Drawback of steam as working substance in power cycle - Thermodynamics

Q.  What is the drawback of the steam as a working substance in a power cycle?
- Published on 21 Aug 15

a. in a vapour power cycle, maximum temperature which can be obtained with best available material is more than the critical temperature of water and requires large superheating
b. it allows only small amount of heat addition at the highest temperature
c. it requires reheat and reheater tubes are costly
d. all of the above

ANSWER: all of the above

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