Section 39(1)(b) in The Orissa Boiler Operation Engineers' Rules, 2000
(b)Heat transfer as applicable to Boiler Technology, three modes of heat transfer, conductance and resistance, steady and unsteady state of heat transfer, combination of heat transfer mechanism, heat transfer surface arrangement; parallel flow, counter flow, and cross flow, effect of lanes, tube spacing, tube diameters, effect of oil or scales, insulations and heat loss;