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**1. The efficiency of a cyclic engine is given by the work done by the engine, divided**

by the heat intake from the surroundings. One Carnot engine drives another in series. Draw a schematic diagram of the combined engine and give an expression for the overall efficiency of this arrangement which contains only the efficiencies of the individual engines.

by the heat intake from the surroundings. One Carnot engine drives another in series. Draw a schematic diagram of the combined engine and give an expression for the overall efficiency of this arrangement which contains only the efficiencies of the individual engines.

**3. Hi, I have managed to draw the diagram but am really struggling with the next bit of the question. Let e1, e2 be the efficiencies of engions 1 and 2 respectively and let e be the overall efficiency.**

I know that e[tex]\ 1=w1/Q_H and e2=w2/(Q_h-w1)[/tex] but I am struggling to find e in terms of e1 and e2, please help.I know that e[tex]\ 1=w1/Q_H and e2=w2/(Q_h-w1)[/tex] but I am struggling to find e in terms of e1 and e2, please help.

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