Three Carnot engines operate in series between a heat source at a temperature `T_(1)` and a heat
Channel: Doubtnut
Date: 2020-01-03

Three Carnot engines operate in series between a heat source at a temperature `T_(1)` and a heat sink at temperature `T_(4)` (see figure). There are two other reservoirs at temperature `T_(2) and T_(3)`, as shown, with `T_(1)gtT_(2)gtT_(3)gtT_(4)`. The three engines are equally efficient if :