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What is the efficiency of a typical steam power plant?

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Answer & Explanation

Correct AnswerB. 30-40%

Quick Explanation

A conventional steam power plant typically converts roughly 30–40% of fuel heat into electrical output, depending on steam conditions, reheat/regeneration and plant technology. The rest is rejected mainly in the condenser and stack.

Formula / Key Relation

η_plant = Electrical energy output / Fuel heat input ×100%

Detailed Explanation

Concept & Reasoning

The Rankine cycle is constrained by thermodynamic temperature limits and practical component losses. Modern supercritical units can exceed older subcritical values, but the exam's typical range 30–40% is the appropriate conventional figure among the options.

How to Solve It in the Exam

Conventional steam thermal plant → roughly one-third efficiency.

Important Exam Point

Do not confuse boiler efficiency with overall station efficiency.

Related Revision Path

This question sits in the revision path Power Plant Engineering → Steam Power Plants → Efficiency .

Typical Thermal Efficiency explanatory diagram

Quick Trick

Conventional steam thermal plant → roughly one-third efficiency.

Common Mistake

Choosing 70–80%, which is far beyond typical standalone steam-cycle electrical efficiency.

Exam Tip

Do not confuse boiler efficiency with overall station efficiency.

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Exam Path

Knowledge Path

Study concept · Typical Thermal Efficiency →Practice concept Practice topic

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