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

63.8
77.2
71.2
48.7

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Heat Transfer
Nusselt number is the ratio of the

None of these
Temperature difference to the temperature gradient at the wall
Temperature gradient of the wall to that across the entire pipe
Heat flux at the wall to that across the entire pipe

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Heat Transfer
In the equation Q = UAΔt; Δt is

Arithmetic mean temperature difference
The difference of average bulk temperatures of hot and cold fluids
Logarithmic mean temperature difference
Geometric mean temperature difference

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