If the efficiency of the boiler is 91.2 %, the overall efficiency of the turbine, which includes the Carnot efficiency and its mechanical efficiency, is 46.9 %, and the efficiency of the generator is 98.4 %, what is the efficiency of the total generating unit? (Another 5.0 % needs to be subtracted for other plant losses.)

Net efficiency of generating unit = 42.08 - 5 = 37.08 %

Explanation:

We have given that efficiency of the boiler = 91.2 % = 0.912

Carnot efficiency = 46.9 % = 0.469

Efficiency of generator = 98.4% = 0.984

We have to find the efficiency of total generating unit

For finding the efficiency of total generating unit we have to multiply all the efficiencies

So efficiency of generating unit = 0.912*0.469*0.984 = 0.4208 = 42.08 %

For plant losses we have to subtract 5%

So net efficiency of generating unit = 42.08 - 5 = 37.08 %