Heat Transfer
With increase in temperature, the thermal conductivity of non-metallic amorphous solids

None of the listed here
decreases
increases
remains same

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Heat Transfer
In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m².s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m²/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is

2000
6000
5000
4000

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Heat Transfer
In a shell and tube heat exchanger,

There is no relationship between temperature drop and resistance
The temperature drop is inversely proportional to the resistance across which the drop occurs
The relationship is not generalised
The temperature drops in the two fluids and the wall are proportional to individual resistances

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