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What is the critical average pressure at which the single boiler unit per turbines is designed to handle?

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What is the critical average pressure at which the single boiler unit per turbines is designed to handle?

(a) 150 bar

(b) 220 bar

(c) 740 bar

(d) 575 bar

This question was addressed to me in exam.

The question is from Function of Boilers topic in portion Steam Generators & Accessories of Energy Engineering

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The correct answer is (b) 220 bar

To explain I would say: Single boiler per unit turbines is designed to operate at average critical temperature of 220bar. If the boilers are designed to operate above or below the critical pressure, than they are known as super critical boilers are once through boilers. If the boilers are designed to operate below the critical pressure than they are known as sub critical or drum boilers.

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