If Carnot cycle has maximum possible thermal efficiency, then why don’t the steam turbine power plants run on Carnot cycle?

Because the process of heat addition is at constant temperature

As mean temperature of heat addition is quite low in case of Carnot cycle

Since work consumed by compressor is approximately equal to work produced by turbine

Because boiler can’t be maintained at constant pressure in Carnot cycle

Explore topic-wise MCQs in Steam Turbine Questions and Answers.

This section includes 2 Mcqs, each offering curated multiple-choice questions to sharpen your Steam Turbine Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.	In a solar operated steam power plant, water is converted into steam via solar heat. If the effective area of solar plate is 200m2, value of solar constant is 1.362KW per m2, efficiency of solar components is 17% and overall thermal efficiency of steam cycle desired is 12%. Find the turbine power output?
A.	45KW
B.	22.46KW
C.	5.55KW
D.	16.54KW
Answer» D. 16.54KW

Discussion

2.	If Carnot cycle has maximum possible thermal efficiency, then why don’t the steam turbine power plants run on Carnot cycle?
A.	Because the process of heat addition is at constant temperature
B.	As mean temperature of heat addition is quite low in case of Carnot cycle
C.	Since work consumed by compressor is approximately equal to work produced by turbine
D.	Because boiler can’t be maintained at constant pressure in Carnot cycle
Answer» D. Because boiler can’t be maintained at constant pressure in Carnot cycle

Discussion