If the thermal efficiencies of mercury and steam cycles are respectively \eta_1 and \eta_2 , then the overall efficiency of a binary cycle can be expressed as:

Correct Answer is : η1+η2−η1η2

\eta_1 + \eta_2 + \eta_1 \eta_2

\eta_1 + \eta_2 - \eta_1 \eta_2

SSC JE Mechanical Engineering 27 Oct 2020 Shift 2 Papers

Question : 120 of 200

Marks: +1, -0

If the thermal efficiencies of mercury and steam cycles are respectively

η_1

and

η_2

, then the overall efficiency of a binary cycle can be expressed as:

Solution:

Overall efficiency of binary vapour cycle is:

η = 1 -(1 -η_1) (1 -η_2)

η = 1 -(1 -η_2 -η_1 + η_1η_2)

η =  η_1 + η_2 - η_1 η_2

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