8a) For a fast t-square fire in an atrium with a cross sectional area 500m² and height of 10m, determine the position of the smoke layer interface after 300s. Volumetric entrainment constant is0.065. Sketch the smoke layer is required. (Assume the transport lag of smoke is 30 seconds). b) Define the factors to cause and the precaution methods against dust explosion. (6 marks) (6 marks)

8a) For a fast t-square fire in an atrium with a cross sectional area 500m² and height of 10m, determine the position of the smoke layer interface after 300s. Volumetric entrainment constant is0.065. Sketch the smoke layer is required. (Assume the transport lag of smoke is 30 seconds). b) Define the factors to cause and the precaution methods against dust explosion. (6 marks) (6 marks)