done. [5] b) Calculate the net heat exchanged per cycle with the 300K reservoir and the total work done by the composite engine. [5] c) Find the the entropy change for each reservoir and hence the total entropy change. Is the total entropy change for this reversible engine consistent with the principle of increasing entropy? [5]

          2. A reversible composite heat engine operates between three reservoirs at temperatures of 400K, 300K and 200K. One engine operates between the 400K and 300K reservoirs and a second engine operates between the 300K and 200K reservoirs and is synchronised with the first. In one cycle 1200 J of heat is extracted from the 400K reservoir and 100 J of heat is rejected to the 200 K reservoir.
a) Draw a schematic diagram of this composite heat engine, labelling the temperatures of the reservoirs, the heat extracted and the work done. [5]
b) Calculate the net heat exchanged per cycle with the 300K reservoir and the total work done by the composite engine. [5]
c) Find the the entropy change for each reservoir and hence the total entropy change. Is the total entropy change for this reversible engine consistent with the principle of increasing entropy? [5]

2. A reversible composite heat engine operates between three reservoirs at temperatures of 400K, 300K and 200K. One engine operates between the 400K and 300K reservoirs and a second engine operates between the 300K and 200K reservoirs and is synchronised with the first. In one cycle 1200 J of heat is extracted from the 400K reservoir and 100 J of heat is rejected to the 200 K reservoir.
a) Draw a schematic diagram of this composite heat engine, labelling the temperatures of the reservoirs, the heat extracted and the work done. [5]
b) Calculate the net heat exchanged per cycle with the 300K reservoir and the total work done by the composite engine. [5]
c) Find the the entropy change for each reservoir and hence the total entropy change. Is the total entropy change for this reversible engine consistent with the principle of increasing entropy? [5]

Added by Shannon R.

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