Due to the limits, upper efficiency of steam turbines is fixed to
A. 10-15%
B. 25-45%
C. 20-40%
D. 35-45%
Answer:A
Due to the limits, upper efficiency of steam turbines is fixed to
A. 10-15% B. 25-45% C. 20-40% D. 35-45%
Explanation: In steam and gas turbine combined power plants, steam turbines water is used as working medium. High pressure and high temperatures are required for these high pressures which in turn requires high strengths so expensive alloys like nickel and cobalt are used. These limit the upper efficiency to 35-45%.