Boiler power (boiler horsepower): choose the correct standard definition used in steam engineering. According to classic practice, boiler ‘‘power’’ is referenced to a fixed rate of evaporation ‘‘from and at 100°C’’ (dry saturated steam). Select the definition that correctly states boiler power (BHP).
Mechanical Engineering
Steam Boilers and Engines
Difficulty: Easy
Choose an option
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AThe ratio of heat actually used in producing the steam to the heat liberated in the furnace
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BThe amount of water evaporated or steam produced (kg) per kg of fuel burnt
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CThe amount of water evaporated from and at 100°C into dry saturated steam (without specifying a rate)
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DThe evaporation of 15.653 kg of water per hour from and at 100°C (one boiler horsepower)
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EThe net heat rate of the furnace expressed in kJ/min
Answer
Correct Answer: The evaporation of 15.653 kg of water per hour from and at 100°C (one boiler horsepower)
Explanation
Concept'Boiler power' in traditional boiler-room practice is referenced to boiler horsepower (BHP). One BHP is defined as the evaporation of 34.5 lb/h (≈ 15.653 kg/h) of water from and at 100°C into dry saturated steam.
Why the other options are not correct
- Option A is the definition of boiler efficiency (useful heat to furnace heat input).
- Option B is the evaporation ratio (kg steam per kg fuel).
- Option C describes equivalent evaporation in general terms, but boiler power requires a rate basis (per hour).
Key takeawayBoiler power is tied to a fixed reference rate of equivalent evaporation: 15.653 kg/h from and at 100°C.