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

48.7
63.8
77.2
71.2

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Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

Through a metallic wall
By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
By direct contact of hot flue gas with air
None of these

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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

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

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