3rd Class Power Engineering (3B1) Practice Exam 2026 – Comprehensive Prep

The output rating used when a boiler's steam supply feeds a generator is primarily concerned with the generator rating. This is because the generator's output rating, often expressed in kilowatts (kW) or megawatts (MW), indicates the maximum electrical power that the generator can deliver. When evaluating the compatibility between a boiler and a generator, it is essential to ensure that the steam output from the boiler matches the needs of the generator in terms of pressure and quantity, in order to operate efficiently.

The relationship between steam generation and electrical output is crucial for system design and operational efficiency. Properly sizing the boiler to match the generator rating ensures optimal performance and minimizes the risk of operating issues or inefficiencies. Hence, while factors such as fuel consumption, temperature, and mass flow rate of steam are important considerations in the overall system, the generator rating ultimately dictates how much steam is needed for effective power generation.