A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

• A. greater than that for uninsulated steam pipe.
• B. less than that of the uninsulated steam pipe.
• C. equal to that of the uninsulated steam pipe.
• D. less than the steam pipe with 5 cms insulation.