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(a) In a two-stage carnot heat engine, a quantity of heat | Q 1 | is absorbed at a temperature T 1 , work | W 1 | is done, and a quantity of heat |Q 2 | is expelled at a lower temperature T 2 , by the first stage. The second stage absorbs the heat expelled by the first, does work |W 2 |, and expels a quantity of heat |Q 3 | at a lower temperature T 3 .prove that the efficiency of the combination is (T 1 – T 3 )/T 1 . (b) A combination mercury steam turbine takes saturated mercury vapour from a boiler at 469ºC and exhausts it to a condenser at 37.8ºC. Calculate the maximum efficiency of the combination.

(a) In a two-stage carnot heat engine, a quantity of heat | Q1 | is absorbed at a temperature T1 , work | W1 | is done, and a quantity of heat |Q2| is expelled at a lower temperature T2, by the first stage. The second stage absorbs the heat expelled by the          first, does work |W2|, and expels  a quantity of heat |Q3| at a lower temperature T3 .prove that the efficiency of the combination is (T1 – T3)/T1 . (b) A combination mercury steam turbine takes saturated mercury vapour from a boiler at 469ºC and exhausts it to a condenser at 37.8ºC. Calculate the maximum efficiency of the combination.

Grade:upto college level

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