While the total emissivity of a perfect black body is unity, the same for a real body is__________________?

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In a forward feed multiple effect evaporator, the pressure is ____________________?

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Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?

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Maximum heat transfer rate is achieved in _____________ flow?

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With increase in temperature, the thermal conductivity of a gas ___________________?

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