Consider the following statements about modification in a gas turbine power plant working on a simple Brayton cycle
1. Incorporation of regeneration process increases specific work output as well as thermal efficiency.
2. Incorporation of regeneration process increases thermal efficiency but specific work output remains uncharged.
3. Incorporation of intercooling process in a multi-stage compression system increases specific work output but the heat input also increases.
4. Incorporation of intercooling process in a multi-stage compression system increases specific work putput, the heat addition remains uncharged.
Which of the above statements are correct?
a. 1 and 3 b. 1 and 4
c. 2 and 3 d. 2 and 4