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Boiler rating is usually defined in terms of:

  • A.Maximum temperature of steam in Kelvin
  • B.Heat transfer rate in kJ/hr
  • C.Heat transfer area in meter\(^{2}\)
  • D.Steam output in kg/hr

Answer: D

Boiler rating is usually defined in terms of steam output in kg/hr.

A boiler's capacity is stated as the mass of steam it generates per hour, often as equivalent evaporation from and at 100 °C, which makes boilers working at different conditions comparable.

Steam temperature, heat transfer rate and heating area all affect performance, but none of them is the standard rating.

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