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Heat Transfer

Heat Transfer
__________ equation relates the thermal conductivity of a solid to its temperature.

Kistyakowski
Kopp's
Antonie
Lee's

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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

77.2
48.7
63.8
71.2

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Heat Transfer
Forced circulation evaporators are normally used for concentrating liquids having

High viscosity
Scaling characteristics
Both A & B
Neither A nor B

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Heat Transfer
The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

4
43832
2
43834

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr-1
NPr1/3
NPr
NPr-1/3

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Heat Transfer
Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is

Thin walled having the value of Ao Ai/< 2
Both B and C
Thick walled
Having the value of Ao/Ai > 2

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