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).

Difficulty: Easy

• The ratio of heat actually used in producing the steam to the heat liberated in the furnace
• The amount of water evaporated or steam produced (kg) per kg of fuel burnt
• The amount of water evaporated from and at 100°C into dry saturated steam (without specifying a rate)
• The evaporation of 15.653 kg of water per hour from and at 100°C (one boiler horsepower)
• The net heat rate of the furnace expressed in kJ/min