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HEAT TRANSFER

Heat Transfer
For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy

d²T/dZ² > 0
dT/dZ = 0
d²T/dZ² = 0
d²T/dZ² < 0

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Heat Transfer
Among liquids, water has a comparatively high value of thermal conductivity, due to its

Low density
High viscosity
Partial ionisation
Dense structure

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Heat Transfer
Evaporation by thermocompression results in the

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

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Heat Transfer
Which of the following is directly concerned with the heat transfer?

Euler number
Sherwood number
Strouhal number
Grashoff number

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Heat Transfer
Evaporator tubes are generally

Horizontal
Random
Vertical
Inclined

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