Project ForgeProcess Calculations
Laws of Thermodynamics
GATE 2020
Medium
Two Carnot engines C1 and C2 operate in series: C1 between reservoirs R1 (800K) and R2, and C2 between R2 and R3. The efficiencies of C1 and C2 are 0.40 and 0.35 respectively. The temperature (K) of reservoir R3 is (round off to nearest integer)
312 K(± 1 accepted)
Explanation
η1=1−R2/R1 ⟹ R2=800×(1−0.40)=480K. η2=1−R3/R2 ⟹ R3=480×(1−0.35)=312K.
Source: GATE CH 2020 (2020)
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