Thermodynamics on Power Plant related Questions and Answers

Question :   If p and q are the efficiencies of a Brayton & Rankine cycles respectively in a Brayton-Rankine combined plant, the efficiency n of a combined plant is? 1. n = p/q 2. n = p+q-pq 3. n = pq 4. n = (1 - pq) Answer :   2 - n = p+q-pq