Steam turbines, maximum amount of work done?

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pp84
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Steam turbines, maximum amount of work done?

Hi, having a little trouble with this problem, not entierly sure what formula to use, or what value to use for Q.

A steam turbine is operated ith an input temp of 800C and exhaust temp of 150C. What is the maximum amount of work the turbine can do for a given heat input Q? Under what conditions is the maximum achieved?

Thanks in advance
 

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have you tried thinking of the thing as a carnot engine?
 
yeh i have but that would just give me an answer with two undefined variables.

0.6Q=W

in the question it says 'for a given heat input Q' what does that mean exactly, could it mean pick a random value.

Thanks for your reply
 
it means just leave Q in your answer. you've already got it