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(a) When light waves is falls upon a black and gray body, some part of it is absorbed by the body in the form of heat, reflected back into space, and transmitted through the body. However, the ability of each body for that is varies. Compare the main difference between a black and gray body? (6 Marks) (b) A cylindrical pyrolysis furnace used in palm kernel shell carbonization process having radius and height equal to 1 m respectively (Figure 1). The top (surface 1) and the base (surface 2) of the furnace has emissivities 0.8 and 0.4, respectively, and are maintained at constant temperatures T;= 427 C and Ty= 227 C. The side surface closely approximates a blackbody and is maintained at a temperature of Tz= 127 C. Determine the net rate of radiation heat transfer at each surface during steady operation (15 Marks) T, = 427C &q=0.8 3 H Black T; = 127 C T = 227 C E2 = 0.4 Figure 1 Pyrolysis furnace (c) Explain how these surfaces (b) can be maintained at specified temperatures. (4 Marks)