Question 304Steam Plants - Assistant Engineer

The correct answer is D) allow the use of superheated steam in the turbo-generator without pressurizing the larger main steam line. The turbo-generator steam stop is located between the superheater outlet and the main steam stop valve to allow the use of superheated steam in the turbo-generator. This helps maintain the high quality of the steam without having to pressurize the entire main steam line, which would be less efficient. The other options are incorrect because they do not accurately describe the primary purpose of the turbo-generator steam stop valve. Option A is too general, option B does not specifically address the use of superheated steam, and option C refers to a different component (the control desuperheater).