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Heat Transfer

Heat Transfer
Radiation energy is emitted by all the substances, which are above

0°C
none of the listed here
0°K
100°C

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Heat Transfer
The range of electromagnetic spectrum important in heat transfer by radiation is __________ microns.

100-1000
5-50
0.5-50
0.38-0.78

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Heat Transfer
Black liquor generated during paper manufacture is concentrated in a

single effect evaporator followed by a crystalliser
single effect evaporator
multiple effect evaporators followed by a crystalliser
multiple effect evaporator

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Heat Transfer
Fourier's law applies to the heat transfer by

None of the listed here
conduction
convection
radiation

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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

63.8
77.2
48.7
71.2

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Heat Transfer
The Stefan-Boltzman constant depends on the

Surface
None of these
Medium
Temperature

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