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Which classification could be used to describe a fire tube boiler?

  1. Low mass

  2. High mass

  3. Middle mass

  4. No mass

The correct answer is: High mass

A fire tube boiler can be classified as a high mass boiler because it typically has a heavier and thicker structure compared to other types of boilers. This extra mass helps to increase the durability and efficiency of the boiler, making it suitable for use in industrial and commercial settings. Classifying it as a low mass, middle mass, or no mass boiler would not accurately describe its physical characteristics or capabilities.