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(a) What condition needs to be satisfied for the turbine to generate the maximum possible power?

I said process must be isentropic and reversible (ie ignore the heat loss as this is insignificant)

(b)Calculate the specific entropy of the steam leaving the turbine when the latter is generating the maximum possible power.

I said the entropy must reman constant(ie isentropic), and then used my steam table for superheated vapour at 10 bar = 1 Mpa and entropy 6.8802kJ/kgK, I get a final temperature of 239.35 degrees celcius (ie 512.5K)

BUT!!! the next questions says show the exit steam temp = 199.9 degrees C.

COULD SOMEONE please give me some hints at how to do it if you cant choose isentropic???...or mayb point out where I may be missing something???

Thanks guys