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Heat Transfer

Heat Transfer
Graetz number is given by

kL/mCp
mCp/kL
kμ/mCp
mCp/kμ

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Heat Transfer
Evaporation by thermocompression results in the

Saving of steam
None of these
Both A and B
Realisation of multiple effect economy in a single effect

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Heat Transfer
Prandtl number for most of dry gases is about

0.001
150
0.72
70

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Heat Transfer
With increase in temperature, the thermal conductivity of a gas

May increase or decrease depending on the type of gas
Increases
Decreases
Remains same

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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
71.2
48.7

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Heat Transfer
The purpose of floating head in a heat exchanger is to

Provide support for tubes
Avoid buckling of tubes
Facilitate its lengthening, if needed
Decrease the pressure drop

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