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THE BOILERS AND PRESSURE VESSELS ORDINANCE, 2002 QUESTION #4017
Question 1
'Convection' heat transfer in a boiler happens primarily when:
  • Heat travels through the metal wall
  • Hot gases flow over the tube surfaces✔️
  • The sun shines on the boiler
  • Chemicals are added to the water
Correct Answer Explanation
Radiation happens in the furnace; Conduction happens through the tube walls.