Question

If the efficiencies of the boiler, turbine and generator are 85%, 45% and 95% respectively, then the efficiency of the power plant is
1. 75%
2. 45%
3. 36.3%
4. 28.7%

Answer 1

Correct Answer - Option 3 : 36.3%

Concept:

Overall efficiency of the power plant is equal to the multiplication of the efficiencies of boiler, turbine and generator.

ηpower plant = ηboiler × ηturbine × ηgenerator

Calculation:

Boiler efficiency = 85%

Electrical generator efficiency = 95%

Turbine efficiency = 45%

Overall efficiency of the plant = (0.85) (0.95) (0.45) = 0.3633

Overall efficiency of the plant = 36.33%.