Heat Transfer
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is

71.2
48.7
63.8
77.2

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Heat Transfer
A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case,

Both B & C
Both will absorb equal amount of radiation from the surrounding in the beginning
Both the spheres will emit equal amount of radiation per unit time in the beginning
The cooling rate will be the same for the two spheres and hence the two spheres will have equal temperatures at any instant

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Heat Transfer
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/m².°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

Greater than that for uninsulated steam pipe
Less than the steam pipe with 5 cms insulation
Equal to that of the uninsulated steam pipe
Less than that of the uninsulated steam pipe

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